First slide

Phloem Transport: Flow from Source to Sink

Question

Direction of movement in the phloem is bi-directional because-

Easy

A

Source-sink relationship is variable
B

Source-sink relationship is constant
C

Source of sugar in plant always remain source and never becomes sink
D

Cytoplasm of sieve tubes show streaming movement

Solution

Source and sink may be reversed depending on the season, or the plant’s needs. 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; 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

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