Question

Which of these would you use to prove that more water vapour is lost from one of the surfaces of a leaf?

• A. Cobalt chloride paper
• B. Parchment paper
• C. Cellophane
• D. Litmus paper

Answer 1

The correct option is A

Cobalt chloride paper

Cobalt chloride paper is used as an indicator to test the presence of moisture. It is blue when dry, and in the presence of moisture it turns pink.