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problem 1) Complete the sentence below using the three most appropriate words from the list.

A  …..(A) ….. such as touch, is detected by a ….. (B) ….. and we may make a ….. (C) ….. . .

response, change, organ, stimulus, movement, receptor, effector

problem 2) List four stimuli which can be detected by the skin.

problem 3) By what means do we become aware of a stimulus?

problem 4) Name the four taste sensations that we can distinguish.

problem 5) Which one of  the following statements is incorrect?

When a bright light shines in the eye

(a) impulses travel in the optic nerve

(b) the radial fibres in the iris contract.

(c) the retina responds

(d) the pupil becomes smaller. 

problem 6) What is the cause of the blind spot in the field of vision?

(a) There are no nerves in the blind spot.

(b) There are only cones in the blind spot.

(c) There are no sensory cells in the blind spot.

(d) The image is not formed on the blind spot.

problem 7)(a) Which region of the retina gives the most accurate interpretation of the image?

(b) What type of light-sensitive cell is present in this region?

problem 8) Which parts of the eye refract ('bend') the light in such a way as to form an image on the retina?

problem 9)(a) What do you understand by the term 'accommodation'?

(b) What part does the lens play in this process?

problem 10) Which is the correct statement?

To focus a distant object

(a) the ciliary muscle contracts and the lens gets thicker

(b) the ciliary muscle relaxes and the lens gets thinner

(c) the ciliary muscle contracts and the lens gets thinner

(d) the ciliary muscle relaxes and the lens gets thicker.

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