Question

1. which part gives the eye its color?

a) retina
b) iris
c) cornea
d) lens

1. which nerve connects the eye to the brain?

a) retinal nerve
b) spinal nerve
c) optic nerve
d) ciliary nerve

1. where are cones concentrated in the retina?

a) edges
b) center
c) back
d) middle

1. what happens when the iris contracts?

a) pupil gets larger
b) pupil gets smaller
c) lens focuses light
d) retina moves

1. which part prevents foreign particles from entering the eye?

a) lens
b) cornea
c) retina

1. the retina contains which two types of photoreceptors?

a) rods and cones
b) pupils and iris
c) lens and cornea
d) ciliary and optic

Explanation:

• Q71: The iris gives the eye its color. It contains pigment - producing cells.
• Q72: The optic nerve connects the eye to the brain, transmitting visual information.
• Q73: Cones are concentrated in the center of the retina, in an area called the fovea, for sharp color vision.
• Q74: When the iris contracts, the pupil gets smaller to control the amount of light entering the eye.
• Q75: The cornea is the clear front - part of the eye that helps focus light and also protects the eye from foreign particles.
• Q76: The retina contains two types of photoreceptors, rods and cones. Rods are for low - light vision and cones are for color and high - acuity vision.

Answer:

Q71. b. Iris
Q72. c. Optic nerve
Q73. b. Center
Q74. b. Pupil gets smaller
Q75. b. Cornea
Q76. a. Rods and cones