The efficiency of water intake in roots would be greatly reduced if:?

Question

a. phloem cells were blocked
b. root hairs were destroyed
c. pith cells were blocked
d. the humidity was low

Answer 1

b.root hairs were destroyed.
this is because the water is first absorbed by the capillaries in the root hair and then transmitted to the pith.
the phloem has no role in absorption.
humidity will matter only in the long run as the roots absorb water already in the soil.