Question

A decapitated (tip of the plant is removed) plant exposed to light __________.

• A. Bends away from source of illumination
• B. Bends towards the source of light
• C. Shows zigzag curvature
• D. Does not show bending movement

Answer 1

The correct option is D Does not show bending movement

The plant growth regulator that brings about the growth and bending of the stem towards light is present only at the tip, i.e the apex of the stem.

So, when the tip is removed or decapitated, the part containing the hormone responsible for bending (auxin) is also lost. Hence, a decapitated plant does not show any bending movement when exposed to light.

Thus, the correct answer is option D>