The process of uptake of $CO_2$ and release of $O_2$ by plants is called ...

Which would do maximum harm to a tree?

$ATP$ is produced during:

Algae and other submerged plants float on the water surface during the day and sink to the bottom at night because...

In submerged hydrophytes,the entry of $CO_2$ is through:

Consider the following statements regarding photosynthesis and respiration in plants and select the correct option.
$I$. RuBisCO has high affinity to oxygen in low $CO_2$ concentration.
$II$. The Calvin pathway occurs in the chloroplast of bundle sheath cells of $C_4$ plants.
$III$. Yeast poison themselves when the concentration of alcohol reaches $7\%$.
$IV$. Oxygen is a final hydrogen acceptor during aerobic respiration.