Question

the major function of root hairs on roots is to ______.
a. absorb water and minerals from the soil
b. keep the root warm
c. protect the root as it pushes through the soil
d. grow into larger roots

Explanation:

Root hairs are tiny extensions of root epidermal cells. Their primary function is to increase the surface area of the root, which helps in the absorption of water and dissolved minerals (like nitrates, phosphates) from the soil. Option b is incorrect as root hairs don't have a role in keeping roots warm. Option c is incorrect because the root cap (not root hairs) protects the root tip as it grows through the soil. Option d is incorrect as root hairs don't grow into larger roots; they are just extensions for absorption. So the correct function is absorption of water and minerals.

Answer:

a. absorb water and minerals from the soil