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Best of luck!!  GED Practice Test - Science - Zoology Facts  Average Score for this quiz: 30%  No of times this quiz has been taken: 24  No of people passing this quiz: 9  No of people failing this quiz: 15  Maximum score for this quiz: 69% Coverage : The GEd Practice Test - Science - Chemistry has been designed to test the concepts of the test taker in one of the main branches of science, namely Chemistry. This test covers topics like, structure of matter, compounds and equations, periodicity of elements, behavior of matter etc. 1.  Place the stages of Prophase I in the correct order. a. Diakinesis, Diplotene, Leptotene, Pachytene, Zygotene b. Diplotene, Leptotene, Achytene, Zygotene, Diakinesis c. Leptotene, Pachytene, Diakinesis, Diplotene, Zygotene d. Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis   2.  Which organ acts as a filter against foreign organisms that infect the blood, and also filters out old R.B.C from the blood? a. Spleen b. Lungs c. Stomach d. Brain   3.  Hormones are produced in which gland of animals? a. Exocrine b. Endocrine c. Pituitary d. Hypothallamus   4.  Glands whose secretions pass into a system of ducts that lead ultimately to the exterior of the body are called_________. a. Exocrine b. Endocrine c. Pituitary d. Hypothallamus   5.  In meiosis, the daughter cell have: a. No nucleus b. Doubled the number of chromosomes as the parent cell   c. The same number of chromosomes as the parent cell d. Half the number of chromosomes as the parent cell   6.  Which of the following is a biotic factor? a. Tree b. Temperature c. Sunlight d. Den   This question is based upon the figure shown below 7.  What kind of organisms are found in the neritic zone? a. Penguins b. Elephants c. Mangrooves d. Corals   This question is based upon the figure shown below 8.  What is the junction between two nerve cells called? a. Neuromuscular junction b. Neural junction c. Gap junction d. Synapse   9.  Neurons that conduct nerve impulses from different body parts to the central nervous system are called__________. a. Motor neurons b. Sensory neurons c. Synapses d. Efferent neurons   10.  Which of the following is NOT a part of the digestive system? a. Liver b. Spleen c. Pancreas d. Tendons   11.  A person with Type AB blood has a. A antibodies in the plasma. b. B antibodies in the plasma. c. Both antibodies in the plasma. d. No antibodies in the plasma.   12.  Pelvic Girdle consists of which of the following bones? a. Scapula and clavicle b. Sternum and Scapula c. Ilium, Ischium and Pubis d. Ilium, Ischium and Scapula     This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 13.  Which of the following is not found in a DNA? a. Adenine b. Guanine c. Cytosine d. Uracil     This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 14.  According to the base pairing rules, thymine binds with: a. Adenine b. Guanine c. Cytosine d. Uracil   This question is based upon the figure shown below   This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 15.  What is the above diagram called? a. Punnett Square b. Check Square c. Big Square d. Burnett Square     This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 16.  What do A and B represent in the above diagram? a. Genetic contributions of the offspring b. Genetic contributions of the parents c. Phenotypic contributions of the parents d. Phenotypic contributions of the offspring     This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 17.  What is the heritable change in the genetic material called? a. Implantation b. Partition c. Base pairing d. Mutation     This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 18.  An interbreeding group of organisms is called__________ a. Ecosystem b. Biome c. Population d. Community     This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 19.  From the following, which basic laws are applied in an ecosystem? a. Energy can't be created or destroyed b. Any transfers of energy are not 100% efficient c. For every action there is an equal and opposite reaction d. A body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.     This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 20.  Which substance in very small quantities, catalyzes and controls the natural chemical reactions of metabolism? a. Hormone b. Enzyme c. Vitamin d. Biofertilizer       This Question is based on the following passage:   DNA is a polymer. The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group. There are four different types of nucleotides found in DNA, differing only in the nitrogenous base. Adenine and guanine are purines. Purines are the larger of the two types of bases found in DNA. Cytosine and thymine are pyrimidines. DNA is a normally double stranded macromolecule. RNA is single stranded. Two polynucleotide chains, held together by weak thermodynamic forces, form a DNA molecule. The DNA backbone is a polymer with an alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups in ester links, also known as "phosphodiester" bonds. 21.  Corals thrive in: a. Temperature of 18 degree centigrade and above b. Depth of less than 45 meters c. Salt water of normal salinities d. All of the above     This Question is based on the following passage:   In animals, a substance is released by an endocrine gland into the blood stream, which carries it to remote sites in the body. This substance is called a hormone. Hormones in animals coordinate body functions by being produced in one place and acting in another. Insulin is a protein hormone of vertebrates. It affects the amount of glucose in the blood. It is secreted by the B- cells of islets of Langerhans. An endocrine gland which is attached to the floor of the brain of all craniate vertebrates and which is responsible for a number of hormones is called the pituitary gland. Thyroid is an endocrine gland of vertebrates. It secrets iodine containing hormones (thyroxine and thyroglobulin). A trace of iodine in the diet is necessary to supply the thyroid and. 22.  Which glands secrete hormones into the blood? a. Exocrine b. Endocrine c. Both endocrine and exocrine d. Stomach     This Question is based on the following passage:   In animals, a substance is released by an endocrine gland into the blood stream, which carries it to remote sites in the body. This substance is called a hormone. Hormones in animals coordinate body functions by being produced in one place and acting in another. Insulin is a protein hormone of vertebrates. It affects the amount of glucose in the blood. It is secreted by the B- cells of islets of Langerhans. An endocrine gland which is attached to the floor of the brain of all craniate vertebrates and which is responsible for a number of hormones is called the pituitary gland. Thyroid is an endocrine gland of vertebrates. It secrets iodine containing hormones (thyroxine and thyroglobulin). A trace of iodine in the diet is necessary to supply the thyroid and. 23.  Where are the B- cells of islets of Langerhans which secrete insulin located? a. Stomach b. Liver c. Pancreas d. Gall Bladder     This Question is based on the following passage:   In animals, a substance is released by an endocrine gland into the blood stream, which carries it to remote sites in the body. This substance is called a hormone. Hormones in animals coordinate body functions by being produced in one place and acting in another. Insulin is a protein hormone of vertebrates. It affects the amount of glucose in the blood. It is secreted by the B- cells of islets of Langerhans. An endocrine gland which is attached to the floor of the brain of all craniate vertebrates and which is responsible for a number of hormones is called the pituitary gland. Thyroid is an endocrine gland of vertebrates. It secrets iodine containing hormones (thyroxine and thyroglobulin). A trace of iodine in the diet is necessary to supply the thyroid and. 24.  Deficiency of iodine causes enlargement of the thyroid. What is the medical term for the disease? a. Scurvy b. Beriberi c. Rickets d. Goitre     This Question is based on the following passage:   Blood is a liquid tissue. Suspended in the watery plasma are seven types of cells and their fragments. They are red blood cells (RBCs) or erythrocytes, platelets or thrombocytes, and 5 types of white blood cells (WBCs) or leukocytes. Thus RBCs are terminally differentiated; that is, they can never divide. They live about 120 days and then are ingested by phagocytic cells in the liver and spleen. Most of the iron in their hemoglobin is reclaimed for reuse. White blood cells have nuclei. They participate in protecting the body from infection. Platelets are cell fragments produced from mega-karyocytes. They help in blood clotting. 25.  Minute circular discs floating in the blood which carry oxygen to the tissues and carbondioxide away from them are called _______. a. White blood corpuscles(WBC) b. Red blood corpuscles(RBC) c. Monophylls d. Erythrocytes     This Question is based on the following passage:   Blood is a liquid tissue. Suspended in the watery plasma are seven types of cells and their fragments. They are red blood cells (RBCs) or erythrocytes, platelets or thrombocytes, and 5 types of white blood cells (WBCs) or leukocytes. Thus RBCs are terminally differentiated; that is, they can never divide. They live about 120 days and then are ingested by phagocytic cells in the liver and spleen. Most of the iron in their hemoglobin is reclaimed for reuse. White blood cells have nuclei. They participate in protecting the body from infection. Platelets are cell fragments produced from mega-karyocytes. They help in blood clotting. 26.  Which of the following blood cell are non nucleated? a. RBC b. WBC c. Platelets d. Thrombocytes     This Question is based on the following passage:   Blood is a liquid tissue. Suspended in the watery plasma are seven types of cells and their fragments. They are red blood cells (RBCs) or erythrocytes, platelets or thrombocytes, and 5 types of white blood cells (WBCs) or leukocytes. Thus RBCs are terminally differentiated; that is, they can never divide. They live about 120 days and then are ingested by phagocytic cells in the liver and spleen. Most of the iron in their hemoglobin is reclaimed for reuse. White blood cells have nuclei. They participate in protecting the body from infection. Platelets are cell fragments produced from mega-karyocytes. They help in blood clotting. 27.  The substances existing in blood either naturally or through deliberate  immunization procedures, which counteract bacteria or their poisons in the system are called___________. a. Antibiotics b. Antibodies c. Albumin d. Antigen     This Question is based on the following passage:   Penicillin, the "wonder drug" obtained from a fungus (penicilium notatum) was discovered while studying the bacterium Staphylococcus. 28.  Who discovered penicillin? a. Alexander Fleming b. Karl Landsteiner c. Charles Darwin d. Alfred Nobel     This Question is based on the following passage:   Even though all human blood looks same but it has certain differences which are not visible to the naked eye. These differences are due to presence or absence of certain proteins (antigens) on the red blood cells. On the basis of these antigens human blood can be classified into various groups. The most common blood group system is the ABO system discovered in 1900 by Karl Landsteiner. Depending on the presence or absence of the two antigens called A and B, this system divides the human blood into four groups namely A, B, AB, O. In 1940, Landsteiner and Weiner discovered another antigen called the Rh factor. Most human bear the Rh factor on the surface of their red blood cells and are said to be Rh positive. 29.  Where are the blood antigens located? a. Plasma b. On the white blood cells c. On the red blood cells d. Muscular Fibres     This Question is based on the following passage:   Even though all human blood looks same but it has certain differences which are not visible to the naked eye. These differences are due to presence or absence of certain proteins (antigens) on the red blood cells. On the basis of these antigens human blood can be classified into various groups. The most common blood group system is the ABO system discovered in 1900 by Karl Landsteiner. Depending on the presence or absence of the two antigens called A and B, this system divides the human blood into four groups namely A, B, AB, O. In 1940, Landsteiner and Weiner discovered another antigen called the Rh factor. Most human bear the Rh factor on the surface of their red blood cells and are said to be Rh positive. 30.  To which blood type does a person belong having both antigens of A and B? a. A b. B c. O d. AB     This Question is based on the following passage:    Living organisms (e.g. some bacteria and fungi, glow-worms and many marine animals) produces the creations of light of various colors. Luminescence is produced by a biochemical reaction, which is catalyzed by an enzyme. In some animals the light is used as a mating signal; in others it may be a protective device. In deep-sea forms luminous organs may serve as lanterns. 31.  The production of light of various colors by living organisms is called ______. a. Thermoluminiscence b. Bioluminiscence c. Luminiscence d. Lighting     This Question is based on the following passage:    Living organisms (e.g. some bacteria and fungi, glow-worms and many marine animals) produces the creations of light of various colors. Luminescence is produced by a biochemical reaction, which is catalyzed by an enzyme. In some animals the light is used as a mating signal; in others it may be a protective device. In deep-sea forms luminous organs may serve as lanterns. 32.  How is the light produced in living organisms? a. By a biochemical reaction b. By a photochemical reaction c. By an organ of the body d. By the food eaten     This Question is based on the following passage:    Living organisms (e.g. some bacteria and fungi, glow-worms and many marine animals) produces the creations of light of various colors. Luminescence is produced by a biochemical reaction, which is catalyzed by an enzyme. In some animals the light is used as a mating signal; in others it may be a protective device. In deep-sea forms luminous organs may serve as lanterns. 33.  How is the light used in fireflies? a. Communication b. To attract food c. As a mating signal d. As self defense     This Question is based on the following passage:   It would be interesting to know just how the vertebrate heart evolved from the simple, two-chambered organ of early fish to the complex, multi-chambered hearts of birds and mammals, with their two atria and two ventricles. The heart found in most fish today is a relatively simple organ, with one atrium, from which blood flows into a single ventricle. After leaving the heart, blood picks up oxygen at the gills, but by the time the blood returns to the heart, most of its oxygen is gone. In the heart of modern frogs and toads, the beginnings of distinct ventricular chambers are visible. Although these animals have only one ventricle, its spongy walls help separate oxygenated and deoxygenated blood: oxygen-rich blood flowing in from the left atrium tends to get soaked up by the left ventricular wall; oxygen-poor blood from the right atrium is taken up by the right wall. When the amphibian ventricle contracts, it expels all the blood into a central artery, where the two flows are again kept largely separate by a long winding valve that spirals down the length of the artery, functionally dividing it into two channels. Most of the poorly oxygenated blood travels through the channel that leads toward the lungs and skin, where it picks up a fresh supply of oxygen. (in amphibians, the skin also functions as a gas-exchange organ) 34.  In fishes, which organ  helps in gaseous exchange? a. Mouth b. Gizzard c. Liver d. Gills     This Question is based on the following passage:   It would be interesting to know just how the vertebrate heart evolved from the simple, two-chambered organ of early fish to the complex, multi-chambered hearts of birds and mammals, with their two atria and two ventricles. The heart found in most fish today is a relatively simple organ, with one atrium, from which blood flows into a single ventricle. After leaving the heart, blood picks up oxygen at the gills, but by the time the blood returns to the heart, most of its oxygen is gone. In the heart of modern frogs and toads, the beginnings of distinct ventricular chambers are visible. Although these animals have only one ventricle, its spongy walls help separate oxygenated and deoxygenated blood: oxygen-rich blood flowing in from the left atrium tends to get soaked up by the left ventricular wall; oxygen-poor blood from the right atrium is taken up by the right wall. When the amphibian ventricle contracts, it expels all the blood into a central artery, where the two flows are again kept largely separate by a long winding valve that spirals down the length of the artery, functionally dividing it into two channels. Most of the poorly oxygenated blood travels through the channel that leads toward the lungs and skin, where it picks up a fresh supply of oxygen. (in amphibians, the skin also functions as a gas-exchange organ) 35.  How many ventricles are present in an amphibian? a. One b. Two c. Three d. Four     This Question is based on the following passage:   It would be interesting to know just how the vertebrate heart evolved from the simple, two-chambered organ of early fish to the complex, multi-chambered hearts of birds and mammals, with their two atria and two ventricles. The heart found in most fish today is a relatively simple organ, with one atrium, from which blood flows into a single ventricle. After leaving the heart, blood picks up oxygen at the gills, but by the time the blood returns to the heart, most of its oxygen is gone. In the heart of modern frogs and toads, the beginnings of distinct ventricular chambers are visible. Although these animals have only one ventricle, its spongy walls help separate oxygenated and deoxygenated blood: oxygen-rich blood flowing in from the left atrium tends to get soaked up by the left ventricular wall; oxygen-poor blood from the right atrium is taken up by the right wall. When the amphibian ventricle contracts, it expels all the blood into a central artery, where the two flows are again kept largely separate by a long winding valve that spirals down the length of the artery, functionally dividing it into two channels. Most of the poorly oxygenated blood travels through the channel that leads toward the lungs and skin, where it picks up a fresh supply of oxygen. (in amphibians, the skin also functions as a gas-exchange organ) 36.  In amphibians, which organ also helps in gaseous exchange?   a. Heart b. Nostrils c. Skin d. Liver     This Question is based on the following passage:   The immune system is a complex organ, which is highly specialized cells and a circulatory system separated from blood vessels. The organs of the immune system, positioned throughout the body, are called lymphoid organs. The word "lymph" in Greek means a pure, clear stream. Lymphatic vessels and lymph nodes are the parts of the special circulatory system that carries lymph, a transparent fluid containing white blood cells, chiefly lymphocytes. Lymph bathes the tissues of the body, and the lymphatic vessels collect and move it eventually back into the blood circulation. Lymph nodes dot the network of lymphatic vessels and provide meeting grounds for the immune system cells that defend against invaders. The spleen, at the upper left of the abdomen, is also a staging ground and a place where immune system cells confront foreign microbes. Pockets of lymphoid tissue are in many other locations throughout the body, such as the bone marrow and thymus. Tonsils, adenoids, Peyer's patches, and the appendix are also lymphoid tissues. Both immune cells and foreign molecules enter the lymph nodes via blood vessels or lymphatic vessels. All immune cells exit the lymphatic system and eventually return to the bloodstream. Once in the bloodstream, lymphocytes are transported to tissues throughout the body, where they act as sentries on the lookout for foreign antigens. 37.  Which of the following groups of organs are also lymphoid tissues? a. Tonsils, Adenoids, Peyer's patches, Appendix b. Tonsils, Adenoids, Stomach, Appendix c. Tonsils, Tongue, Peyer's patches, Appendix d. Tonsils, Adenoids, Peyer's patches, Liver     This Question is based on the following passage:   The immune system is a complex organ, which is highly specialized cells and a circulatory system separated from blood vessels. The organs of the immune system, positioned throughout the body, are called lymphoid organs. The word "lymph" in Greek means a pure, clear stream. Lymphatic vessels and lymph nodes are the parts of the special circulatory system that carries lymph, a transparent fluid containing white blood cells, chiefly lymphocytes. Lymph bathes the tissues of the body, and the lymphatic vessels collect and move it eventually back into the blood circulation. Lymph nodes dot the network of lymphatic vessels and provide meeting grounds for the immune system cells that defend against invaders. The spleen, at the upper left of the abdomen, is also a staging ground and a place where immune system cells confront foreign microbes. Pockets of lymphoid tissue are in many other locations throughout the body, such as the bone marrow and thymus. Tonsils, adenoids, Peyer's patches, and the appendix are also lymphoid tissues. Both immune cells and foreign molecules enter the lymph nodes via blood vessels or lymphatic vessels. All immune cells exit the lymphatic system and eventually return to the bloodstream. Once in the bloodstream, lymphocytes are transported to tissues throughout the body, where they act as sentries on the lookout for foreign antigens. 38.  The organs of the immune system, positioned throughout the body, are called________. a. Circulatory system b. Gizzard c. Metazoic d. Lymphoid organs     This Question is based on the following passage:   The immune system is a complex organ, which is highly specialized cells and a circulatory system separated from blood vessels. The organs of the immune system, positioned throughout the body, are called lymphoid organs. The word "lymph" in Greek means a pure, clear stream. Lymphatic vessels and lymph nodes are the parts of the special circulatory system that carries lymph, a transparent fluid containing white blood cells, chiefly lymphocytes. Lymph bathes the tissues of the body, and the lymphatic vessels collect and move it eventually back into the blood circulation. Lymph nodes dot the network of lymphatic vessels and provide meeting grounds for the immune system cells that defend against invaders. The spleen, at the upper left of the abdomen, is also a staging ground and a place where immune system cells confront foreign microbes. Pockets of lymphoid tissue are in many other locations throughout the body, such as the bone marrow and thymus. Tonsils, adenoids, Peyer's patches, and the appendix are also lymphoid tissues. Both immune cells and foreign molecules enter the lymph nodes via blood vessels or lymphatic vessels. All immune cells exit the lymphatic system and eventually return to the bloodstream. Once in the bloodstream, lymphocytes are transported to tissues throughout the body, where they act as sentries on the lookout for foreign antigens. 39.  How do the immune cells and foreign molecules enter the lymph nodes? a. Via Blood vessels b. Via Lymphatic vessels c. Via Digestive system d. None of the above     This Question is based on the following passage:   Penguins are designed for life in the sea. Some species spend as much as 75% of their lives in the water. They lay their eggs and raise their chicks on land. Heavy, solid bones act like a diver's weight belt, allowing them to stay underwater. Their wings, shaped like flippers, help them "fly" underwater at a speed up to 15 mph. A streamlined body, paddle-like feet, insulating blubber, and watertight feathers all add to their efficiency and comfort underwater. They also have a remarkable deep-diving ability. In addition to blubber for insulating warmth, penguins have stiff, tightly packed feathers that overlap to provide waterproofing. They coat their feathers with oil from a gland near the tail to increase impermeability. Black and white counter-shading makes them nearly invisible to predators from above and below. 40.  Penguins belong to which of the following groups? a. Fish b. Amphibians c. Birds d. Mammals     This Question is based on the following passage:   Penguins are designed for life in the sea. Some species spend as much as 75% of their lives in the water. They lay their eggs and raise their chicks on land. Heavy, solid bones act like a diver's weight belt, allowing them to stay underwater. Their wings, shaped like flippers, help them "fly" underwater at a speed up to 15 mph. A streamlined body, paddle-like feet, insulating blubber, and watertight feathers all add to their efficiency and comfort underwater. They also have a remarkable deep-diving ability. In addition to blubber for insulating warmth, penguins have stiff, tightly packed feathers that overlap to provide waterproofing. They coat their feathers with oil from a gland near the tail to increase impermeability. Black and white counter-shading makes them nearly invisible to predators from above and below. 41.  The stiff, tightly packed feathers that overlap provides the penguins with______. a. Warmth b. Water proofing c. Weight d. Helps to swim underwater     This Question is based on the following passage:   Penguins are designed for life in the sea. Some species spend as much as 75% of their lives in the water. They lay their eggs and raise their chicks on land. Heavy, solid bones act like a diver's weight belt, allowing them to stay underwater. Their wings, shaped like flippers, help them "fly" underwater at a speed up to 15 mph. A streamlined body, paddle-like feet, insulating blubber, and watertight feathers all add to their efficiency and comfort underwater. They also have a remarkable deep-diving ability. In addition to blubber for insulating warmth, penguins have stiff, tightly packed feathers that overlap to provide waterproofing. They coat their feathers with oil from a gland near the tail to increase impermeability. Black and white counter-shading makes them nearly invisible to predators from above and below. 42.  How does the black and white counter-shading of the penguins help them? a. Helps them in deep diving b. Helps them float c. Keeps them warm d. Makes them invisible to predators     This Question is based on the following passage:   Recent studies suggest that traces of persistent chemicals may cause permanent changes in children, resulting in lower IQ levels, attention deficits and other behavioral problems. Researchers say this new data marks a paradigm shift in the way toxic chemicals may be regulated, as scientists begin linking broad human health effects to small doses of chemicals in the environment. Eating organic food may help to better promote cellular health since several agricultural chemicals used in the conventional growing of foods have been shown to have a negative effect on mitochondrial function. Several chemicals including paraquat, parathion, dinoseb, and 2-4-D have been found to increase cell membrane permeability exposing the mitochondria to damaging free radicals, inhibiting a process known as coupling that is integral to the efficient production of adenosine triphospate (ATP). ATP is an important cellular chemical that bonds at nerve terminals for normal neural communication. The low levels of cellular ATP at nerve terminals may lead to the loss of synapses and synaptic function, and may ultimately lead to cognitive decline. A child's developing nervous system is more at risk than an adult's. 43.  What are the foods grown without the use of various chemical pesticides called? a. Organic Food b. Country Food c. Free food d. Supplements     This Question is based on the following passage:   Recent studies suggest that traces of persistent chemicals may cause permanent changes in children, resulting in lower IQ levels, attention deficits and other behavioral problems. Researchers say this new data marks a paradigm shift in the way toxic chemicals may be regulated, as scientists begin linking broad human health effects to small doses of chemicals in the environment. Eating organic food may help to better promote cellular health since several agricultural chemicals used in the conventional growing of foods have been shown to have a negative effect on mitochondrial function. Several chemicals including paraquat, parathion, dinoseb, and 2-4-D have been found to increase cell membrane permeability exposing the mitochondria to damaging free radicals, inhibiting a process known as coupling that is integral to the efficient production of adenosine triphospate (ATP). ATP is an important cellular chemical that bonds at nerve terminals for normal neural communication. The low levels of cellular ATP at nerve terminals may lead to the loss of synapses and synaptic function, and may ultimately lead to cognitive decline. A child's developing nervous system is more at risk than an adult's. 44.  Which chemicals have been found to increase cell membrane permeability? a. Paraquat b. Parathion c. Dinoseb d. 2-4-D     This Question is based on the following passage:   Recent studies suggest that traces of persistent chemicals may cause permanent changes in children, resulting in lower IQ levels, attention deficits and other behavioral problems. Researchers say this new data marks a paradigm shift in the way toxic chemicals may be regulated, as scientists begin linking broad human health effects to small doses of chemicals in the environment. Eating organic food may help to better promote cellular health since several agricultural chemicals used in the conventional growing of foods have been shown to have a negative effect on mitochondrial function. Several chemicals including paraquat, parathion, dinoseb, and 2-4-D have been found to increase cell membrane permeability exposing the mitochondria to damaging free radicals, inhibiting a process known as coupling that is integral to the efficient production of adenosine triphospate (ATP). ATP is an important cellular chemical that bonds at nerve terminals for normal neural communication. The low levels of cellular ATP at nerve terminals may lead to the loss of synapses and synaptic function, and may ultimately lead to cognitive decline. A child's developing nervous system is more at risk than an adult's. 45.  A low levels of cellular ATP at nerve terminals may lead to which of the following problems? a. Mental disorder b. Loss of synapses and synaptic function c. Downs Syndrome d. Klienfelters syndrome     This Question is based on the following passage:   Recent studies suggest that traces of persistent chemicals may cause permanent changes in children, resulting in lower IQ levels, attention deficits and other behavioral problems. Researchers say this new data marks a paradigm shift in the way toxic chemicals may be regulated, as scientists begin linking broad human health effects to small doses of chemicals in the environment. Eating organic food may help to better promote cellular health since several agricultural chemicals used in the conventional growing of foods have been shown to have a negative effect on mitochondrial function. Several chemicals including paraquat, parathion, dinoseb, and 2-4-D have been found to increase cell membrane permeability exposing the mitochondria to damaging free radicals, inhibiting a process known as coupling that is integral to the efficient production of adenosine triphospate (ATP). ATP is an important cellular chemical that bonds at nerve terminals for normal neural communication. The low levels of cellular ATP at nerve terminals may lead to the loss of synapses and synaptic function, and may ultimately lead to cognitive decline. A child's developing nervous system is more at risk than an adult's. 46.  Which of the following processes would contribute to an increase in the population size? a. Birth b. Death c. Immigration d. Emigration     This Question is based on the following passage:   During the development of an animal, cells differentiate so they can perform specific functions. Groups of cells with similar specializations to form a common function are referred to as a tissue. Organs are groups of several tissues that function together. Examples of organs include kidneys, spleen, liver, heart, lungs. An organ system, also called a body system, is a group of organs that work together to perform a function. 47.  Choose the correct order. a. Cells, tissues, organ system, organs b. Organ system, cells, tissues, organs, c. Cells, tissues, organs, organ system d. Cells, tissues, organs, organ system     This Question is based on the following passage:   During the development of an animal, cells differentiate so they can perform specific functions. Groups of cells with similar specializations to form a common function are referred to as a tissue. Organs are groups of several tissues that function together. Examples of organs include kidneys, spleen, liver, heart, lungs. An organ system, also called a body system, is a group of organs that work together to perform a function. 48.  A group of organs that work together to perform a function is called a________. a. Tissues b. Tissue system c. Organ System d. Organ   Think you know more about this quiz!   Please enter your Name and what you would like to tell everyone about GED Practice Test - Science - Zoology  Name: Think you know more about GED Practice Test - Science - Zoology and would like others to know too? Whether its a great fact, a joke, a personal experience or an interesting anecdote, please share it with all the human beings on planet earth. Your contribution will help keep QuizMoz a free site for all.    (Optional)  (average submission size - 5 to 10 lines) What others think about GED Practice Test - Science - Zoology By: Himanshu garg on Sep 30, 2008    Students who are preparing for comptetive examination they should give test on net so that they can get new questions and confidence.so this is the site where you can judge yourself.   Home     About Us      Advertise     Terms of Service     Privacy Policy     Contact QuizMoz    FAQ     SiteMap Copyright © 2007.www.quizmoz.com. All rights are reserved.