(a) Which part of the human brain is the most developed?
Ans. Cerebrum is the most developed part of the human brain. It controls higher mental functions like thinking, reasoning, memory, learning, and voluntary movements.

(b) Which part of our central neural system acts as a master clock?
Ans. Hypothalamus acts as the “master clock” of the body. It regulates circadian rhythms, hormone secretion, sleep-wake cycles, hunger, and thirst.