Question

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3) ‘In the absence of microorganisms the earth would become a heap of dead
plants and animals.’ Justity this statement.

4) Munna observes that the yield of wheat, growing in his field, has reduced
in the current year. He gets the soil tested and the report cunfirms the
deficiency of one particular nutrient. Accordingly, he is advised to grow
peas after harvesting wheat.

(i) Name the nutrient found insufficient.
(ii) How do you think growing peas will help in replenishing the sail?

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Class: 8
Chapter - 02 ; Microorganisms: Friends Or Foes
Subject: Biology
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Answer 1

Answer:

answer 3 - In the absence of microorganisms the earth would become a heap of dead plants and animals , because microorganisms helps in decomposing of the dead plants and animals , they work as a de-composers, without them there will be no decomposing of the dead organisms , and hence lead to the health problems.

Answer 2

★Question 1:-

In the absence of microorganisms the earth would become a heap of dead plants and animals.’ Justity this statement.

Ans:- Microorganisms help in decomposing dead organic matter in the form of decaying plants and sometimes dead animals on the ground. Without them there will be no decomposition of this dead organic matter. Therefore, in the absence of microorganisms the earth would become a heap of dead plants and animals.

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★Question 2:-

Munna observes that the yield of wheat, growing in his field, has reduced in the current year. He gets the soil tested and the report confirms the deficiency of one particular nutrient. Accordingly, he is advised to grow peas after harvesting wheat.

• Name the nutrient found insufficient.
• How do you think growing peas will help in replenishing the sail?

Ans:- For the first question:-

• Nitrogen is the nutrient insufficient in his soil

For the second question:-

• Growing peas can replenish the soil as it contains a bacterium Rhizobium which lives in the root nodules of the pea plant, Hence, it can help in the fixing the nitrogen from air into soil and increase the soil fertility.

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Hope it's helpful :)