plant-water-relation

Question: When strips of chloride papers are placed on either side of a dorsi-ventral leaf, why the strips on the lower side become speedily pink ? Because



1) More $CO_2$ is evolved from the lower side
2) More $O_2$ is evolved from the lower side
3) More $H_2O$ is lost from the lower side
4) All the above
Solution: Explanation: No Explanation
Transpiration (General) and Stomata

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