In $C_{3}$ plants, the first stable product of photosynthesis during dark reaction is

Why is $RuBisCo$ enzyme the most abundant enzyme in the world?

Why is regeneration necessary in the Calvin cycle?

Which of the following is a seven-carbon compound in the $C_3$ cycle?

$3 CO_{2} + 9 ATP + 6 NADPH + \text{water} \rightarrow \text{glyceraldehyde 3-phosphate} + 9 ADP + 6 NADP^{+} + 8 \Pi$. Analyse the above reaction and answer the following questions:
$(a)$ How many molecules of $ATP$ and $NADPH$ are required to fix one molecule of $CO_{2}$?
$(b)$ Where in the chloroplast does this process occur?

To reduce $1$ $CO_2$ in $C_3$ cycle,assimilatory power needed is