Fill in the blank in the following table:

Vitamin

Name of deficiency disease

Source of vitamin

Function of vitamin

(a) Vitamin A
………….. ………….. …………..

(b)…………..
Beri-beri
………….. …………..

(c) Ascorbic acid
………….. ………….. …………..

(d)…………..
Rickets (in childhood) bones turn soft
………….. …………..

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Solution

Vitamin Name of deficiency disease Source of vitamin Function of vitamin

(a) Vitamin A
Night blindness
Carrot, fish, milk, yellow fruits
Maintains skin and hair

(b) Vitamin B1 Beri-beri Whole grains, egg, nuts
Normal functioning of central nervous system.

(c) Ascorbic acid Scurvy
Citrus fruits, tomatoes

Develops immunity

(d) Vitamin D Rickets (in childhood) bones turn soft
Sunlight, milk, butter
Controls calcium-phosphorus metabolism

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Q. Fill in the blanks in the following table:

Vitamins	Name of deficiency diseases	Source of vitamin
(a) Vitamin A
(b)	Beri-beri
(c) Ascorbic acid
(d)	Rickets (in childhood) bones turn soft

25. A body of mass M falls from a height $H_{1}$ to a height $H_{2}$ , above the ground ( $H_{1} > H_{2}$ ). Then, the loss in its potential energy is given by ____.
A) $M g (H_{1} - H_{2})$
B) $M g (H_{1} + H_{2})$
C) $M g (H_{2} - H_{1})$
D) $M g (H_{1} . H_{2})$

Hydrogen sulphide (H₂S) is a strong reducig agent. Which of the following reactions shows its reducing action

(a) Cd(NO₃)₂+ H₂S --------- CdS+ 2HNO₃
(b) CuSO₄+ H₂S ------------ CuS + H₂SO₄
(c) 2FeCl₃+ H₂S ------------ 2FeCl₂+ 2HCl + S
(d) Pb(NO₃)₂ + H₂S ---------- PbS + 2CH₃COOH

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Sources and functions of Vitamins

Standard VIII Biology

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Vitamin	Name of deficiency disease	Source of vitamin	Function of vitamin
(a) Vitamin A	…………..	…………..	…………..
(b)…………..	Beri-beri	…………..	…………..
(c) Ascorbic acid	…………..	…………..	…………..
(d)…………..	Rickets (in childhood) bones turn soft	…………..	…………..