Which endocrine gland controls the functioning of most other endocrine glands?

The movement of shoot towards light is

Sunflowers orient themselves towards the direction of sunlight. What type of tropism is this?

The sympathetic and parasympathetic nervous systems are parts of which system?

$A$ protective and an insulating sheath of myelin found around the axon is made up of ..........

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.