Which hormone is produced by the pancreas?

Iodine is necessary for the synthesis of which hormone?

Differentiate between the nervous system and the hormonal system.

$(a)$ 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?

The hormones are transported through ..........

What type of tropism do plant tendrils exhibit?