English Medium कक्षा १० - CBSE Question Bank Solutions for Science

A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y

Name one phytoplankton.

A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y

Name two zooplanktons.

A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y

What could be X?

A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y

Name the organism which Y could be.

A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y

Which organism in the above food chain is a (1) primary consumer, and (2) tertiary consumer?

Some hunters are roaming in the plush green forest of Africa. They spot a deer and kill it. They decide to roast the deer there and then and eat it. When the hunters had just finished enjoying the feast of roasted deer, a lion attacks them. The lion kills one of the hunters and eats his flesh.
(a) write a food chain which provides food to lion in this case.
(b) Which animal (other than deer) the lion could look for food if he did not get the hunter as prey?
(c) Which other animal in the forest could have been in place of lion?
(d) How does the above food chain differ form the food chain such as : plants → goat → man?

What would happen to the number of rabbits and grass plants if the number of foxes increased?

What would happen to the number of rabbits and grass plants if the number of foxes decreased?

What would happen to the number of grass plants and foxes if the number of rabbits increased?

What would happen to the number of grass plants and foxes if the number of rabbits decreased?

Match the terms given in column I with the terms given in column II and column III having the same meaning :

Give one example of a food chain having four organisms. Below each organism write the three appropriate terms from the part (a) above which you think it represents.

Write the percentage of energy transferred from autotrophs to the next level in a food chain.

Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.

In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?

If a harmful chemical enters a food chain comprising cat, mice and plants, which one of these organisms is likely to have the maximum concentration of the harmful chemical in its body?

If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain?
Plants → Goat → Lion

The following statement is true or false :
Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.

Why are there rarely more than five links (or five organisms) in a food chain?

Name two predators of snakes in a food web operating in a forest ecosystem.