The most vital process for the existence of life on Earth is

The energy stored in glucose basically comes from

$A$: Light harvesting complexes $(LHC)$ on thylakoid membrane broaden the range of light absorption.
$R$: They transfer electrons to the reaction centre.

Choose the incorrect sentences for chloroplast.
$(1)$ The chloroplast membranous system consists of grana and the fluid stroma.
$(2)$ Pigments are present in the stroma.
$(3)$ In the stroma,enzymatic reactions incorporate $CO_2$ into the plant,leading to the synthesis of sugar.
$(4)$ Light is not required for the formation of sugar in the stroma.

What is the quantum yield of photosynthesis (in $\%$)?

Suppose $Euphorbia$ and $Maize$ are grown in a tropical area. Which one of them do you think will be able to survive better under such conditions?