Define phototropism and give one example.

The thigmonasty is the nastic movement of a plant in response to

Differentiate between the nervous system and the hormonal system.

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 shape of guard cells changes due to change in the :

Choose the incorrect statement about insulin: