Question on: WAEC Biology - 2005
A faster colour change of a dry cobalt chloride paper affixed to the lower surface of a leaf than the upper one, indicates 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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Correct Option: B
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