Question

Night blindness is caused due to the deficiency of
(a) Vitamin C
(b) Vitamin A
(c) Vitamin D
(d) Vitamin E

Answer 1

Hint: Lack of adequate supply of nutrients in proper proportion in diet can result in different nutritional disorders and other deficiency disorders. Deficiency of different nutrients and vitamins express themselves as different symptoms in our body. So it is very important to take vitamin supplements accordingly.

complete answer:
-Night blindness or nyctalopia generally refers to a lack of proper vision at night.it can also occur in dim light.
-Eyes require more time to get adapted when going from an area of light to dark places.
-Due to the deficiency or lack of Vitamin A night blindness occurs.
-Deficiency of Vitamin A causes less rhodopsin IN rod cells of the retina. So, the person will have less vision in dim light.
-Night blindness can be cured naturally by consuming vitamin A-rich foods like green leafy vegetables, carrots, fish, dairy products.
-Night blindness gets more severe as age advances, as they allow less light to pass through.

So the correct answer is option B.

Additional information:
-Xerophthalmia is another deficiency disease of Vitamin A. In this case, there is thickened, keratinized, opaque, ulcerated cornea. It is the prime cause of blindness in India, especially among children.
-Vitamin C deficiency causes scurvy in which blood vessels get fragile due to defective collagen fibers in their walls. Bleeding gums and teeth fall are other symptoms.
-The deficiency of Vitamin D causes rickets in children while osteomalacia in adults. A condition called pigeons breast is also caused by its deficiency.
-Vitamin E deficiency causes difficulty in walking, muscle pain, and other visual disturbances.

Note: Excess vitamins can also cause various disorders. This condition is called overnutrition. Fluorosis, obesity constipation, hypervitaminosis, hypercholesterolemia are some of them.