Question

Which of the following act as sink?

• A. Root cells
• B. Fruit
• C. Seeds
• D. All of the above

Answer 1

The correct option is D All of the above

Translocation of organic solutes in phloem is bidirectional. The transport of prepared food is from source to sink.

The source is the area, where sugars are present in larger amount either because they are synthesized there example leaves sink in the region of sugar utilisation. There is a dynamic balance between source and sink and they also keep on shifting depending on the physiological requirements of the plant.

In some plants like carrot, radish etc., sugars are stored in roots.

Hence, in these plants roots serve as sink.

In most of the plants fruits serve as sink because they store food in epicarp. Seeds store food for the embryo. Seed store food in endosperm or cotyledons. Hence, seeds serve as sink.