Question

Explain the significance of food chain in an ecosystem.

Answer 1

All living things need to feed to get energy to grow, move and reproduce. But what do these living things feed on? Smaller insects feed on green plants, and bigger animals feed on smaller ones and so on. This feeding relationship in an ecosystem is called a food chain. Food chains are usually in a sequence, with an arrow used to show the flow of energy.Food chains describe the feeding relationship between the organisms of an ecosystem. The flow of energy from one species to another at various biotic levels forms a food chain. The successive levels in the food chains of a community are called as trophic levels. Various trophic levels in a food chain include producers, primary consumers, secondary consumers and tertiary consumers.

*Food chain helps in studying feeding relationships between organisms.
*Food chain also helps us to know how much energy we gain by consuming which food.
*Food chain helps us to know energy flow from one trophic level to another trophic level.

A food chain is not the same as a food web. 
A food web is a network of many food chains and is more complex. 
See the food web illustration below—you can pick out a basic food chain from the web: Green plants Grasshopper Frog Bird Hawk

Energy transfer:
Energy is transferred along food chains from one level to the next. Some of the energy is used up in growth, reproduction repair, movement and other ways, and not made available to the next level. 

Shorter food chains retain more energy than longer chains. Used up energy is absorbed by the environment.

Answer 2

The food chain is a series of transmission of energy in the form of food when one organism is consumed by the other.

Explanation:

• The food chain is very important for the ecosystem. The majority of life forms are dependent on the producers.
• The producers are responsible for the production of energy at the lower trophic levels.
• The energy from the producers is transferred to the consumers when these producers are eaten by the consumers.
• The population of the producers must be more than that of the consumers so as to feed them better.
• The balance in the ecosystem at the population level is maintained by the predator prey relationship.
• The prey population is eaten by the predator population this helps to regulate the overgrowing population of prey. Thus this can be said that food chain plays an important role in management of the species population in an ecosystem.

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