Question

An outline sketch of a tree is shown in a diagram below. Study the same and answer the questions that follow:

1. Name and define the phenomenon labelled A in the diagram.
2. Write the significance of the process mentioned in A for the plants.
3. What do the direction of the arrows in B and C indicate? Name the phenomena.
4. Draw a neat and labelled diagram of an opened stomata.

Answer 1

1. Transpiration, in plants, is the evaporative loss of water from aerial portions (leaves and stems).
2. Significance of transpiration for the plants:
   1. Cooling effect
   2. Creating Suction force
   3. Distribution of water and minerals.
3. Arrow B shows water rising up the trunk, and the phenomenon is lenticular transpiration in the ascent of sap.
   Endosmosis is the phenomenon whereby arrow C denotes water absorbed by roots from the earth.
4.