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Explain Why a Progressive Decline is Seen in the Population Size from the First to the Fourth Trophic Level in the Above Pyramid. - Biology

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Explain why a progressive decline is seen in the population size from the first to the fourth trophic level in the above pyramid.

 

 
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Solution

In the above example, the primary producers can support less number of primary consumers, which in turn support lesser number of secondary and tertiary consumers. In a food chain, as the size of an organism at any trophic level increases, its number decreases. This happens because according to the 10% law, only 10% of the energy is transferred from one trophic level to the next. So in order to sustain life, the number of organisms keeps decreasing at each trophic level. Thus, there is a progressive decline in the population size from the first to the fourth trophic level in the above pyramid.

Concept: Energy Flow in an Ecosystem
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