A leaf was covered with cobalt chloride paper on both surfaces

Name the process involved.

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Solution

Transpiration:
Transpiration is the phenomenon of evaporation of water from the plant surface. It is mainly through the stomata (90%).
Various environmental factors like temperature, light, wind, humidity and internal factors like the structure of the leaf and root-shoot ratio affect transpiration.
Transpiration not only brings about the ascent of sap but also has a cooling effect and saves the plant from heat injury.
When the transpiration rate exceeds the water absorption rate, it leads to wilting of the plant.
Though the apparatus potometer measures the rate of water uptake in plants, indirectly it is used to measure water lost by transpiration.

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Given above is the diagram of an experimental setup to study the process of transpiration in plants. Study the same and then answer the questions that follow:

(a) Name the color of dry cobalt chloride paper?

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(d) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.

Q. A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was then exposed to sunlight for six hours and then tested for starch. It was observed that:
(1) both covered and uncovered parts of leaf turned blue-black
(2) both covered and uncovered parts of leaf turned yellow-brown
(3) only the uncovered part of leaf turned blue-black
(4) only the covered part of leaf turned blue-black

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A leaf was covered with cobalt chloride paper on both surfaces Name the process involved.

A leaf was covered with cobalt chloride paper on both surfaces

Name the process involved.