Question

how do food chain get shortened? how can this shortening affect the biosphere?

Answer 1

undesirable activities of man eliminate  the growth of organisms belonging to one or more trophic levels in a food chain. Thus, Food chains gets shortened.
For example :
1.Hunting tigers for their skin
2. Plants---Deer---Tiger
3. Deforestation
If man cuts down the trees for their commercial needs then deers which are dependent on trees get less food and also less amount of oxygen will released in the atmosphere where all living organism are dependent on O2. if deers become less in number due to lack of food, tiger become less in number . Thus the indirect activities of human beings leads to imbalance in ecosystem and biosphere. If organisms of one trophic level are eliminated, the organisms prior to that trophic level will flourish and increase in number and also the organisms of the subsequent trophic level will sharply decrease, therby creating an imbalance.

Answer 2

of organisms belonging to one or more trophic levels in a food chain. Thus, the food chain gets shortened, e.g. hunting tigers for their skin, etc. It causes imbalance in the functioning of the ecosystem and biosphere. ... Vegetarian food chain gives ten times more energy than the non-vegetarian food chain.

of organisms belonging to one or more trophic levels in a food chain. Thus, the food chain gets shortened, e.g. hunting tigers for their skin, etc. It causes imbalance in the functioning of the ecosystem and biosphere. ... Vegetarian food chain gives ten times more energy than the non-vegetarian food chain.

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