Q4 of 75 Page 441

Write true or false for the following statements :

Carbon dioxide is one of the greenhouse gases.

True

Greenhouse gases are those which have the ability to trap heat, carbon di oxide has the ability to trap heat and that is why is kept in the category of greenhouse gases.


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2

Write true or false for the following statements :

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

 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.

 5

Write true or false for the following statements :

Another process that adds to the CO2 in the atmosphere is the process of photosynthesis where fuels are burnt to provide energy for various needs.

 6

Write true or false for the following statements :

Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make carbohydrates.