Question

Assertion :Trophic levels are formed by only plants. Reason: Food chains and webs are formed due to linked organisms on basis of their nutrition.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is D Assertion is incorrect but Reason is correct

A food chain or a food web starts from the primary producers like plants which is the trophic level 1. The second trophic level consists of herbivores. The third trophic level has carnivores which are higher organisms. The last trophic level constitutes predators. The food chains are a one-way flow of energy while the food web is directed in all directions. The trophic level of all species varies depending upon the type of ecosystem. The energy is transferred from one trophic level to another in a food chain. The lowest trophic level will have the highest amount of energy in comparison to the higher trophic level. The producers are the organism which produces their own food while the consumers are dependent on them for nutrition. So, trophic levels are formed by organisms linked in the food chain whereas food chains and food webs are formed due to linked organisms on basis of their nutrition.
So, the correct option is D.