The movement of the flower of the Sunflower towards the direction of the Sun is called .........

Which of the following is not associated with the growth of a plant?

$(a)$ 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 part of the neuron receives messages from sensory organs?

Which type of movement is responsible for the response to external stimuli seen in $Mimosa$ (touch-me-not plant)?

How does the feedback mechanism regulate hormone secretion?