Question

Which of the following is correct about a food chain and food web?
A. A food chain is a series of organisms feeding on one another. A food web consists of a number of interlinked food chains.
B. A food chain is each step or level of a trophic level. A food web consists of a number of interlinked food chains.
C. A food chain is a series of animals feeding on one another. A food web consists of a number of interlinked trophic levels.
D. A food chain consists of a number of interlinked food webs. A food web consists of a series of organisms feeding on one another.

Answer 1

Hint: Food chain is defined as a linear path, in which an organism gets its food. Usually, it begins with plants and ends with animals. When food chains are networked, it is called food web. Food web contains all the food chains present in a single ecosystem. However, each living thing present in an ecosystem can be part of multiple food chains. As nutrients and energy move through the ecosystem, the food chain is a possible path they may take. Food web is made up of all the overlapping and interconnected food chains in an ecosystem.

Complete answer
Food chain is known as the transfer of food energy from green plants through a series of organisms. In a food chain, each organism occurs at a different trophic level. There is only ten percent of energy passing from one level into the next level. The chain contains producers, which are plants and they produce foods. Chain also contains consumers, which are animals and they eat foods from producers.
Option A. A food chain is a series of organisms feeding on one another. A food web consists of a number of interlinked food chains: This is the apt answer.
Option A is correct
Option B. A food chain is each step or level of a trophic level. A food web consists of a number of interlinked food chains: Food chain is not a step or level.
Hence, Option B is not correct
Option C. A food chain is a series of animals feeding on one another. A food web consists of a number of interlinked trophic levels: Food chain not only involves animals, but also plants.
So, Option C is not correct
Option D. A food chain consists of a number of interlinked food webs. A food web consists of series of organisms feeding on one another: Food web is a interlinked food chain
Option D is not correct

So, Option A is the correct answer

Note:
Primary producers accumulate at the base of the food chain. They are autotrophic and doing photosynthesis like cyanobacteria, algae and plants. Primary consumers eat plants and are mainly herbivores. Primary consumers are eaten by secondary consumers and are carnivores. Tertiary consumers eat secondary consumers. Quaternary consumers eat tertiary consumers and form the apex of the food chain. Example of food chain is: grass-> grasshopper-> frog-> snake-> eagle.