English Medium कक्षा १० - CBSE Question Bank Solutions for Science

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.

Fill in the following blank with suitable word :

Pesticides enter the food chain at the ...........level

Fill in the following blank with suitable word :

 Grass → ........... → Human

Fill in the following blank with suitable word :

Lettuce → ............. → Fox

Fill in the following blank with suitable word :

Plants → Antelope → ............

What is ten per cent law? Explain with an example.

Explain how harmful chemicals enter our bodies.

'If we excessively use pesticides to protect the crops from diseases, then it may cause long-term  damage to mankind'. Justify this statement.

Will the levels of biological magnification be different at different levels of the ecosystem?

 With the help of a food chain, explain how biological magnification of harmful chemicals can occur.

What is meant by bioconcentration of pesticides

Which common pesticide has accumulated in human body in considerable amounts?

What does garbage consist of?

Consider the following food chain

(i) Plants → Mice → Snakes → Hawks
(ii) Plants → Mice →Hawks
If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.: