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Question

One important difference between the anatomy and physiology of roots and leaves is that

A
Unlike roots, the xylem vessels in leaves normally transport sap in both directions
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B
A waxy cuticle covers most leaves but is absent in roots
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C
Leaves, but not roots, have ground tissue consisting mainly of parenchyma cells
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D
Phloem always conducts sap away from leaves and toward roots
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Solution

The correct option is B A waxy cuticle covers most leaves but is absent in roots
The leaves are covered with waxy cuticle but roots do not possess any cuticle. Cuticle helps in preventing loss of water from the surface of the leaves. Since roots are present underground immersed in the soil they do not show transpiration and hence no cuticle is present.
Hence, the correct answer is 'A waxy cuticle covers most leaves but is absent in roots'.

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