The spinal cord originates from:

The thigmonasty is the nastic movement of a plant in response to

How is the timing and the amount of hormone secreted by a gland regulated? Explain with an example.

The growth of pollen tubes towards ovules is due to

Dramatic changes of body features associated with puberty are mainly because of the secretion of:

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.
$(iv)$ Cerebellum does not control posture and balance of the body.