CBSE Class 10 Science 2022 Delhi Term II Set 1

Question : 7

Total: 15

In the following food chain, only 2J of energy was available to the peacoks. How much energy would been present in Grass? Justify your answer.
GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK
OR
(a) What is meant by garbage? List two classes into which garbage is classified.
(b) What do we actually mean when we say that the "enzymes are specific in their action"?

Solution:

At each level of the food chain, only 10% of the total energy is transferred to the next level. Hence, by this 10% law, if peacock had 2J energy, snake had 20J(10% of 20=2), frog had 200J, grasshopper had 2000J and grass had 20,000J of energy.
OR
(a) The unwanted things or substances which are generated during various activities and processes in day-to-day lives constitute the garbage. Garbage is classified into the following two classes:
1. Biodegradable: That can be decomposed by microbes.
2. Non-biodegradable: That cannot be decomposed by microbes.
(b) It means that a particular enzyme works on or with particular substances. Specific enzymes are needed for the break down of a particular substance. For example, lipase will digest only lipids and not proteins. Also, enzymes have a specific site and mechanism of action in the body.

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