| Consider the following statements. |
| 1. The amount of energy at each trophic level in proportion to the next trophic level is called as primary productivity. |
| 2. The maximum number of links in any food chain is four or five. |
| 3. Every population thrives in an optimal range of abiotic factors. Beyond this range, one finds less and less numbers of these organisms. This range is called ecological range. |
| Which of the statement(s) given above is/are correct? |
A) 1 and 2
B) 2 and 3
C) Only 3
D) Only 2
Correct Answer: B
Solution :
[b] Primary productivity is the rate, at which an ecosystem's producers create biomass. The amount of energy at each trophic level in proportion to the next trophic level is called as ecological efficiency. 10 % rule, say that only about 10 % of the energy available to one trophic level gets transferred to the next trophic level. Most food chains have no more than four or five links. There cannot be too many links in a single food chain, because the animals at the end of the chain would not get enough food to stay alive. Every population thrives in an optimal range of abiotic factors. This range is called tolerance range. Within the range of tolerance in each ecosystem population are able to adjust to variations in its physical and chemical environment.
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