Which mechanism controls the timing and amount of hormone released?

What are the major parts of the brain? Mention the functions of different parts.

What is the role of motor areas in the brain?

Name the hormone synthesized at the shoot tips. How does it help the plant to respond to light?

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.

What are reflex actions? Give two examples. Explain a reflex arc.