Question

In a plant, auxin synthesis occurs in

• A. Cortex
• B. Xylem
• C. Phloem
• D. Root and shoot tips

Answer 1

The correct option is D Root and shoot tips

Auxin is a plant growth hormone that promotes growth via cell elongation, stimulates parthenocarpy, adventitious root formation and fights against abscission. It is synthesized in shoot tip and is moved down the stem under influence of force of gravity. Likewise, auxin synthesis in root tip is followed by its upward movement to shoot. Auxin movement from shoot and root tip is known as polar transport which is an energy driven process (active transport).

Thus, the correct answer is option D.