Question

Which of the following movements is not related to change in auxin levels?

• A. Nyctinastic leaf movement
• B. Movement of roots towards soil
• C. Movements of sunflower tracking the direction of the sun
• D. Movement of shoot towards light

Answer 1

The correct option is A Nyctinastic leaf movement

Auxin is a growth hormone which is mainly responsible for phototropic movement while nyctinasty is the circadian rhythmic nastic movement of higher plants in response to the onset of darkness. Examples are the closing of the petals of a flower at dusk and the sleep movements of the leaves of many legumes.

So, the correct answer is option A.