Q165 / 180 · AIIMS 2006 · Zoology

Examine the diagram of the two cell types $A$ and $B$ given below and select the correct option Figure

  • A
    Cell A is the rod cell found evenly all over retina
  • Correct answer
    B
    Cell $\mathrm{A}$ is the cone cell more concentrated in the fovea centralis
  • C
    Cell B is concerned with colour vision in bright light
  • D
    Cell A is sensitive to low light intensities

Solution

Cone cell is one of two types (other is rod) of light sensitive cells in the retina of the eye. The human retina contains 6-7 million cones which function best in bright light and are essential for active vision (receiving a sharp accurate image). The area of retina called the fovea contains the greatest concentration of cone. Cones can also distinguish colours. There are 3 types of cone, each sensitive to the wavelength of a different primary colour - red, green or blue.

Hence, the correct answer is option: 'B'.

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