Forests are called the lungs of the earth. Why?

The by-products of photosynthesis are

1. carbon dioxide, water and 38 ATP molecules.
2. carbon dioxide, ethyl alcohol and 2 ATP molecules.
3. oxygen and glucose.
4. carbon dioxide and glucose.

In aerobic respiration, the by-products are

1. carbon dioxide, water and 2 ATP molecules.
2. carbon dioxide, ethyl alcohol and 2 ATP molecules.
3. carbon dioxide, water and 38 ATP molecules.
4. oxygen, water and 38 ATP molecules.

Cellular respiration in plants takes place in the

1. chloroplast.
2. endoplasmic reticulum.
3. golgi bodies.
4. mitochondria.