Question

Assertion: Dark periods play a more important part in flowering than light period.
Reason: Flowering occurs in short-day plant if the dark period is interrupted by light break.

• A. If both the assertion and reason are true and the reason is a correct explanation of the assertion
• B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
• C. If the assertion is true but the reaon is false
• D. If both the assertion and reason are false
• E. If the assertion is false but reason is true

Answer 1

The correct option is C If the assertion is true but the reaon is false

It has been demonstrated that flowering in plant is more of a response to the dark period than to the light period. In short day plants, plants can flower in complete darkness if supplied with exogenous nutrients. Flowering is prevented in them of dark period below the critical level is interrupted by a flash of light. Interruption of light by dark inhibits flowering under normal photoperiods.