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Which of the following statements is NOT correct? (a) Fibrin helps in blood clotting. (b) Platelets stop bleeding; many platelets reach the…
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Which one of the following is an incorrect food chain? (a) Grass → Rabbit → Snake → Hawk (b) Grass → Grasshopper…
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Which of the following is not an example of mutualism? (a) Man and intestinal bacteria (b) Water hyacinth and fish (c) Fish…
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In which of the following crosses, will the F1 generation seed’s tall and dwarf traits appear in a 1:1 ratio? (a) Tt…
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What will be the phenotypic ratio of progeny obtained from the hybridization between YyRR and YYrr genotypes? (a) 2:1 (b) 1:2 (c)…
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If a population undergoes three generations, and if each generation consists of only males, what is the probability that females will be…
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Which of the following statements about self-pollination is correct? Self-pollination occurs within the same flower. New characters do not arise by self-pollination.…
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Among nitrobacter, rhizobium, nitrosomonas, nitrite bacteria, pseudomonas — which one is found in the fourth phase of the nitrogen cycle? (a) Rhizobium…
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The smallest unit of an ecosystem containing both biotic and abiotic factors is— (a) A green leaf (b) A flowering branch (c)…
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Which one of the following is the best example of convergent evolution and similarity due to it? (a) Wing structure of bat…
