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Question (31)

QN002871

Why is warm water preferred while preparing dough with yeast?

(A) It kills microorganisms
(B) It improves yeast growth and activity
(C) It hardens the dough
(D) It removes sugar

Correct Answer: B

Explanation:

Yeast grows well in warm conditions.

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Question (32)

QN002872

A student keeps curd mixture in a refrigerator and another in a warm place. Curd forms faster in the warm place because bacteria:

(A) become inactive in warmth
(B) grow better in warm conditions
(C) require freezing conditions
(D) stop fermentation at higher temperature

Correct Answer: B

Explanation:

Warm temperature supports bacterial growth.

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Question (33)

QN002873

Rhizobium bacteria are important because they:

(A) produce alcohol
(B) cause decay of food
(C) fix atmospheric nitrogen
(D) destroy root cells

Correct Answer: C

Explanation:

Rhizobium converts atmospheric nitrogen into usable form.

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Question (34)

QN002874

Farmers often grow legumes with other crops because legumes help:

(A) reduce sunlight
(B) increase nitrogen content of soil
(C) remove all microbes from soil
(D) dry the soil rapidly

Correct Answer: B

Explanation:

Legumes enrich soil with nitrogen.

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Question (35)

QN002875

Fruit and vegetable peels convert into manure due to the action of:

(A) sunlight only
(B) fungi and bacteria
(C) oxygen alone
(D) chlorophyll

Correct Answer: B

Explanation:

Microorganisms decompose waste into manure.

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Question (36)

QN002876

If microorganisms suddenly disappeared from Earth, one major effect would be:

(A) faster decomposition
(B) accumulation of dead waste materials
(C) increase in oxygen production
(D) complete stoppage of rainfall

Correct Answer: B

Explanation:

Waste would accumulate because decomposition would stop.

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Question (37)

QN002877

Which microorganism is commonly called a “superfood” due to its high protein content?

(A) Amoeba
(B) Spirulina
(C) Yeast
(D) Paramecium

Correct Answer: B

Explanation:

Spirulina is rich in protein and nutrients.

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Question (38)

QN002878

Spirulina contains protein amounting to more than approximately:

(A) 10% of body weight
(B) 25% of body weight
(C) 40% of body weight
(D) 60% of body weight

Correct Answer: D

Explanation:

Spirulina contains more than 60% protein.

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Question (39)

QN002879

Bacterial cells differ from plant and animal cells because bacteria lack:

(A) cytoplasm
(B) cell membrane
(C) well-defined nucleus
(D) rib-like structures

Correct Answer: C

Explanation:

Bacteria have a nucleoid instead of a true nucleus.

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Question (40)

QN002880

Which statement correctly explains why the cell is called the basic unit of life?

(A) Cells are visible without microscopes
(B) Every living organism is made up of cells that perform life functions
(C) Cells are found only in plants
(D) Cells cannot survive independently

Correct Answer: B

Explanation:

Cells are the structural and functional units of life.

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Question (31)

Why is warm water preferred while preparing dough with yeast?

Explanation:

Link:

Question (32)

A student keeps curd mixture in a refrigerator and another in a warm place. Curd forms faster in the warm place because bacteria:

Explanation:

Link:

Question (33)

Rhizobium bacteria are important because they:

Explanation:

Link:

Question (34)

Farmers often grow legumes with other crops because legumes help:

Explanation:

Link:

Question (35)

Fruit and vegetable peels convert into manure due to the action of:

Explanation:

Link:

Question (36)

If microorganisms suddenly disappeared from Earth, one major effect would be:

Explanation:

Link:

Question (37)

Which microorganism is commonly called a “superfood” due to its high protein content?

Explanation:

Link:

Question (38)

Spirulina contains protein amounting to more than approximately:

Explanation:

Link:

Question (39)

Bacterial cells differ from plant and animal cells because bacteria lack:

Explanation:

Link:

Question (40)

Which statement correctly explains why the cell is called the basic unit of life?

Explanation:

Link:

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