Biology
Answer
The water absorbed by the roots is important for the plant in the following three ways:
- Transportation — The water in the plant body, both in xylem and phloem, transports substances in a solution form from one part to another.
- Food production — Water is required for photosynthesis. It combines with carbon dioxide from the air in the presence of sunlight and chlorophyll to produce glucose and oxygen.
- Cooling — The heat utilized when water is transpired from the surface of leaves in the form of water vapour induces a cooling effect.
Related Questions
The set up shown alongside was kept in sunlight for an hour. It was observed that drops of water appeared on the inside surface of the polythene bag.
(a) Name the process which is being demonstrated.
(b) Why was the pot with its soil left uncovered by the polythene bag?
(c) Why was the pot left in sunlight?
(d) Suppose that the pot in this experiment was placed inside a dark room instead of placing it in sunlight for some time. What difference would be noticed?
Briefly explain, how transpiration helps in the upward conduction of water in plants?
How does temperature, light intensity and wind affect transpiration?
Draw a magnified view of the root hair and label all its parts neatly. From the parts labelled by you, name the parts matching the description given below:
(a) Outermost layer of the root
(b) Unicellular outgrowth
(c) Part that is freely permeable
(d) Part that is semi-permeable