In a school practical, three test tubes, A, B and C were kept in front of a student. “A” has some rice water in it, “B” has egg white in it and “C” has ghee in it. The teacher gave three chemical bottles to the student and asked to pour them into respective test tubes such that those contents can be broken down into simpler forms.
[One bottle per test tube must be used]

Bottle 1 contains an enzyme that is secreted inside the mouth.

Bottle 2 contains an enzyme that is secreted by the pancreas

Bottle 3 contains an enzyme that is secreted by the stomach.
Can you help in choosing the correct chemicals to digest the substances in the test tubes? [3 Marks]

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Solution

Chemical digestion is a process involving specific enzymes which acts on specific substrate molecules.

Chemical digestion starts in the mouth, continues in stomach and ends in the small intestine.

Bottle 1 contains salivary amylase which acts on rice water in test tube A. Rice water contains starch which is acted upon by the enzyme salivary amylase.

Bottle 2 contains lipase which acts on ghee in test tube C. Ghee is a source of fats.

Bottle 3 contains pepsin which acts on egg white in test tube B. Egg white is a source of proteins.

So the correct match is:
Bottle 1 (Salivary amylase) - Test tube A
Bottle 2 (Lipase) - Test tube C
Bottle 3 (Pepsin) - Test tube B

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In a school practical, three test tubes, A, B and C were kept in front of a student. “A” has some starch in it, “B” has protein powder in it and “C” has fats in it. The teacher gave three chemical bottles to the student and asked to pour them into respective test tubes such that those contents can be broken down into simpler forms.
[One bottle per test tube must be used]

•Bottle 1 contains an enzyme that is secreted inside the mouth.
•Bottle 2 contains an enzyme that is secreted by the pancreas
•Bottle 3 contains an enzyme that is secreted by the stomach.
•

Can you help in choosing the correct chemicals to digest the substances in the test tubes?

In a school practical, three test tubes, A, B, and C were kept in front of a student. “A” has some starch in it, “B” has protein powder in it and “C” has fats in it. The teacher gave three chemical bottles to the student and asked to pour them into respective test tubes such that those contents can be broken down into simpler forms.
[One bottle per test tube must be used]

Q. The diagram alongside shows two test tubes

A

and

B

. Test tube

A

contains a green water plant. Test tube

B

contains both, a green water plant and a snail. Both test tubes are kept in sunlight. Answer the questions that follows.

(v) Give an example of a water plant, that can be used in the above experiment.

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