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Experiments on Digestion

Given below a...

Question

Given below are the steps to test the presence of proteins in a food item.

(i) Take a small quantity of the food item in a test tube, add 10 drops of water to it and shake it.

(ii) Make a paste or powder of food to be tested.

(iii) Add 10 drops of caustic soda solution to the test tube and shake well.

(iv) Add 2 drops of copper sulphate solution to it.

Which of the following is the correct sequence of steps?

(a) i, ii, iv, iii

(b) ii, i, iv, iii

(c) ii, i, iii, iv

(d) iv, ii, i, iii

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Solution

The answer is (b).

The presence of proteins in a food material is tested on the basis of a reaction between proteins and alkaline solution of copper sulphate, that gives a violet colour. The test involves the following steps in sequences - ii $\to$ i $\to$ iv $\to$ iii , that is

(ii) Make a paste or powder of food to be tested.

(i) Take a small quantity of the food item in a test tube, add 10 drops of water to it and shake it.

(iv) Add 2 drops of copper sulphate solution to it.

(iii) Add 10 drops of caustic soda solution to the test tube and shake well.

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Q. A student takes Cu, Al, Fe and Zn pieces separately in four test tubes labelled as I, II, III, and IV respectively. He adds 10 mL of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.

He would observe a black residue in the test tubes :
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Q. Question 1
Given below from (i) to (iv) are some food items.

(i) Boiled and mashed potato
(ii) Glucose solution
(iii) A slice of bread
(iv) Mustard oil

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(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)

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(1) I and III
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Q. A student took four test-tubes I, II, III and IV containing aluminium sulphate, copper sulphate, ferrous sulphate and zinc sulphate solutions respectively. He placed iron strips in each one of them. After some time, he found a brown deposit formed in test-tube marked :

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Question 4

Read the food items given below.

(i) Wheat

(ii) Ghee

(iii) Iodised salt

(iv) Spinach

Which of the above food items are "energy giving foods"?

(a) (i) and (iv)

(b) (ii) and (iv)

(c) (i) and (ii)

(d) (iii) and (iv)

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Experiments on Digestion

Standard IX Biology

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