Question

The physical process directly involved in the release of molecular oxygen from leaves is

• A. diffusion
• B. transpiration
• C. osmosis
• D. active transport

Answer 1

The correct option is A diffusion

The physical process involved in the release of molecular oxygen from leaves is diffusion. Diffusion is the movement of molecules or ions from a region of their higher concentration to their lower concentration. The exchange of oxygen and carbon dioxide between a plant and atmosphere through stomata is by the process of diffusion.
The loss of water from the aerial parts of the leaf in the form of water vapour through stomata is called transpiration.
Osmosis is movement of water (solvent) from the region of its higher concentration to lower concentration across a semipermeable membrane.
Active transport is movement of substances from a region of lower concentration to higher concentration against a concentration gradient using energy in the form of ATP .