During photosynthesis,$H_2O$ undergoes $.............$ and $CO_2$ undergoes $.............$.

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.

$A -$ Productivity of $C_3$ plants is higher than $C_4$ plants.
$R -$ Photorespiration occurs in $C_3$ plants.

When green algae are illuminated,motile aerobic bacteria usually accumulate near them. This is because,bacteria

Analogy type questions:
$(1)$ Middle lamella : Calcium pectate :: Cytochrome : ........
$(2)$ Thiamine : Vitamin :: Manganese : ........

All the energy for living organisms comes as radiation in the form of......from the sun and is captured by.......