Question

Assertion: A correct concentration of auxin and cytokinin is required for the development of root and shoot in a callus.

Reason: When the ratio of kinetin to auxin is high, then only shoots develop. But when the ratio is low then only roots develop.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is: (a)

Explanation:

The relative ratio of cytokinin (Kinetin to auxin (IAA) was considered important in determining the nature of organogenesis in tobacco pith tissue. It was shown that high level of kinetin caused bud initiation, while high concentration of auxin favoured rooting.