Which of the following is an odd nerve?

When we move from darkness into bright light,we cannot see for a short time,but after a while,our vision becomes normal. This is an example of ..........

In humans,if the abducens nerve is damaged,which of the following functions will be affected?

$A$: Postganglionic nerve fibers of the parasympathetic nervous system have acetylcholine,while the sympathetic nervous system has adrenaline (epinephrine) as the neurotransmitter.
$R$: The sympathetic nervous system inhibits intestinal peristalsis,while the parasympathetic nervous system stimulates peristalsis.

Choose the correct option:
$(1)$ The saccule and utricle contain a projecting ridge called the $ \text{crista} / \text{macula} $.
$(2)$ The space between the cornea and the lens is called the $ \text{aqueous chamber} / \text{vitreous chamber} $.

Give a brief account of
$(a)$ Mechanism of synaptic transmission
$(b)$ Mechanism of vision
$(c)$ Mechanism of hearing