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Question (21)

QN0034522

Why is biodiversity considered a benefit of healthy ecosystems?

(A) It supports stability and resilience.
(B) It increases pollution.
(C) It prevents nutrient cycling.
(D) It removes habitats.

Correct Answer: A

Explanation:

Biodiversity helps ecosystems remain stable.

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Question (22)

QN0034523

A wetland supports 240 bird species and 160 fish species. How many species are supported altogether?

(A) 360
(B) 380
(C) 400
(D) 420

Correct Answer: C

Explanation:

240 + 160 = 400.

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Question (23)

QN0034524

Which ecosystem benefit helps reduce carbon dioxide in the atmosphere?

(A) Photosynthesis by plants
(B) Predation
(C) Camouflage
(D) Hibernation

Correct Answer: A

Explanation:

Plants absorb carbon dioxide during photosynthesis.

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Question (24)

QN0034525

If 600 kg of carbon dioxide is absorbed by plants and 150 kg remains unabsorbed, what was the total amount initially present?

(A) 650 kg
(B) 700 kg
(C) 750 kg
(D) 800 kg

Correct Answer: C

Explanation:

600 + 150 = 750 kg.

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Question (25)

QN0034526

Which ecosystem service directly supports agriculture?

(A) Pollination
(B) Erosion
(C) Landslides
(D) Deforestation

Correct Answer: A

Explanation:

Pollination helps crop production.

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Question (26)

QN0034527

A group of bees pollinates 72 flowers in one hour. How many flowers will they pollinate in 5 hours at the same rate?

(A) 300
(B) 320
(C) 360
(D) 400

Correct Answer: C

Explanation:

72 × 5 = 360.

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Question (27)

QN0034528

Which ecosystem benefit helps clean dead organic matter from the environment?

(A) Decomposition
(B) Competition
(C) Adaptation
(D) Migration

Correct Answer: A

Explanation:

Decomposition breaks down dead matter.

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Question (28)

QN0034529

A decomposer community breaks down 240 kg of leaf litter in 8 days. What is the average amount decomposed per day?

(A) 25 kg
(B) 30 kg
(C) 35 kg
(D) 40 kg

Correct Answer: B

Explanation:

240 ÷ 8 = 30 kg.

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Question (29)

QN0034530

Which ecosystem benefit helps maintain groundwater levels?

(A) Water infiltration into soil
(B) Plastic accumulation
(C) Air pollution
(D) Soil sealing

Correct Answer: A

Explanation:

Water entering the soil replenishes groundwater.

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Question (30)

QN0034531

A region receives 900 mm of rainfall. If 300 mm infiltrates into the ground, what fraction of rainfall enters the soil?

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

Correct Answer: B

Explanation:

300/900 = 1/3.

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Question (21)

Why is biodiversity considered a benefit of healthy ecosystems?

Explanation:

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Question (22)

A wetland supports 240 bird species and 160 fish species. How many species are supported altogether?

Explanation:

Link:

Question (23)

Which ecosystem benefit helps reduce carbon dioxide in the atmosphere?

Explanation:

Link:

Question (24)

If 600 kg of carbon dioxide is absorbed by plants and 150 kg remains unabsorbed, what was the total amount initially present?

Explanation:

Link:

Question (25)

Which ecosystem service directly supports agriculture?

Explanation:

Link:

Question (26)

A group of bees pollinates 72 flowers in one hour. How many flowers will they pollinate in 5 hours at the same rate?

Explanation:

Link:

Question (27)

Which ecosystem benefit helps clean dead organic matter from the environment?

Explanation:

Link:

Question (28)

A decomposer community breaks down 240 kg of leaf litter in 8 days. What is the average amount decomposed per day?

Explanation:

Link:

Question (29)

Which ecosystem benefit helps maintain groundwater levels?

Explanation:

Link:

Question (30)

A region receives 900 mm of rainfall. If 300 mm infiltrates into the ground, what fraction of rainfall enters the soil?

Explanation:

Link:

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