Write true or false for the statement: Symptoms of goitre lead to swelling in the abdomen.

What type of movement is shown by $Mimosa$ $pudica$ (touch-me-not) plant leaves when touched with a finger?

What does the central nervous system in humans consist of?

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

What is meant by hydrotropism? Give an example.

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.