A higher light intensity means more packets of light called photons are hitting the leaves. Without enough light, a plant cannot photosynthesise very quickly. Even if there is plenty of water and carbon dioxide and a suitable temperature. Increasing the light intensity increases the rate of photosynthesis. Or vise versa.
Vitamin a stays accumulated in your system and so only a concern if Greg is vitamin a deficient but he is probably getting other sources of vit a in his diet as well
The chloroplasts are cell generators they take in all the carbon dioxide and water and end up releasing sugar and oxygen basically called photosynthesis
