English Medium Class 10 - CBSE Question Bank Solutions

What will be the amount of energy available to the organisms of the 2nd trophic level of a food chain if the energy available at the first trophic level is 10,000 joules?

Which of the following are always at the second tropic level of food chains?

State with reason any two possible consequences of elimination of decomposers from the Earth.

"Energy flow in a food chain is unidirectional" Justify this statement.

In a food chain of frog, grass, insect and snake, assign trophic level to frog.

Give reason to justify the following: The existence of decomposers is essential in a biosphere.

Give reason to justify the following: Flow of energy in a food chain is unidirectional.

List two biotic components of a biosphere.

Why are green plants called producers?

The first trophic level in a food chain is always a green plant. Why ?

List two main components of ecosystem?

We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.

List two important roles play in the environment by decomposers.

"Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues." State the reason to explain how and why it happens?

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

Which of the following constitute a food-chain?

What will happen if we kill all the organisms in one trophic level?

Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?

What is biological magnification?

In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?

Plants → Deer → Lion