Question

How does phloem conduct food in plant?​

Answer 1

Answer:

The phloem tissue in plants transports food materials from the leaves to different parts of the plant. The transportation of food in phloem is achieved by utilizing energy from ATP. As a result, the osmotic pressure in the tissue increases forcing the water to move through it.

Answer 2

Answer:

Food is synthesized in the green parts of a plant. The non-green parts are depended on the photosynthetic cells for nourishment. The food in the form of sucrose is transported by the vascular tissue phloem. Let us learn a bit more about phloem transport. The transportation occurs in the direction of the source to sink. Transport of organic solutes from one part of the plant to the other through phloem sieve tubes is called translocation of organic solvents.

1. Pressure flow or Mass flow Hypothesis

• This theory was proposed by Munch and elaborated by Mars and others. It is the most accepted mechanism for translocation of Sugars in higher plants. It occurs in the following steps.

• The glucose prepared in the leaves is converted into sugar.

• The sugar in the form of sucrose is moved into the companion cells and then into the living phloem sieve tube cells by active transport.

• This creates a hypertonic condition in the phloem.

• Water in xylem vessels adjacent to phloem moves through endosmosis.

• Osmotic pressure rises and phloem SAP moves from an area of higher osmotic pressure to the area of low pressure.

• Osmotic pressure is maintained low at the sink.

• At the sink again active transport is required to move the sugar out of the phloem SAP into the cell where the sugar is used to release energy by the process of respiration.

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