English Medium Class 10 - CBSE Question Bank Solutions for Science

The sea water contains water beetles, tadpole, fish and weeds.

Which organisms can trap solar energy to make food?

The sea water contains water beetles, tadpole, fish and weeds.

Which organism is a secondary consumer?

The following is a food chain that ends with human :
plants → bee → human

Explain how plants provide food for bees.

The following is a food chain that ends with human :
plants → bee → human

How do bees provide food for humans?

The following is a food chain that ends with human :

How does this food chain differ form a usual food chain involving human such as : plants → goat → human?

The following is a food chain that ends with human :

Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.

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.