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Question (11)

QN002961

Which disease can be prevented through vaccination?

(A) Scurvy
(B) Measles
(C) Fracture
(D) Anaemia

Correct Answer: B

Explanation:

Vaccination helps prevent measles.

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Question (12)

QN002962

Which microorganism is mainly involved in nitrogen fixation in leguminous plants?

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

Correct Answer: B

Explanation:

Rhizobium fixes nitrogen in soil.

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Question (13)

QN002963

Farmers grow leguminous crops mainly because these crops:

(A) absorb all soil nutrients
(B) increase soil nitrogen content
(C) reduce rainfall
(D) destroy microbes in soil

Correct Answer: B

Explanation:

Leguminous crops improve soil fertility.

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Question (14)

QN002964

Which process converts dead plants and animals into simpler substances?

(A) Photosynthesis
(B) Respiration
(C) Decomposition
(D) Condensation

Correct Answer: C

Explanation:

Decomposition breaks dead matter into simpler substances.

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Question (15)

QN002965

Decomposition is mainly carried out by:

(A) microorganisms
(B) rocks
(C) insects only
(D) clouds

Correct Answer: A

Explanation:

Microorganisms help in decomposition.

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Question (16)

QN002966

Which microorganism is commonly called a “superfood” because of its high protein content?

(A) Spirulina
(B) Amoeba
(C) Virus
(D) Mushroom

Correct Answer: A

Explanation:

Spirulina is rich in protein.

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Question (17)

QN002967

If one packet of yeast can prepare 5 kg dough, how much dough can 4 packets prepare?

(A) 10 kg
(B) 15 kg
(C) 20 kg
(D) 25 kg

Correct Answer: C

Explanation:

5 × 4 = 20 kg.

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Question (18)

QN002968

A student keeps dough in two places: one warm and one cold. The dough rises faster in the warm place because yeast:

(A) grows actively in warmth
(B) becomes inactive in warmth
(C) dies in warm conditions
(D) stops respiration in warmth

Correct Answer: A

Explanation:

Yeast grows better in warm conditions.

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Question (19)

QN002969

Which of the following best explains fermentation?

(A) Breakdown of food by microorganisms
(B) Formation of clouds
(C) Conversion of liquid into gas
(D) Reflection of light

Correct Answer: A

Explanation:

Fermentation involves microbial breakdown of substances.

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Question (20)

QN002970

If a bacteria population doubles every hour and starts with 200 bacteria, how many bacteria will be present after 3 hours?

(A) 400
(B) 800
(C) 1600
(D) 3200

Correct Answer: C

Explanation:

200 × 2 × 2 × 2 = 1600.

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Question (11)

Which disease can be prevented through vaccination?

Explanation:

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Question (12)

Which microorganism is mainly involved in nitrogen fixation in leguminous plants?

Explanation:

Link:

Question (13)

Farmers grow leguminous crops mainly because these crops:

Explanation:

Link:

Question (14)

Which process converts dead plants and animals into simpler substances?

Explanation:

Link:

Question (15)

Decomposition is mainly carried out by:

Explanation:

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Question (16)

Which microorganism is commonly called a “superfood” because of its high protein content?

Explanation:

Link:

Question (17)

If one packet of yeast can prepare 5 kg dough, how much dough can 4 packets prepare?

Explanation:

Link:

Question (18)

A student keeps dough in two places: one warm and one cold. The dough rises faster in the warm place because yeast:

Explanation:

Link:

Question (19)

Which of the following best explains fermentation?

Explanation:

Link:

Question (20)

If a bacteria population doubles every hour and starts with 200 bacteria, how many bacteria will be present after 3 hours?

Explanation:

Link:

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