The function of the iris in the eyes of a frog is to

  • A
    Alter the size of the pupil
  • B
    Move the nictitating membrane
  • C
    Refract and regulate light rays
  • D
    Move the lens forward and backward

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The following figure is a diagram showing parts of the human eye. Identify $P, Q$,and $R$ from the options given below.
$\quad\quad P\quad\quad\quad Q\quad\quad\quad R$

The transparent lens in the human eye is held in its place by:

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Macula lutea is present in.

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