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English 9 · Unit 4: Science · Cambridge Global English Stage 9

4.1 The science of colour

10 questions · e.g. The human eye is lined with a light-sensitive tissue called the ____.

Practice

Questions

  1. 1. The human eye is lined with a light-sensitive tissue called the ____.

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  2. 2. It contains two types of receptors: rods and ____.

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  3. 3. The cones can perceive colours, but only when there is enough ____.

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  4. 4. People have different levels of sensitivity to wavelengths, so ____ may be perceived differently by each person.

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  5. 5. "They have three different colour receptors and can detect red, blue and green." Who are they?

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  6. 6. "They have only two colour receptors. Their eyes only detect blue and green." Who are they?

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  7. 7. "They can detect far more shades of colour than other people because they have four colour receptors." Who are they?

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  8. 8. "This helps them find food." Who are they?

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  9. 9. What does the prefix tri- mean?

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  10. 10. What does the prefix tetra- mean?

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