Biology
Describe an experiment to show that the plant loses water through its leaves.
Answer
Take a small-sized, well-watered potted plant with a few branches. Place a polythene bag over its one branch as shown in (A) and tie it with a rubber band.
Remove all the leaves from another branch (B) of the same plant, cover this too with a polythene bag and tie it with a rubber band.
Place the plant in sunlight, and observe it after 4-6 hours. We will notice that tiny water droplets have appeared on the inner surface of the polythene bag over branch A, while no water drops appear on branch B.
Conclusion — This experiment proves that plant loses water through its leaves.
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