Question

The movement of food substances in phloem can be in all directions. Give reason

Answer 1

Answer:

Usually, the source is the part of a plant where food is synthesised and the sink is the part of the plant where the food is required or stored.

However, it can be reversed, especially during seasonal changes or according to the plant’s need.

In the early spring, sugar stored in the roots is sometimes used and acts as a source, and the buds of trees which need energy for growth and development of the photosynthetic apparatus act as a sink.

Hence, the source-sink relationship is variable in plants, and the direction of movement of food in the phloem is bidirectional.

Answer 2

Food Transported in Plants

Explanation:

• Phloem transports food materials from the leaves to various pieces of the plant
• The transportation of food in phloem is achieved by using energy from ATP which helps in making osmotic weight that transport food from the area of high high concentration to low concentration
• Materials are transferred from leaf cells or from the site of storage into phloem tissue. For this energy is required which is given by the ATP molecules