Who found out that oxygen evolved from water in photosynthesis?

Which pigment is absent in each photosystem?

The reaction center is different in both the photosystems.

How many carbon atoms does OAA contain?

Which of these is the C4 acid?

Which of these is a C4 plant?

Which of these plants are grown in carbon dioxide enriched atmosphere?

Which of the following is the main function of carotenes?