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Motion
Do all organisms require water? Give reasons.
Yes, all organisms require water. Water is very essential as :
(i) all cellular processes take place in a water medium in the body.
(ii) all the substances are transported from one part of the body to the other by water in dissolved or suspended form.
(iii) All the reactions that take place in the body occur in water as medium.
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We know that many human activities lead to increasing levels of pollution of the air, water-bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
Write a note on how forests influence the quality of our air, soil and water resources.
What are the two things which are essential for all forms of life on the earth?
What is biosphere?
What are the physical components?
What is biotic component?
Does there exist any relationship between the climate and biotic components? If yes, explain with example.
What percentage of oxygen and nitrogen is present in the air?
Name the pollutants by which industries pollute air.
How is balance of carbon dioxide and oxygen maintained in the environment?
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