Question

A plant placed near a window bends outward because

• A. Its tip is able to obtain more light.
• B. Its tip is able to receive necessary warmth.
• C. The auxin content on the shaded side is higher than that of the lighter side.
• D. Its tip is able to get more oxygen.

Answer 1

Answer: (C)

The auxin content on the shaded side is higher than that of the lighter side.

Auxins are the type of plant hormones (or plant growth substances) which plays an important role in the coordination of many growth and behavioral processes in the plant's life cycle and are essential for plant body development. Auxin induces shoot apical dominance. When the plant is placed near the window auxin in the shoot apex is sent to the shade part of the shoot and promotes the growth. Due to increased number of the cell at shaded part make the shoot bend toward the light.

Therefore, the correct answer is option C.