Which of the following compound is not degraded by any biological process?

Nitrogen-fixing bacteria are found in the roots of 

Venus and Mars have no life because

Which one of the following is not an air pollutant?

Nitrogen fixing bacteria cannot fix N₂ in presence of 

The prevailing wind patterns in an area decides ........ patterns.

We need to ........ our natural resources and use them in a .......... manner.

Increase in concentration of carbon dioxide in the atmosphere may cause ........ effect.

The combustion of fossil fuels increases the amount of ........ .......... in air.

Eukaryotic cells and many prokaryotic cells need oxygen to breakdown .......... molecules and get energy for their activities.

What are the different states in which water is found during the water cycle?

State any two harmful effects of air pollution.

Name any two environmental problems caused by various activities of human beings.

How does the atmosphere act as a blanket?

What is the difference between nitrification and denitrification?

If decomposers are removed completely from the Earth, what will be the result? Give reasons.

What are the sources of water pollution?

List three major factors which lead to water pollution. Give examples.

List the organisms and their role in nitrogen cycle.

What is "greenhouse effect'? What would be its effect? name two greenhouses gases.

Discuss the consequences of the increase in the concentration of carbon dioxide in the atmosphere.

Is it necessary to replenish forests?

April 22, is celebrated by countries all over the world as the Earth Day clean Delhi took the initiative and organised Saving the greens campaign.
Equipped with gloves,rakes,gunny, bags and a lot of enthusiasm,students  assembled at a park on the Ridge and took upon themselves the task of cleaning the Ridge. Activities that were carried out included picking up all the polybags that were littering a part of the ridge and removing advertisements nailed to trees.disturbing pamplets at the crossing to passersby In about on hours time the children managed to collect about 20 large gunny bags full of plastic
Answer the following questions based on above information
(a) What are messages sent by their activity to the public of Delhi?
(b) What is your suggestion?
(c) Which values are displayed by the childrean?