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A faster colour change of a dry cobalt chloride paper affixed to the lower surface of a ...

A faster colour change of a dry cobalt chloride paper affixed to the lower surface of a leaf than the upper one indicate that ____________

A. sunlight slows down water loss from the upper surface
B. the lower surface of the leaf has more stomata
C. sunlight causes the stomata on the upper surface to close
D. stomata are not present on the upper surface of a leaf





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