Question

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

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

Answer 1

Answer: (A)

Movements in nyctinasty plants are not related to auxin levels.

Nyctinasty is a type of tactic movement of a plant where the movement of plants organs like leaves occur in rfesponse to day and light and thus known as sleep movements. (Circardian rhythm) Eg in case of Acasia torcuosa, the movement of leavs occur horizontal during the day and vertical during the night.

It is the movement of the plants' organs like roots towards the soil, sunflower tracking towards the sun which are regulated by the Auxin levels. So, the correct option is'Nyctinasty leave movements'.