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NEET2006ZoologyNeural Control and CoordinationActual

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

Options

  1. ACell A is the rod cell found evenly all over retina
  2. BCell A is the cone cell more concentrated in the fovea centralis
  3. CCell B is concerned with colour vision in bright light
  4. DCell A is sensitive to low light intensities

Correct answer

B. Cell A is the cone cell more concentrated in the fovea centralis

Step-by-step 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.

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