What are the small fibers present on the cell body of a neuron called?

Write true or false for the statement: Growth of pollen tubes towards ovules is due to chemotropism.

Name various plant hormones and describe their physiological effects on plant growth and development.

Which of the following helps in maintaining the posture and balance of the human body?

Trace the sequence of events through a reflex arc that occurs when a bright light is focused on your eyes.

$(a)$ Name the part of the brain which controls:
$(i)$ voluntary actions,
$(ii)$ involuntary actions.
$(b)$ What is the significance of the peripheral nervous system? Name the components of this nervous system and distinguish between the origin of the two.