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The diagram shows a section through the human eye - Leaving Cert Biology - Question a - 2014

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The diagram shows a section through the human eye. (i) Name the parts labelled A and B. (ii) Name and give a function of the coloured part of the eye. (iii) The e... show full transcript

Worked Solution & Example Answer:The diagram shows a section through the human eye - Leaving Cert Biology - Question a - 2014

Step 1

(i) Name the parts labelled A and B.

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Answer

A is the Retina and B is the Lens.

Step 2

(ii) Name and give a function of the coloured part of the eye.

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Answer

The coloured part of the eye is called the iris. Its function is to control the amount of light entering the eye by adjusting the size of the pupil.

Step 3

(iii) The eye is filled with fluid. What is the function of this fluid?

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Answer

The fluid in the eye helps to give shape to the eye and can also support the lens or transmit light.

Step 4

(iv) Explain in detail how the eye works.

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Answer

The eye functions by allowing light to enter through the cornea, which begins the focusing process. Light then passes through the pupil, with the iris controlling its size to adjust the amount of light entering. The lens further focuses the light onto the retina at the back of the eye. The retina contains photoreceptor cells, called rods and cones, which convert the light into electrical signals. These signals are then transmitted via the optic nerve to the brain, which processes them into visual images. Additionally, the eye has mechanisms for accommodation, allowing us to focus on objects at varying distances.

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