Question

Many plant hormones show opposite effects. For example, the hormone present in the meristematic tissues of the shoots inhibits branching, whereas this effect is nullified by the hormones produced by roots. Which are these two hormones respectively?

A) Auxins and cytokinins
B) Ethylene and abscisic acid
C) Cytokinins and auxins

Answer 1

Option A, Auxins and cytokinins

Step-by-step explanation:

Both Auxin and cytokinin function opposite to each other. On one hand auxin is responsible for inhibiting the activation of axillary buds thereby causing branching in the shoot system. While on the other hand , the functioning of cytokinin is to promote cell division and make new plant organs in lower part of the plant body. It stimulate the process of branching in rootsystem.

Hence, option A is correct

Answer 2

A) Auxins and cytokinins

Step-by-step explanation:

Auxin is the plant hormone that is synthesized at the shoot tip. Function of auxin is to stimulate the growth of apical bud and to inhibit the growth of lateral or axillary buds. Inhibition of axillary buds inhibits the branching of shoot. Cytokinins are the plant hormones synthesized in root apical meristem and promote lateral bud growth. Hence, auxin and cytokinins exhibit antagonistic effects.