Which is the most complex part of the brain?

$A$ protective and an insulating sheath of myelin found around the axon is made up of ..........

How do we detect the smell of an agarbatti (incense stick)?

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.
$(iv)$ Cerebellum does not control posture and balance of the body.

State whether the following statement is true or false: Blood pressure,salivation,and vomiting are controlled by the cerebrum.

How does phototropism occur in plants?