STD 11 - 8. Cell the unit of life — BIOLOGY STD 11 Science — Question

Statement $I$: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to $\mathrm{RuBisCO}$, hence $\mathrm{CO}_2$ fixation is decreased.

Statement $II$: In $\mathrm{C}_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.

In the light of the above statements, choose the correct answer from the options given below:

$(I)$ Compound epithelium is made of multi layered of cells.

$(II)$ Limited role in secretion and absorption.

$(III)$ To provide protection against chemical and mechanical stresses.

$(IV)$ It present in $PCT$.