Question

In a young root the most active absorption of water takes place through

• A. Root cap region
• B. Root hair region
• C. Zone of elongation
• D. Mature region with a corky layer

Answer 1

The correct option is B Root hair region

Active absorption mainly takes place by the expenditure of energy against the gradient. Root hairs are unicellular extensions of root epidermis called epiblema. They have thin walls and large surface area for absorption. Thus, most of the absorption of water occurs in root hair region. they are also surrounded by high mineral content which increases the osmotic potential of the soil in nearby by region. The water enters the root hair by active absorption of minerals, creating a low water potential inside the cell.

So, the correct answer is option B.