Question

Vitamin A deficiency leads to night-blindness. Which of the following is the reason for the disease?

• A. Rod cells are not converted to cone cells
• B. Rhodopsin pigment of rod cells is defective
• C. Melanin pigment is not synthesized in cone cells
• D. Cornea of eye gets dried

Answer 1

The correct option is B Rhodopsin pigment of rod cells is defective

Night blindness (nyctalopia) is an abnormal condition where the individual is unable to see at night. The rods and cones are the photoreceptor cells found in the retina. Rods help in dim light vision. Rhodopsin is a pigment which is present in these cells.The photosensitivity of pigment rhodopsin is impaired that causes night blindness and it may also occur due to deficiency of vitamin A. Thus, the correct answer is option B.