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Biology 10 Chapte 12 - Coordination and Control - 13
1.
Which layer gives the inner eye a dark colour?
a) Choroid
b) Retina
c) Cornea
d) Sclera
2.
The ...............colour prevents disruptive reflections within the eye?
a) Transparent
b) Purple
c) Green
d) Dark
3.
What is the muscular ring called that is behind the cornea?
a) Lens
b) Iris
c) Pupil
d) Retina
4.
Behind cornea......................bends to form iris?
a) Choroid
b) Retina
c) Cornea
d) Sclera
5.
What is the round hole in the centre of iris called?
a) Pupil
b) Lens
c) Retina
d) Eyelid
6.
After striking the cornea, from where the light passes?
a) Eyelid
b) Lens
c) Pupil
d) Retina
7.
The size of pupil is adjusted by the muscles of.................?
a) Retina
b) Pupil
c) Iris
d) Lens
8.
What is the effect of bright light on pupil?
a) Pupil dilates
b) No effect
c) Pupil expands
d) Pupil constricts
9.
In bright light, circular muscles of iris...............?
a) Relaxed
b) Expand
c) All are correct
d) Contract
10.
In bright light, radial muscles of iris...............?
a) Relaxed
b) Contract
c) All are correct
d) Expand
11.
What is the effect of dim light on pupil?
a) Pupil dilates
b) Pupil constricts
c) Pupil relaxes
d) No effect
12.
In dim light, radial muscles of iris...............?
a) Contract
b) All are correct
c) Relaxed
d) Expand
13.
What is present behind the iris?
a) Sclera
b) Lens
c) Cornea
d) Pupil
14.
What is the nature of lens present behind iris?
a) Concavo-convex lens
b) Convex lens
c) Concave lens
d) Plano-concave lens
15.
To clearly see an object far away, what do lens do?
a) Becomes more convex
b) Becomes less convex+
c) Becomes less concave
d) Becomes more concave
16.
To clearly see an object far away, what do lens do?
a) Becomes less concave
b) Becomes more concave
c) Becomes more convex
d) Becomes less convex+
17.
When ciliary muscles relax, what do lens do?
a) Becomes less concave
b) Becomes more concave
c) Becomes more convex
d) Becomes less convex+
18.
When ciliary muscles contract, what do lens do?
a) Becomes less concave
b) Becomes less convex
c) Becomes more concave
d) Becomes more convex+
19.
What is the third layer of eye called?
a) Cornea
b) Choroid
c) Retina+
d) Sclera
20.
What is the sensory layer of eye called?
a) Sclera
b) Retina
c) Cornea
d) Choroid
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