Plant transport systems move energy from leaves and raw materials from roots to all their parts.
The loss of water in the form of vapor from the leaves (i.e. aerial parts) of the plant is known as transpiration.
The transport of soluble products of photosynthesis is known as translocation.
It is the process of loss of water as vapour from aerial parts of the plant. This process helps the plants in the following ways :
(1) Absorption and upward movement of water and minerals dissolved in it from roots to the leaves.
(2) Helps in temperature regulation in plants. The effect of root pressure in transport of water is more important at night. During the day when the stomata are open, the transpiration pull becomes the major driving force in the movement of water in the xylem. No energy is used in transpiration
It is the process of transport of food from leaves (food factory) to different parts of the plant. Energy from ATP is used during translocation.
There are two main conducting pathways (tubes) in a plant :
1. XYLEM which moves water and minerals obtained from the soil.
2. PHLOEM which transports products of photosynthesis from the leaves, where they are synthesized, to the other parts of the plant