AIIMS2015BotanyPlant - Growth and Development
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.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIfboth assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- DIf both assertion and reason are false.
Correct answer
A. If both assertion and reason are true and reason is the correct explanation of assertion.
Step-by-step solution
The relative ratio of cytokinin (kinetin) to auxin (IAA) is very important in determining the nature of organogenesis in tissue culture. High level of kinetin results in bud initiation, while high concentration of auxin favours rooting.