Concept:Gases move from a region of higher concentration to a region of lower concentration through the stomata.
Explanation:During photosynthesis, oxygen gas (
O2) is produced inside the leaf.
This makes the oxygen concentration inside the leaf higher than the oxygen concentration in the surrounding air.
To balance this difference, oxygen moves out through the stomata.
This movement of oxygen from a high concentration to a low concentration is called diffusion.
Diffusion is a passive process, so it does not require energy.
Osmosis involves water movement, active transport requires energy, and transpiration pull involves water loss through leaves.
Therefore, the escape of oxygen during photosynthesis is simply due to diffusion.
Answer:A. diffusion