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(C) Cobalt chloride paper is blue when dry and turns pink in the presence of moisture. Since dorsiventral leaves typically have a higher density of st

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More $H_2O$ is lost from the lower side

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(C) Cobalt chloride paper is blue when dry and turns pink in the presence of moisture. Since dorsiventral leaves typically have a higher density of stomata on the lower surface (abaxial surface) compared to the upper surface (adaxial surface),the rate of transpiration is significantly higher on the lower side. Consequently,more water vapor is released from the lower surface,causing the cobalt chloride paper to absorb moisture and turn pink more rapidly.

When strips of cobalt chloride paper are placed on either side of a dorsiventral leaf,why do the strips on the lower side become pink more speedily?

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