Which gland produces the hormone thyroxine?

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

Which part of the brain is responsible for the coordination of physical movements like dancing, cycling, and walking?

State whether the following statement is true or false: Abscisic acid inhibits growth.

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 the spinal cord to muscles.
$(iii)$ Motor neurons carry signals from receptors to the spinal cord.
$(iv)$ The path through which signals are transmitted from a receptor to a muscle or a gland is called a reflex arc.

Which is the correct sequence of the components of a reflex arc?