How much percentage of absorbed water is used in photosynthesis (in $\%$)?

Which of the following organisms exhibits autotrophic nutrition?

Green plants carry out 'photosynthesis',a ...$1$... process by which they use light energy to drive the synthesis of ...$2$... compounds.
$1 - 2$

$A$ plant that manufactures its own food is:

The use of a solar cooker by humans is a copy of which of the following processes?

What is the actual concentration of $CO_2$ in the atmosphere (in $\%$)?