What do you mean by biological fixation of nitrogen?
The fixation of free (atmospheric) nitrogen by bacteria and blue green algae is known as biological fixation of nitrogen. The nitrogen fixing bacteria like rhizobium is found in the roots of the leguminous plants.
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?
What is the percentage of carbon dioxide in the atmosphere of Venus and Mars?
What are the two main ways in which oxygen is consumed and carbon dioxide is produced?
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