10 (a) Figure 18 shows two light receptor cells from the human eye - Edexcel - GCSE Biology - Question 10 - 2022 - Paper 1
Question 10
10 (a) Figure 18 shows two light receptor cells from the human eye.
(i) Which part of the eye contains light receptor cells?
A cornea
B iris
C lens
D retina
(ii) ... show full transcript
Worked Solution & Example Answer:10 (a) Figure 18 shows two light receptor cells from the human eye - Edexcel - GCSE Biology - Question 10 - 2022 - Paper 1
Step 1
Which part of the eye contains light receptor cells?
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Answer
The part of the eye that contains light receptor cells is the D retina.
Step 2
Name the organelles labelled X.
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Answer
The organelles labelled X are mitochondria.
Step 3
Name the organelle labelled Y.
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The organelle labelled Y is the nucleus.
Step 4
Name cell A.
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Cell A is a rod cell.
Step 5
Describe how the role of light receptor cell B is different from the role of light receptor cell A.
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Answer
Light receptor cell B, which is a cone cell, is responsible for color vision and operates best in bright light. In contrast, light receptor cell A, or the rod cell, is more sensitive to low light levels and is responsible for night vision.
Step 6
Calculate the time an impulse takes to travel the length of the optic nerve.
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Answer
Using the formula: speed = distance / time, we can rearrange it to time = distance / speed. Therefore, time = 47 mm / 75 m/s = 0.0006133333 hours, which converts to approximately 0.000613 seconds.
Step 7
Which part of the brain contains the occipital lobe?
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The part of the brain that contains the occipital lobe is A cerebral hemispheres.
Step 8
State the sense most likely to be affected if the occipital lobe is damaged.
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The sense most likely to be affected if the occipital lobe is damaged is vision.
