Fill in the blanks. 

(a) [[1]] is caused by deficiency of Vitamin D. 

(b) Deficiency of [[2]] causes a disease known as beri-beri. 

(c) Deficiency of Vitamin C causes a disease known as [[3]]. 

(d) Night blindness is caused due to deficiency of [[4]] in our food.

The following are the answers of fill in the blanks:

(a)    Rickets is caused by deficiency of Vitamin D. 

Vitamin D deficiency causes disease called Rickets where bones become soft and bent.

(b)   Deficiency of Vitamin B1 causes a disease known as beri-beri. 

Vitamin B1 deficiency causes Beri-Beri in which muscles get weak.

(c)    Deficiency of Vitamin C causes a disease known as Scurvy. 

Vitamin C deficiency causes disease called Scurvy where gums bleed.

(d)   Night blindness is caused due to deficiency of Vitamin A in our food.

Vitamin A deficiency causes disease called Night blindness where eye vision gets affected.