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  4. Cobalt chloride paper is used to study which phenomenon in plants?

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Q. Cobalt chloride paper is used to study which phenomenon in plants?

Transport in Plants

Solution:

Cobalt chloride paper is used to study the phenomenon of transpiration in plants. Dry cobalt chloride paper that is blue in colour turns pink when it comes in contact with water. Using this property of cobalt chloride paper we can demonstrate water loss during transpiration. We can measure the rate of transpiration by using the time taken for the paper to change its colour from blue to pink.