Cobalt chloride method for demonstration of transpiration was first used by

Freeman

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Stahl

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Darwin

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Gonong

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Solution

The correct option is B Stahl
Stahl was the first scientist who used cobalt chloride method for demonstration of transpiration by leaves of plants.
This was done due to the property of cobalt chloride paper to change colour from blue to pink when it comes in contact with water. So by wrapping leaves with this paper, it can easily demonstrate the transpiration process.

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Similar questions

Q. Cobalt chloride method was first used by

What is the characteristic feature of the cobalt chloride paper used in the transpiration experiment?

Cobalt chloride paper is used to demonstrate which of the following process?

Q. Match the columns :

	LIST I		LIST II
A.	Girdling experiment	1.	Osmotic Pressure
B.	Cobalt chloride paper method	2.	Transpiration
C.	Osmometer	3.	Unequal transpiration on two surfaces
D.	Bell jar experiment	4.	Translocation in phloem

Which of the following statement is correct :
1. At night, these guard cells swell with water and become bloated, opening the stoma.
2. During the day, the guard cells release their water and the stomata close.
3. More than 97% percent of water reaching the leaves is used in plant growth and photosynthesis.
4. The rate of transpiration can be easily demonstrated by cobalt chloride paper test.

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