Question

The length of root hair is

• A. 1-10 mm
• B. 11-20 mm
• C. 21-30 mm
• D. 31-40 mm

Hint:

Factual data questions are common. Always remember: Root hairs are strictly unicellular and constantly measure between 1 to 10 mm in length.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Root hairs are unicellular, tubular extensions of the root epidermis (epiblema) found specifically in the maturation zone of the root.
Their primary function is to increase the surface area available for water and mineral absorption.

Step 2: Key Formula or Approach:
Recall the factual biological data regarding the standard dimensions of root hairs as prescribed by the curriculum.

Step 3: Detailed Explanation:
Root hairs are incredibly delicate and short-lived (ephemeral) structures.
They are microscopic in diameter but grow to a measurable length that can be seen.
According to standard botanical observations and biological textbooks, the typical length of a root hair ranges strictly from 1 to 10 millimeters.
Any length greater than this would make the single-celled hair too fragile to survive the mechanical friction of soil particles.

Step 4: Final Answer:
The standard length of a root hair is 1-10 mm, matching option (A).