How many lobes does the surface of the cerebral hemisphere possess?

The junction between two neurons is called:

What is the stimulus involved in the process of thigmotropism?

Define 'reflex action'.

Name the part of the neuron:
$(i)$ where information is acquired.
$(ii)$ through which information travels as an electrical impulse.

$(a)$ An old man is advised by his doctor to take less sugar in his diet. Name the disease from which the man is suffering. Mention the hormone due to imbalance of which he is suffering from this disease. Which endocrine gland secretes this hormone?
$(b)$ Name the endocrine gland which secretes growth hormone. What will be its effect on a person of:
$(i)$ Deficiency of growth hormones?
$(ii)$ Excess secretion of growth hormones?