State whether the following statements are ‘true’ or ‘false’. If false write the correct statement.

State whether the following statements are ‘true’ or ‘false’. If false write the correct statement. 

1. The mesosphere in the atmosphere, contains most of the air, fit for respiration. 

2. The percentage of carbon dioxide in the air is between 0.2 to 0.4%. 

3. Carbon dioxide, water vapour and energy in the form of heat are evolved during respiration.

4. Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll. 

5. Air is a mixture and not a compound since the components of air cannot be separated by physical methods.