Assertion: Long distance flow of photoassimilates in plants occurs through sieve tubes.
Reason: Mature sieve tubes have parietal cytoplasm and perforated sieve plates.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Explanation:
Light is an important factor in transpiration. The stomata opens well on days when light is brighter. It is also evident on cloudy days that the stomata does not open well. Hence, light induces stomatal opening and darkness closing.