Why??????

Asked by dhairya | 22nd Apr, 2009, 07:50: PM

Expert Answer:

Here you are referring to 2 different processes. When humans take in oxygen and exhale carbon dioxide, we are carrying out the process of respiration which helps to release energy from food. When plants take in carbon dioxide and give out oxygen, they are carrying out photosynthesis, by which they trap solar energy and prepare their food. Plants also carry out respiration all the time, during which they use oxygen to breakdown the food and release energy.

Answered by  | 23rd Apr, 2009, 10:25: AM

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