In plants,the uptake of $CO_2$ and the release of $O_2$ is a process called .........

Select the correct option:
$(1)$ Maize / Sunflower is a $C_4$ plant.
$(2)$ Rubisco / Oxygenase is the most abundant enzyme in the world.

Statement $P$: During the dark reaction of photosynthesis,ketotriose is synthesized.
Statement $Q$: The sugar present in the structure of $ATP$ is an example of a ketopentose sugar.

According to one estimate,how many $kg$ of carbon is fixed in the biosphere through photosynthesis annually?

Which of the following plants can show the $CAM$ cycle?

Which of the following factors is essential for photosynthesis?