What are the small fibers present on the cell body of a neuron called?

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

Which of the following statements are true?
$(i)$ Sudden action in response to something in the environment is called reflex action.
$(ii)$ Sensory neurons carry signals from spinal cord to muscles.
$(iii)$ Motor neurons carry signals from receptors to spinal cord.
$(iv)$ The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.

Which gland secretes growth hormone in human beings?

Which of the following hormones requires iodine for its synthesis?

Give reasons :
$(a)$ Pituitary is often termed as master endocrine gland.
$(b)$ Pancreas helps in digestion and also regulates blood sugar level.
$(c)$ Adrenals are known as glands of emergency.