What is the function of neurons?

What are axons and where are they found in the animal body?

Which of the following statements are correct?
$I$. Dendrites are long fibres with branched distal ends.
$II$. Axons are short fibres which arise from the cell body.
$III$. The cell body of a neuron contains cytoplasm,a nucleus with cell organelles,and Nissl's granules.
$IV$. Dendrites transmit nerve impulses away from the cell body to a synapse.
The correct option is:

Bipolar nerve cells are present in

Afferent nerve fibers transmit impulses from:

Afferent nerve fibres carry impulses from