Why do endocrine glands release their secretions into the blood?

Which plant organ shows negative phototropism?

Which gland secretes growth hormone in human beings?

Dwarfism results due to

The response of plants to stimuli is limited because $...$

Which of the following statements are true about the brain?
$(i)$ The main thinking part of the brain is the hindbrain.
$(ii)$ Centres of hearing,smell,memory,sight,etc.,are located in the forebrain.
$(iii)$ Involuntary actions like salivation,vomiting,and blood pressure are controlled by the medulla in the hindbrain.
$(iv)$ The cerebellum does not control posture and balance of the body.