There are not many words that start with Z that are directly associated with photosynthesis, but here are a few:
1. Zeaxanthin - A yellow pigment that is present in the chloroplasts of plants and algae. It plays a role in protecting the photosynthetic apparatus from damage caused by excess light.
2. Z-scheme - A model that describes the flow of electrons during photosynthesis, from the absorption of light energy by photosystems I and II to the production of ATP and NADPH.
3. Zanthophylls - Yellow pigments that are present in the chloroplasts of plants and algae. They help to absorb excess light energy and protect the photosynthetic apparatus from damage.
4. Zygote - Although not directly related to photosynthesis, the zygote is the initial cell formed when two gamete cells (such as egg and sperm cells) fuse during sexual reproduction in plants. The zygote eventually develops into an embryo, which includes the photosynthetic structures of the plant.
Hope this helps!