Biology for IGCSE & O level - Coordination And Response (Section 2 - No. 37)

What is the role of auxin in plants?

Auxin controls plant growth by causing the cells to elongate.

Auxin controls plant growth by causing the cells to shorten.

Auxin prevents plant growth.

Auxin has no role in plant growth.

Auxin is a plant hormone which stimulates plant cell elongation.