BIOL251 HUMAN ANATOMY & PHYSIOLOGY
I W/LAB 2026 | MODULE 8 EXAM REVIEW
100+ QUESTIONS AND CORRECT ANSWERS
WITH RATIONALE
SECTION 1: THE SPECIAL SENSES - VISION
Question 1
Which part of the eye controls the amount of light
entering the eye?
A) Retina
B) Cornea
C) Iris
D) Optic Nerve
Answer: C) Iris
Rationale: The iris adjusts the pupil size to regulate the
amount of light entering the eye. It contains smooth muscle
that contracts or relaxes to change pupil diameter. The retina
detects light, the cornea refracts light, and the optic nerve
transmits visual information.
,Question 2
Rods are primarily responsible for:
A) Color vision
B) Bright light vision
C) Dim light vision
D) Depth perception
Answer: C) Dim light vision
Rationale: Rods function in low-light (night) vision and are
more sensitive to light than cones. They do not detect color.
Cones are responsible for color vision and bright light vision.
Question 3
Cones are responsible for:
A) Dim light vision
B) Color vision
C) Peripheral vision
D) Night vision
Answer: B) Color vision
,Rationale: Cones are photoreceptors that detect color and
function best in bright light. They are concentrated in the
fovea centralis for sharp central vision. Rods are responsible
for dim light vision.
Question 4
The fovea centralis contains:
A) Only rods
B) Only cones
C) Both rods and cones
D) No photoreceptors
Answer: B) Only cones
Rationale: The fovea centralis contains only cones, making it
the area of sharpest vision. This high concentration of cones
provides the greatest visual acuity for detailed central vision.
Question 5
The blind spot (optic disc) is where:
A) Rods are absent
, B) Cones are absent
C) The optic nerve exits the eye
D) Both A and B
Answer: C) The optic nerve exits the eye
Rationale: The blind spot is where the optic nerve exits the
eye. There are no photoreceptors here, resulting in a blind
spot in the visual field.
Question 6
The cornea is responsible for:
A) Light detection
B) Refraction of light
C) Sound amplification
D) Smell detection
Answer: B) Refraction of light
Rationale: The cornea is the transparent outer layer of the
eye responsible for refracting (bending) light entering the
eye. It provides most of the eye's optical power.
I W/LAB 2026 | MODULE 8 EXAM REVIEW
100+ QUESTIONS AND CORRECT ANSWERS
WITH RATIONALE
SECTION 1: THE SPECIAL SENSES - VISION
Question 1
Which part of the eye controls the amount of light
entering the eye?
A) Retina
B) Cornea
C) Iris
D) Optic Nerve
Answer: C) Iris
Rationale: The iris adjusts the pupil size to regulate the
amount of light entering the eye. It contains smooth muscle
that contracts or relaxes to change pupil diameter. The retina
detects light, the cornea refracts light, and the optic nerve
transmits visual information.
,Question 2
Rods are primarily responsible for:
A) Color vision
B) Bright light vision
C) Dim light vision
D) Depth perception
Answer: C) Dim light vision
Rationale: Rods function in low-light (night) vision and are
more sensitive to light than cones. They do not detect color.
Cones are responsible for color vision and bright light vision.
Question 3
Cones are responsible for:
A) Dim light vision
B) Color vision
C) Peripheral vision
D) Night vision
Answer: B) Color vision
,Rationale: Cones are photoreceptors that detect color and
function best in bright light. They are concentrated in the
fovea centralis for sharp central vision. Rods are responsible
for dim light vision.
Question 4
The fovea centralis contains:
A) Only rods
B) Only cones
C) Both rods and cones
D) No photoreceptors
Answer: B) Only cones
Rationale: The fovea centralis contains only cones, making it
the area of sharpest vision. This high concentration of cones
provides the greatest visual acuity for detailed central vision.
Question 5
The blind spot (optic disc) is where:
A) Rods are absent
, B) Cones are absent
C) The optic nerve exits the eye
D) Both A and B
Answer: C) The optic nerve exits the eye
Rationale: The blind spot is where the optic nerve exits the
eye. There are no photoreceptors here, resulting in a blind
spot in the visual field.
Question 6
The cornea is responsible for:
A) Light detection
B) Refraction of light
C) Sound amplification
D) Smell detection
Answer: B) Refraction of light
Rationale: The cornea is the transparent outer layer of the
eye responsible for refracting (bending) light entering the
eye. It provides most of the eye's optical power.
