Acute vision is present in
vulture
shark
bat
frog
In humans, visceral organs are innervated by
sympathetic nerves and are under conscious control
parasympathetic nerves and are under conscious control
Both (a) and (b)
both sympathetic and parasympathetic nerves but are not under conscious control
CNS is mostly made of
motor neurons and sensory neurons
sensory neurons and association neurons
association neurons
motor neurons and association neurons
Retina is most sensitive at
optic disc
periphery
macula lutea
fovea centralis
Iris is part of
sclerotic
choroid/uvula
choroid and retina
sclerotic and choroid
Ivan Pavlov performed experiments on
simple reflexes
conditional reflexes
cardiac reflexes
origin of life
In which animal nerve cell is present but brain is absent?
Sponge
Earthworm
Cockroach
Hydra
Afferent nerve fibres carry impulses from
effector organs to CNS
receptors to CNS
CNS to receptors
CNS to muscles
Function of iris is to
move lens forward and backward
refract light rays
bring about movements of eye lids
alter the size of pupil
Sensitive pigmented layer of eye is
cornea
retina
iris
