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Mention the role of iris in the human ey...

Mention the role of iris in the human eye.

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iri controls the size of the pupil and hence regulates the amount of light entering the eye.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - VERY SHORT ANSWER TYPE QUESTIONS
  1. Mention the function of eye lens.

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  2. Where does refraction of light rays occur in the human eye ?

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  3. Mention the role of iris in the human eye.

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  4. Which are the light-sensitive cells present in the retina of the human...

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  5. Which nerves carry electrical signals from the light-sensitive cells o...

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  6. Which are the light-sensitive cells present in the retina of the human...

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  7. What is iris?

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  8. Which part of the eye generates electric signals ?

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  9. What is blind spot ?

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  10. What is the function of pupil of the human eye ?

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  11. Which muscles help in changing the shape of the eye lens ?

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  12. State one point of similarity between the image formed by the human ey...

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  13. Why are we not able to see the things clearly when we come out of a dr...

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  14. why does it take some time to see objects in a cinema hall when we jus...

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  15. Define the least distance of distinct vision. What is its value ?

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  16. How is cataract caused ? How is it cured ?

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  17. Mention one advantage of having two eyes instead of one.

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  18. How do the eyes of a tiger difer from that of a rabbit ?

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  19. What is the main advantage of having two eyes in front of the head ?

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  20. A person can see nearby objects clearly but distant objects appear blu...

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