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Question (21)

QN002941

Which microorganism is commonly used in fermentation for making bakery products?

(A) Rhizobium
(B) Yeast
(C) Amoeba
(D) Algae

Correct Answer: B

Explanation:

Yeast is used in fermentation.

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Question (22)

QN002942

A farmer grows leguminous plants to improve soil fertility because they contain bacteria that:

(A) increase carbon dioxide
(B) absorb oxygen
(C) fix atmospheric nitrogen
(D) remove minerals from soil

Correct Answer: C

Explanation:

Nitrogen-fixing bacteria improve soil fertility.

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Question (23)

QN002943

Which of the following is an example of a beneficial microorganism?

(A) Lactobacillus
(B) Disease-causing virus
(C) Harmful fungus on crops
(D) Mosquito

Correct Answer: A

Explanation:

Lactobacillus is beneficial in curd formation.

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Question (24)

QN002944

If 500 bacteria are present in a culture and their number doubles in one hour, approximately how many bacteria will be present after 3 hours?

(A) 1000
(B) 2000
(C) 4000
(D) 8000

Correct Answer: C

Explanation:

500 × 2 × 2 × 2 = 4000.

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Question (25)

QN002945

Which group of microorganisms includes organisms like Amoeba and Paramecium?

(A) Protozoa
(B) Fungi
(C) Algae
(D) Bacteria

Correct Answer: A

Explanation:

Amoeba and Paramecium are protozoa.

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Question (26)

QN002946

A scientist observes microorganisms moving freely in pond water using hair-like structures. The microorganisms are most likely:

(A) fungi
(B) bacteria
(C) protozoa
(D) algae

Correct Answer: C

Explanation:

Protozoa move using specialised structures.

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Question (27)

QN002947

Which microorganism helps in making idli and dosa batter fluffy?

(A) Amoeba
(B) Yeast
(C) Rhizobium
(D) Mushroom

Correct Answer: B

Explanation:

Yeast releases carbon dioxide making batter fluffy.

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Question (28)

QN002948

If microorganisms responsible for decomposition suddenly disappeared, what would most likely happen?

(A) Dead matter would accumulate
(B) Plants would grow faster instantly
(C) Oxygen level would become zero immediately
(D) Rainfall would stop completely

Correct Answer: A

Explanation:

Dead matter would not decompose.

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Question (29)

QN002949

Which of the following best explains why microorganisms are important in nature?

(A) They only cause diseases
(B) They help in processes like decomposition and fermentation
(C) They destroy all crops
(D) They prevent soil formation

Correct Answer: B

Explanation:

Microorganisms are useful in decomposition and fermentation.

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Question (30)

QN002950

A student observes that dough kept in a warm place rises more than dough kept in a refrigerator. This shows that microorganisms:

(A) grow better in warm conditions
(B) stop respiration in warm conditions
(C) cannot survive in moisture
(D) become inactive in warmth

Correct Answer: A

Explanation:

Warm conditions favour microbial growth.

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Question (21)

Which microorganism is commonly used in fermentation for making bakery products?

Explanation:

Link:

Question (22)

A farmer grows leguminous plants to improve soil fertility because they contain bacteria that:

Explanation:

Link:

Question (23)

Which of the following is an example of a beneficial microorganism?

Explanation:

Link:

Question (24)

If 500 bacteria are present in a culture and their number doubles in one hour, approximately how many bacteria will be present after 3 hours?

Explanation:

Link:

Question (25)

Which group of microorganisms includes organisms like Amoeba and Paramecium?

Explanation:

Link:

Question (26)

A scientist observes microorganisms moving freely in pond water using hair-like structures. The microorganisms are most likely:

Explanation:

Link:

Question (27)

Which microorganism helps in making idli and dosa batter fluffy?

Explanation:

Link:

Question (28)

If microorganisms responsible for decomposition suddenly disappeared, what would most likely happen?

Explanation:

Link:

Question (29)

Which of the following best explains why microorganisms are important in nature?

Explanation:

Link:

Question (30)

A student observes that dough kept in a warm place rises more than dough kept in a refrigerator. This shows that microorganisms:

Explanation:

Link:

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