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Question
What is the direction of movement of sugars in phloem?
What is the direction of movement of sugars in phloem?
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Solution
The correct option is A Bi-directional
Phloem is a conducting tissue that transports food from source to sink.
The part of the plant that synthesizes food is usually considered as source and the part that either needs or stores food is called sink.
However, the source and sink can be reversed depending on the requirement of the plant. The sugars stored in roots may be mobilised to become a source of food for the buds of trees as they need energy for growth and development.
Hence, the direction of movement in the phloem can be upwards or downwards, i.e., bi-directional as the source-sink relationship is variable.
Phloem is a conducting tissue that transports food from source to sink.
The part of the plant that synthesizes food is usually considered as source and the part that either needs or stores food is called sink.
However, the source and sink can be reversed depending on the requirement of the plant. The sugars stored in roots may be mobilised to become a source of food for the buds of trees as they need energy for growth and development.
Hence, the direction of movement in the phloem can be upwards or downwards, i.e., bi-directional as the source-sink relationship is variable.
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