A faster colour change of a dry cobalt chloride paper aff...
A faster colour change of a dry cobalt chloride paper affixed to the lower surface of a leaf than the upper one, indicates that
sunlight slows down water loss from the upper surface
the lower surface of the leaf has more stomata
Sunlight causes the stomata on the upper surface to close
stomata are not present on the upper surface of a leaf
Correct answer is B
No explanation has been provided for this answer.
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