Assertion :The direction of movement of organic solutes in the phloem is bidirectional. Reason: The transportation depends on variability of source-sink relationship.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Assertion is correct but Reason is incorrect
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Both Assertion and Reason are incorrect
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Phloem transport is the long distance movement of organic substances
from the source or supply end (region of manufacture or storage) to the
region of utilisation or sink. But the source and sink may be reversed
depending on the season or need of the plants. Sugar stored in roots may
be mobilized to become a source of food in the early spring when the
buds of trees act as sink and require energy for their growth and
development. Since the source- sink relationship is variable, the
direction of movement of organic solutes in phloem can be upwards or
downwards i.e., bidirectional.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.