How The Eye Works
Questions and Answers
- 1.
There are many parts to the eye, all of which have their different functions.-The lens finely focuses the light-The pupil controls how much light is let into the eye-The retina contains the rods and cones-The rods let you see black and white-The cones let you see colour-The vitreous humour is a jelly-like substance that holds the shape of the eye-The iris controls the size of the pupil-The optic nerve joins the eye to the brain, and transmits the electrical signals-The blind spot is the spot where there are no rods or cones, as it is where the optic nerve connects to the eye-The cornea is a thin layer of protective cells that also roughly focus the light-The ciliary muscles control the shape of the lens
- 2.
The iris...
- A.
Detects colours.
- B.
Controls the size of the pupil.
- C.
Controls the shape of the lens.
- D.
Finely focuses the image.
Correct Answer
B. Controls the size of the pupil.Explanation
The iris controls the size of the pupil, which is the black circular opening in the center of the eye. The size of the pupil determines the amount of light that enters the eye. In bright conditions, the iris contracts, making the pupil smaller to reduce the amount of light entering the eye. In dim conditions, the iris expands, making the pupil larger to allow more light to enter the eye. This mechanism helps to regulate the amount of light reaching the retina and ensures optimal vision in different lighting conditions.Rate this question:
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- 3.
What does the cornea do?
- A.
Protects the eye with transparent cells, and also roughly focuses the light.
- B.
Roughly focuses the light.
- C.
Jumbles up the light rays to be reassembled in the iris, and protects the eye with transparent cells.
- D.
Protects the eye with transparent cells.
Correct Answer
A. Protects the eye with transparent cells, and also roughly focuses the light.Explanation
The cornea is a transparent layer at the front of the eye that protects the eye from dust, germs, and other harmful substances. It acts as a barrier, preventing these substances from entering the eye and causing damage. Additionally, the cornea helps to focus light onto the retina, which is essential for clear vision. It accomplishes this by bending or refracting the incoming light rays, allowing them to converge on the retina and form a sharp image.Rate this question:
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- 4.
The pupil...
- A.
Controls how far away you can see in focus.
- B.
Abosrbs light.
- C.
Lets you see black (and white).
- D.
Controls the amount of light entering the eye.
Correct Answer
D. Controls the amount of light entering the eye.Explanation
The pupil is the opening in the center of the iris that controls the amount of light entering the eye. It can dilate or constrict in response to changes in lighting conditions. When there is a lot of light, the pupil constricts to reduce the amount of light entering the eye. Conversely, in low light conditions, the pupil dilates to allow more light in. Therefore, the correct answer is that the pupil controls the amount of light entering the eye.Rate this question:
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- 5.
What do rods do?
- A.
Make black and white vision possible.
- B.
Make colour vision possible.
- C.
Make the image flip around.
Correct Answer
A. Make black and white vision possible.Explanation
Rods are photoreceptor cells in the retina of the eye that are responsible for vision in low light conditions. They are more sensitive to light than cones, which are responsible for color vision. Rods contain a pigment called rhodopsin that allows them to detect and respond to light. This pigment is not sensitive to different wavelengths of light, so rods are unable to perceive color. Therefore, rods are responsible for black and white vision, allowing us to see in dimly lit environments.Rate this question:
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- 6.
Cones let you see in colour.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Cones are photoreceptor cells in the retina of the eye that are responsible for detecting and perceiving colors. They are sensitive to different wavelengths of light and help us distinguish between different colors. Without cones, our vision would be limited to shades of gray, and we would not be able to see the vibrant and diverse range of colors that we do. Therefore, the statement "Cones let you see in color" is true.Rate this question:
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- 7.
The optic nerve sends the electrical signals to the brain.
- A.
False
- B.
True
Correct Answer
B. TrueExplanation
The optic nerve is responsible for transmitting electrical signals from the retina to the brain. These signals carry visual information that is processed by the brain to create our sense of sight. Therefore, it is correct to say that the optic nerve sends electrical signals to the brain.Rate this question:
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- 8.
The ciliary muscles control...
- A.
The amount of light going into the eye
- B.
The rods
- C.
The lens shape
- D.
The cones
Correct Answer
C. The lens shapeExplanation
The ciliary muscles control the shape of the lens in the eye. When these muscles contract, the lens becomes thicker, allowing for near vision. When the muscles relax, the lens becomes thinner, allowing for distant vision. By adjusting the shape of the lens, the ciliary muscles help to focus light onto the retina, resulting in clear vision at different distances.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Aug 01, 2015Quiz Created by
Schoolgabby
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