In the following questions, Statement of assertion (A) is followed by a statement of reason (R). 1. If both assertion and reason are true and the reason is the correct explanation of the assertion, then mark. 2. If both assertion and reason are true but the reason is not the correct explanation of the assertion, then mark. 3. If assertion is true statement but reason is false, then mark. 4. If both assertion and reason are false statements then mark.
Assertion: In a food chain members of successive higher levels are fewer in number. Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.A) 1
B) 2
C) 3
D) 4
Correct Answer: D
Solution :
Each food chain contains many steps like producers, herbivores, primary carnivores and so on. Each step of the food chain is called trophic level. Number of organisms at any trophic level depends upon the availability of food. In grassland ecosystem the maximum number of organisms are found in lower trophic level but in forest ecosystem and parasitic food chain it is reverse.
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