Question

Read the following statements.
I. In a food chain, there is a multidirectional flow of energy from the sun to producers, consumers, and decomposers.
II. Shorter food chains provide more energy as compared to longer food chains.
III. In an ecosystem, no food chain is independent.
IV. The energy available at each successive trophic level increases.
Which of these statements are correct?

• A. I and II
• B. II and III
• C. III and IV
• D. I and IV

Answer 1

Answer: (B)

II and III

• In ecology, a food chain is a series of organisms that eat one another so that energy and nutrients flow from one to the next. It starts with the autotrophs who can prepare their own food by using sunlight and carbon dioxide from the atmosphere. They form the base of all the food chains. There is a unidirectional flow of energy from the sun to producers, consumers, and decomposers.
• All food chains are interconnected and form the food web. A food web with intersecting food chains represents the different things an organism can eat and be eaten by.
• Energy transfer at each successive trophic level decreases as there is a loss of energy at each level. Therefore, short chains provide more energy than longer chains.

Thus, the correct option is B.