Question

Assertion :In some plants flowering depends only on a combination of light and dark exposure. Reason: The site of perception of light or dark duration are the shoot apices of plants.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is D Both Assertion and Reason are incorrect

Some plants require a periodic exposure to light to induce flowering. It is now also known that not only the duration of a light period but the duration of the dark period is also of equal importance. Hence, it can be said that flowering in certain plants depends not only on a combination of light and dark exposures but also their relative durations. This response of plants to periods of day/night is termed photoperiodism. The shoot apices modify themselves into flowering apices prior to flowering, shoot apices cannot perceive photoperiods by themselves. The site of perception of light/dark duration are the leaves.

So the correct answer is 'Both Assertion and Reason are incorrect'.