Explain the root modification in plants.

Write the quadrants in which the following points lie:

$\left(-4,7\right)$

Refer to the given dichotomous key.

I. (a) It conducts food, water and minerals to different parts of the plant. -Go to Il
(b) It absorbs water. -Go to Ill

Il. (a) It is modified to climb. - $\boxed{P}$
(b) It is modified to store water - $\boxed{Q}$

Ill. (a) It is modified to climb - $\boxed{R}$
(b) It is modified to absorb moisture from air - $\boxed{S}$

Select the incorrect option regarding $P-S$.

Differentiate the pneumatophore root and epiphytic root.