Q2 of 75 Page 441

Write true or false for the following statements :

The process of nitrogen-fixing is done by bacteria in the presence of oxygen.

False

Process of nitrogen fixation is done by prokaryotic bacteria. These bacteria possess a specific enzyme called “Nitrogenase”. Due to the presence of oxygen enzymatic structure is disrupted and nitrogen fixing property is lost.


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Smog is a combination of:

 1

Write true or false for the following statements :

Oxygen is returned to the atmosphere in only one major process, that is, respiration.

 3

Write true or false for the following statements :

Oxygen is necessary to life for most of the organisms in the process of respiration but some forms of life, especially bacteria, are poisoned by elemental oxygen.

 4

Write true or false for the following statements :

Carbon dioxide is one of the greenhouse gases.