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Question (11)

QN0029243

A farmer grows leguminous plants to naturally improve soil fertility. This mainly helps increase the amount of:

(A) oxygen
(B) carbon dioxide
(C) nitrogen
(D) hydrogen

Correct Answer: C

Explanation:

Nitrogen-fixing bacteria increase soil nitrogen.

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Question (12)

QN0029244

Which part of a plant cell gives it rigidity and a fixed shape?

(A) Cytoplasm
(B) Cell membrane
(C) Cell wall
(D) Nucleus

Correct Answer: C

Explanation:

Cell wall provides support and rigidity.

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Question (13)

QN0029245

A doctor advises refrigeration of cooked food mainly because low temperature:

(A) increases microbial growth
(B) slows down microbial activity
(C) increases moisture
(D) converts food into nutrients

Correct Answer: B

Explanation:

Cold conditions reduce microbial growth.

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Question (14)

QN0029246

If 4 litres of milk produce 800 g curd, how much curd can be prepared from 15 litres of milk under similar conditions?

(A) 1500 g
(B) 2400 g
(C) 3000 g
(D) 3600 g

Correct Answer: C

Explanation:

800 ÷ 4 = 200 g per litre; 200 × 15 = 3000 g.

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Question (15)

QN0029247

Which scientist first observed cork cells using a microscope?

(A) Fleming
(B) Hooke
(C) Pasteur
(D) Darwin

Correct Answer: B

Explanation:

Robert Hooke observed cork cells.

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Question (16)

QN0029248

Which of the following is an example of an organ system?

(A) Heart
(B) Blood
(C) Digestive system
(D) Muscle tissue

Correct Answer: C

Explanation:

Organ systems consist of several organs working together.

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Question (17)

QN0029249

A student notices fungal growth on moist bread kept outside for several days. This observation shows that microorganisms grow well in:

(A) dry conditions
(B) moist conditions
(C) vacuum
(D) freezing conditions

Correct Answer: B

Explanation:

Moisture supports microbial growth.

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Question (18)

QN0029250

If 250 bacteria become 1000 after a few hours, the population has increased by a factor of:

(A) 2
(B) 3
(C) 4
(D) 5

Correct Answer: C

Explanation:

1000 ÷ 250 = 4.

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Question (19)

QN0029251

Which structure is known as the control centre of the cell?

(A) Cell membrane
(B) Cytoplasm
(C) Nucleus
(D) Cell wall

Correct Answer: C

Explanation:

The nucleus controls all cell activities.

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Question (20)

QN0029252

Which of the following best explains the connection between humans and microbes?

(A) Microbes are useful only in causing diseases
(B) Microbes help in food preparation, medicine, and decomposition
(C) Microbes destroy all useful materials
(D) Humans cannot survive near microbes

Correct Answer: B

Explanation:

Many microbes are beneficial to humans and the environment.

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Question (11)

A farmer grows leguminous plants to naturally improve soil fertility. This mainly helps increase the amount of:

Explanation:

Link:

Question (12)

Which part of a plant cell gives it rigidity and a fixed shape?

Explanation:

Link:

Question (13)

A doctor advises refrigeration of cooked food mainly because low temperature:

Explanation:

Link:

Question (14)

If 4 litres of milk produce 800 g curd, how much curd can be prepared from 15 litres of milk under similar conditions?

Explanation:

Link:

Question (15)

Which scientist first observed cork cells using a microscope?

Explanation:

Link:

Question (16)

Which of the following is an example of an organ system?

Explanation:

Link:

Question (17)

A student notices fungal growth on moist bread kept outside for several days. This observation shows that microorganisms grow well in:

Explanation:

Link:

Question (18)

If 250 bacteria become 1000 after a few hours, the population has increased by a factor of:

Explanation:

Link:

Question (19)

Which structure is known as the control centre of the cell?

Explanation:

Link:

Question (20)

Which of the following best explains the connection between humans and microbes?

Explanation:

Link:

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