Advertisements
Advertisements
प्रश्न
Describe an experiment to prove that transpiration occurs more from the undersurface of dorsiventral leaves.
उत्तर
Two equal pieces of cobalt chloride paper are dried and placed on the upper surface and the other on the lower surface of dorsiventral leaves. They are firmly held in place by pieces of cello tapes or glass slides. After a few minutes, the cobalt chloride paper shows change in colour from blue to pink. The time taken for the cobalt chloride paper on the upper surface of the leaf to turn pink is much longer than for the under surface. Thus, it proves that the rate of transpiration is greater from the undersurface of dorsiventral leaves.
APPEARS IN
संबंधित प्रश्न
The set up shown alongside was kept in sunlight for an hour. It was observed that drops of water appeared on the inside of the polyethylene bag.
- Name the process which is being demonstrated.
- Why was the pot and its soil left uncovered by the polythene bag?
- Why was the pot left in the sunlight?
- Suppose the pot in this experiment was placed inside a dark room instead of placing it in sunlight for some time. What difference will be noticed?
State whether the following statement is true or false. Rewrite the false statement correctly.
Transpiration is the loss of water from the roots of the plant.
Why is there a need for a transport system in plants and animals?
Give suitable explanation for the following:
Perspiration and transpiration help to cool the body temperature of the organism.
Name the cell that surrounds the stoma.
Plants lose water by the process of transpiration.
What causes the opening and closing of guard cells of stomata during transpiration?
Do different species of plants growing in the same area show the same rate of transpiration at a particular time? Justify your answer.
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
ABA (Abscisic acid) is called a stress hormone. How does this hormone overcome stress conditions?
