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Consider the following two statements.
I. The direction of movement in the phloem is bi-directional.
II. The source-sink relationship in plants is variable.
Option: 1
Both I and II are correct and II explains I
Option: 2
Both I and II are correct but II does not explain I
Option: 3
I is correct but II is incorrect
Option: 4
Both I and II are incorrect
Answers (1)
Phloem Transport: From Source to Sink -
- Usually the source is understood to be that part of the plant which synthesises the food, i.e., the leaf, and sink, the part that needs or stores the food.
- But, the source and sink may be reversed depending on the season, or the plant’s needs.
- Sugar stored in roots may be mobilised to become a source of food in the early spring when the buds of trees, act as sink; they need energy for growth and development of the photosynthetic apparatus.
- Since the source-sink relationship is variable, the direction of movement in the phloem can be upwards or downwards, i.e., bi-directional.
-
Since the source-sink relationship is variable, the direction of movement in the phloem can be upwards or downwards, i.e., bi-directional. Hence, the correct answer is option a.
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