Question

Which of the following is false about food chain?

• A. Grazing food chain is major conduit of energy for aquatic ecosystem.
• B. In terrestrial ecosystem, large fraction of energy flows through detritus food chain.
• C. Primary consumers belong to first trophic level.
• D. Detritus food chain begins with dead organic matter.
• E. Cockroaches and crows are omnivores.

Answer 1

Answer: (C)

Primary consumers belong to first trophic level.

There are two types of food chains, namely grazing food chain and detritus food chain. Grazing food chain starts with producer followed by herbivores followed by primary carnivore and secondary carnivore. It ends with decomposers. It is the major conduit of energy for aquatic ecosystem. Producers occupy the first trophic level. The primary consumers occupy the second trophic level. The secondary consumers occupy the third trophic level. Detritus food chain starts with dead organic matter and goes to detrivores. In terrestrial ecosystem, large fraction of energy flows through detritus food chain. Omnivores are organisms that feed on plants as well as animals. Examples includes cockroaches, crows, humans.

Thus, the correct answer is 'Primary consumers belong to first trophic level..'