Practice Start Test

Neural Control and Coordination

NEET Biology · 57 questions · Page 1 of 6 · Click an option or "Show Solution" to reveal answer

Q1
Respiratory centre is situated in
A cerebellum
B medulla oblongata
C hypothalamus
D cerebrum
Correct Answer
Option B
Solution

(b) Respiratory centre is situated bilaterally in medulla oblongata.

Q2
Sensitive pigmented layer of eye is
A cornea
B retina
C sclerotic
D iris
Correct Answer
Option B
Solution

(b) Retina has 2 layers, an outer heavily pigmented (melanin containing) layer and an inner neurosensory layer containing rods and cones.

Q3
Afferent nerve fibre carries impulses from
A effector to central nervous system
B receptor to central nervous system
C central nervous system to muscles
D central nervous system to receptors
Correct Answer
Option B
Solution

(b) In nervous systems, afferent nerve fibres carry nerve impulse from receptors or sense organs towards the central nervous system.

Q4
Eye lens is formed from
A ectoderm
B mesoderm
C endoderm
D ectoderm and mesoderm
Correct Answer
Option A
Solution

(a) Ectoderm forms: Eye (conjunctiva, cornea, lens, retina, iris, ciliary muscles).

Mesoderm forms: Sclera & choroid of eye.

Q5
Light rays entering the eye is controlled by
A pupil
B iris
C cornea
D lens
Correct Answer
Option A
Solution

(a) Pupil is the opening which controls the amount of light entering in eye.

When light intensity is high, it decreases in size and when light intensity is low it dilates.

Q6
Retina is most sensitive at
A optic disc
B periphery
C macula lutea
D fovea centralis
Correct Answer
Option D
Solution

(d) Fovea centralis is the most sensitive part of retina. This is the area of most acute vision.

Q7
Function of iris is to
A move lens forward and backward
B refract light rays
C bring about movements of eye lids
D alter the size of pupil.
Correct Answer
Option D
Solution

(d) Iris controls the size of pupil by contracting or relaxing of its circular muscles.

It controls the amount of light entering in eye.

Q8
Cornea transplantation is outstandingly successful because
A cornea is easy to preserve
B cornea is not linked up with blood vascular and immune systems
C the technique involved is very simple
D cornea is easily available
Correct Answer
Option B
Solution

(b) Cornea transplants are easy, since there are no blood vessels involved.

Q9
In the chemistry of vision in mammals, the photosensitive substance is called
A sclerotin
B retinol
C rhodopsin
D melanin
Correct Answer
Option C
Solution

(c) Melanin is the pigment which gives colour to the skin.

Retinol is the other name for vitamin A.

Rhodopsin is the photosensitive substance.

Q10
Suspensory ligament is part of
A heart
B eye
C tongue
D brain
Correct Answer
Option B
Solution

(b) Stretching and relaxation of suspensory ligament changes the focal length of lens for accommodation.

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