Question

what is the cause of vitamin A deficiency
(1) beri-beri
(2) scurvy
(3) rickets
(4) blindness ​

Answer 1

Blindness is caused by vitamin A deficiency.

• Vitamin A (retinol) is necessary for synthesis of retinol pigments which are required for dark adaptation of the eyes.

• It is necessary for vision in dim light.

• The main sources of these vitamin is leafy vegetables like spinach, cabbage, orange, pumpkin, papaya and other animal sources like fish liver, egg, butter, cheese, etc.

• Apart from blindness , the main deficiency symptoms are are keratomalacia, xerophthalmia, dryness of the skin and dryness of the conjunctiva.

• For prophylaxis , amount of vitamin A to be taken is 4000 IU/day.

Other options are eliminated:

• Beri-Beri is caused by deficiency of vitamin B1.

• Scurvy is caused by deficiency of vitamin C.

• Rickets is caused by deficiency of vitamin D.

$\star$ Hope It Helps.

Answer 2

Blindness is caused because of Vitamin A deficiency.

So, the right choice is option (4)

When vitamin A decreases in an individual's body then the person suffers from night blindness. This disease is also called Nyctalopia.

Malabsorption of fat, disorders of liver can cause deficiency of Vitamin A in our body.

People who suffers from night blindness has poor vision in dim environment or at night.

We can obtain Vitamin A by intaking dairy products, fish, carrots, etc.

Deficiency symptoms of some elements :

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