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Question (21)

QN0034482

Which organism returns nutrients to the soil after organisms die?

(A) Producer
(B) Herbivore
(C) Decomposer
(D) Predator

Correct Answer: C

Explanation:

Decomposers recycle nutrients into the soil.

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Question (22)

QN0034483

A field has 72 flowering plants visited by 216 bees in a day. On average, how many bee visits occur per plant?

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

Correct Answer: B

Explanation:

216 ÷ 72 = 3.

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Question (23)

QN0034484

Which interaction directly controls herbivore populations?

(A) Predation
(B) Germination
(C) Decomposition
(D) Pollination

Correct Answer: A

Explanation:

Predators help regulate herbivore numbers.

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Question (24)

QN0034485

A population of insects decreases from 150 to 120 due to predation. What fraction of the original population remains?

(A) 2/3
(B) 3/4
(C) 4/5
(D) 5/6

Correct Answer: C

Explanation:

120/150 = 4/5.

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Question (25)

QN0034486

Which process helps maintain nutrient balance in ecosystems?

(A) Decomposition
(B) Migration
(C) Camouflage
(D) Hibernation

Correct Answer: A

Explanation:

Decomposition recycles nutrients.

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Question (26)

QN0034487

If 90 kg of leaf litter decomposes into 30 kg of humus, what fraction of the original mass remains as humus?

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

Correct Answer: B

Explanation:

30/90 = 1/3.

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Question (27)

QN0034488

Which situation best demonstrates mutualism?

(A) Bees obtaining nectar while pollinating flowers
(B) Tiger hunting deer
(C) Two trees competing for light
(D) Fungus decomposing wood

Correct Answer: A

Explanation:

Both bees and flowers benefit.

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Question (28)

QN0034489

A wetland supports 360 birds. If the population increases by 40 birds, what is the new population?

(A) 380
(B) 390
(C) 400
(D) 410

Correct Answer: C

Explanation:

360 + 40 = 400.

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Question (29)

QN0034490

Which interaction may reduce population growth when resources become scarce?

(A) Competition
(B) Pollination
(C) Decomposition
(D) Germination

Correct Answer: A

Explanation:

Competition increases when resources are limited.

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Question (30)

QN0034491

If 25% of 200 insects are removed by predators, how many insects remain?

(A) 100
(B) 125
(C) 150
(D) 175

Correct Answer: C

Explanation:

25% of 200 = 50; 200 − 50 = 150.

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Question (21)

Which organism returns nutrients to the soil after organisms die?

Explanation:

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Question (22)

A field has 72 flowering plants visited by 216 bees in a day. On average, how many bee visits occur per plant?

Explanation:

Link:

Question (23)

Which interaction directly controls herbivore populations?

Explanation:

Link:

Question (24)

A population of insects decreases from 150 to 120 due to predation. What fraction of the original population remains?

Explanation:

Link:

Question (25)

Which process helps maintain nutrient balance in ecosystems?

Explanation:

Link:

Question (26)

If 90 kg of leaf litter decomposes into 30 kg of humus, what fraction of the original mass remains as humus?

Explanation:

Link:

Question (27)

Which situation best demonstrates mutualism?

Explanation:

Link:

Question (28)

A wetland supports 360 birds. If the population increases by 40 birds, what is the new population?

Explanation:

Link:

Question (29)

Which interaction may reduce population growth when resources become scarce?

Explanation:

Link:

Question (30)

If 25% of 200 insects are removed by predators, how many insects remain?

Explanation:

Link:

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