Case: Observe the image given below. There are two test tubes (i) and (ii). Test tube (i) contains a starch solution, while test tube (ii) contains starch solution and saliva. Both the test tubes are kept undisturbed for about 20 min. Later, dilute iodine solution (brown in colour) was added to both the test tubes.

Which among the following enzymes is present in saliva?

[0.8 Mark]

Pepsin

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Amylase

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Trypsin

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Lipase

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Solution

The correct option is B Amylase
Saliva contains an enzyme called salivary amylase. It is responsible for breaking down starch into simple sugars.

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Q. Case: Observe the image given below. There are two test tubes (i) and (ii). Test tube (i) contains a starch solution, while test tube (ii) contains starch solution and saliva. Both the test tubes are kept undisturbed for about 20 min. Later, dilute iodine solution (brown in colour) was added to both the test tubes.

In which part of the alimentary canal does the digestion of food begin?

[0.8 Mark]

Option	Test tube (i)	Test tube (ii)
A.	Blue-black	Brown
B.	Brown	Blue-black
C.	Blue-black	Blue-black
D.	Brown	Brown

[0.8 Mark]

We have two test tubes here, X and Y. X contains boiled rice and Y contains boiled rice that has been completely chewed on. Which one is more likely to turn blue-black on adding an iodine solution?

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A dilute solution of sodium carbonate was added to two test tubes - one containing dilute $H C l$ (A) and the other containing dilute $N a O H$ (B). The correct observation was

Q. In a test tube containing dilute starch, solution saliva is added kept at pH 2.8 and temp 38

^{o}

C. After half an hour, a drop of iodine is added and it is found that solution turns

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The correct option is B AmylaseSaliva contains an enzyme called salivary amylase. It is responsible for breaking down starch into simple sugars.

The correct option is B Amylase
Saliva contains an enzyme called salivary amylase. It is responsible for breaking down starch into simple sugars.