What is the movement of a plant shoot towards light called?

Which of the following plant hormones acts as a growth promoter?

$(a)$ 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?

Which of the following endocrine glands is unpaired?

In what form is the response to a stimulus generally observed in body parts?

Mention any four reflex actions of the body.