The opening of a tulip flower is an example of which type of movement?

The shape of guard cells changes due to change in the :

The growth of tendril in pea plants is due to:

State how the concentration of auxin stimulates the cells to grow longer on the side of the shoot that is away from light.

Which of the following statements are true about the brain?
$(i)$ The main thinking part of the brain is the hindbrain.
$(ii)$ Centres of hearing,smell,memory,sight,etc.,are located in the forebrain.
$(iii)$ Involuntary actions like salivation,vomiting,and blood pressure are controlled by the medulla in the hindbrain.
$(iv)$ The cerebellum does not control posture and balance of the body.

The growth of pollen tubes towards ovules is due to: