If the growth of a plant is towards the stimulus, what is it called?

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.

What type of movement is shown by $Mimosa$ $pudica$ (touch-me-not) plant leaves when touched with a finger?

What is the correct direction of flow of electrical impulses?

Define neuron. Name the parts of the neuron where:
$(i)$ information is acquired?
$(ii)$ impulse must be converted into a chemical signal for onward transmission?

What is the movement of a plant towards gravity called?