Question

Bending of stem/coleoptile towards light or shoot of the potted plant placed near a window is due to:

• A. Greater oxygen availability to the tip
• B. More auxin content on the shaded side
• C. Greater light availability to tip
• D. Availability of necessary warmth to the tip

Answer 1

Answer: (B)

Auxin is a plant hormone that plays an important role in phototropism. It is equally distributed in the plant cells that is why they show cell elongation. Auxin concentration is found more in the shaded side than illuminated side so the plant grow more on the shaded side and bend in the direction of the light source.