The diagram shows the human eye - Leaving Cert Biology - Question 15 - 2009
Question 15
The diagram shows the human eye.
(i) Name the parts labelled V, W and X.
(ii) Give the functions of parts Y and Z.
(iii) 1. Suspensory ligaments. 2. Cones. 3. Opt... show full transcript
Worked Solution & Example Answer:The diagram shows the human eye - Leaving Cert Biology - Question 15 - 2009
Step 1
Name the parts labelled V, W and X.
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Answer
V = Iris
W = Pupil
X = Choroid
Step 2
Give the functions of parts Y and Z.
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Answer
Function of Y (Lens): To focus (light) onto the retina.
Function of Z (Vitreous Humour): Gives shape to the eye.
Step 3
Outline the roles in vision of any three of the above structures.
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Suspensory ligaments: Holds lens in place and is involved in changing the shape of the lens.
Cones: Detects color and is essential for color vision.
Optic nerve: Brings impulses from the retina to the brain.
Step 4
Explain how the iris works.
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The iris (muscular contraction) controls the amount of light entering the eye by adjusting the size of the pupil in response to light intensity.
Step 5
Suggest a reason why two eyes are better than one.
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Having two eyes increases the visual field and enables better depth perception, allowing for more accurate judgment of distances.
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