Question

describe various regions of a typical root with the help of neat labelled diagram

Answer 1

The root is the descending portion of the plant axis. As opposed to the stem, it is positively geotropic, negatively phototropic and positively hydrotropic. The root sur­face is non-green and it is not divided into nodes and internodes.

In stems the branches arise from the nodes so that there is some regularity in their arrangement while this is not so in roots because of the absence of nodes. Nevertheless, the branching in roots also is acropal.

Roots bear branches only of similar type while stems bear similar and dissi­milar lateral members (branch, leaf and flower). Anatomically, root branches arise from an inner layer, i.e., they are of endogenous origin while shoot branches arise more super­ficially, i.e., they are exogenous.

Ground plan of a plant