Question

Give reasons for the following statements: (1) Flow of energy is unidirectional. (ii) Food chains generally consist of only three or four steps. (iii) Some substances are bio degradable and some non-Biodegradable​

Answer 1

Answer:

Food chains

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Answer 2

Answer: 1 ) In a food chain, the energy moves progressively through the various trophic levels' It is no longer available to the previous level  and the energy captured by the autotrophs does not go back to the solar input so  the flow of energy is unidirectional.

2) Since so little energy is available for the next level of consumers, and for this reason food chains generally consist of only three or four steps. The loss of energy at each step is so  that very little usable energy remains after four trophic levels.

3)  The main reason of a substance being biodegradable is being organic that can be used up by scavengers of environment. On the other hand some substances are non biodegradable because they are synthetic and cannot be decomposed by the microorganism.

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