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Question (11)

QN0034512

A compost pit converts 150 kg of organic waste into 50 kg of compost. What fraction of the original waste becomes compost?

(A) 1/2
(B) 1/3
(C) 1/4
(D) 1/5

Correct Answer: B

Explanation:

50/150 = 1/3.

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Question (12)

QN0034513

Which ecosystem benefit helps prevent floods by absorbing excess rainwater?

(A) Wetlands
(B) Deserts
(C) Mountains only
(D) Rocks only

Correct Answer: A

Explanation:

Wetlands absorb and store excess water.

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Question (13)

QN0034514

If a wetland absorbs 4,500 litres of excess rainwater and releases 1,200 litres later, how much water remains stored?

(A) 3000 L
(B) 3200 L
(C) 3300 L
(D) 3500 L

Correct Answer: C

Explanation:

4500 − 1200 = 3300 L.

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Question (14)

QN0034515

Why are forests considered important ecosystem resources?

(A) They provide food, oxygen, and habitat.
(B) They stop all rainfall.
(C) They prevent decomposition.
(D) They eliminate biodiversity.

Correct Answer: A

Explanation:

Forests provide many ecosystem benefits.

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Question (15)

QN0034516

The exact meaning of “ecosystem services” is ________.

(A) harmful effects of ecosystems
(B) benefits provided by ecosystems
(C) only economic products
(D) only food resources

Correct Answer: B

Explanation:

Ecosystem services are benefits obtained from ecosystems.

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Question (16)

QN0034517

A forest supplies 480 medicinal plants annually. If 25% are used for medicines, how many plants are used?

(A) 100
(B) 110
(C) 120
(D) 140

Correct Answer: C

Explanation:

25% of 480 = 120.

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Question (17)

QN0034518

Which ecosystem benefit helps maintain soil fertility?

(A) Nutrient recycling
(B) Soil erosion
(C) Flooding
(D) Pollution

Correct Answer: A

Explanation:

Nutrient recycling keeps soil fertile.

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Question (18)

QN0034519

A farmer harvests 360 kg of crops due to effective pollination. If pollination contributes to 180 kg of this yield, what fraction of the harvest is due to pollination?

(A) 1/4
(B) 1/3
(C) 1/2
(D) 2/3

Correct Answer: C

Explanation:

180/360 = 1/2.

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Question (19)

QN0034520

Which ecosystem provides habitat for the greatest variety of organisms among the following?

(A) Forest
(B) Plastic landfill
(C) Concrete road
(D) Empty building

Correct Answer: A

Explanation:

Forests support rich biodiversity.

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Question (20)

QN0034521

A forest contains 2,000 trees. If 15% are fruit-bearing, how many fruit-bearing trees are present?

(A) 250
(B) 300
(C) 350
(D) 400

Correct Answer: B

Explanation:

15% of 2000 = 300.

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Question (11)

A compost pit converts 150 kg of organic waste into 50 kg of compost. What fraction of the original waste becomes compost?

Explanation:

Link:

Question (12)

Which ecosystem benefit helps prevent floods by absorbing excess rainwater?

Explanation:

Link:

Question (13)

If a wetland absorbs 4,500 litres of excess rainwater and releases 1,200 litres later, how much water remains stored?

Explanation:

Link:

Question (14)

Why are forests considered important ecosystem resources?

Explanation:

Link:

Question (15)

The exact meaning of “ecosystem services” is ________.

Explanation:

Link:

Question (16)

A forest supplies 480 medicinal plants annually. If 25% are used for medicines, how many plants are used?

Explanation:

Link:

Question (17)

Which ecosystem benefit helps maintain soil fertility?

Explanation:

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Question (18)

A farmer harvests 360 kg of crops due to effective pollination. If pollination contributes to 180 kg of this yield, what fraction of the harvest is due to pollination?

Explanation:

Link:

Question (19)

Which ecosystem provides habitat for the greatest variety of organisms among the following?

Explanation:

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Question (20)

A forest contains 2,000 trees. If 15% are fruit-bearing, how many fruit-bearing trees are present?

Explanation:

Link:

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