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Question (31)

QN0034492

Why are food webs generally more stable than simple food chains?

(A) They provide multiple feeding connections.
(B) They contain only producers.
(C) They eliminate predators.
(D) They prevent decomposition.

Correct Answer: A

Explanation:

Multiple connections provide alternative food sources.

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Question (32)

QN0034493

A pond contains 48 frogs and 12 snakes. What is the ratio of frogs to snakes?

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

Correct Answer: C

Explanation:

48 : 12 = 4 : 1.

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Question (33)

QN0034494

Which event is most likely to improve ecosystem balance?

(A) Healthy nutrient recycling
(B) Removal of all predators
(C) Pollution of water sources
(D) Destruction of habitats

Correct Answer: A

Explanation:

Nutrient recycling supports ecosystem stability.

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Question (34)

QN0034495

A forest population of deer rises from 250 to 300. What percentage increase occurs?

(A) 10%
(B) 15%
(C) 20%
(D) 25%

Correct Answer: C

Explanation:

Increase = 50; (50/250) × 100 = 20%.

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Question (35)

QN0034496

Which interaction benefits one organism while harming another?

(A) Mutualism
(B) Parasitism
(C) Pollination
(D) Cooperation

Correct Answer: B

Explanation:

In parasitism, one benefits and the other is harmed.

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Question (36)

QN0034497

In a lake, 420 fish are distributed equally among 14 regions. How many fish are present per region on average?

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

Correct Answer: B

Explanation:

420 ÷ 14 = 30.

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Question (37)

QN0034498

Which factor helps populations avoid growing without limit?

(A) Competition and predation
(B) Unlimited resources
(C) Absence of predators
(D) Continuous food supply

Correct Answer: A

Explanation:

Competition and predation regulate population size.

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Question (38)

QN0034499

A habitat contains 84 herbivores and 21 carnivores. What is the ratio of herbivores to carnivores?

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

Correct Answer: C

Explanation:

84 : 21 = 4 : 1.

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Question (39)

QN0034500

Which statement correctly explains ecosystem balance?

(A) Different organisms interact in ways that regulate populations and resources.
(B) Ecosystems remain balanced without interactions.
(C) Only producers maintain balance.
(D) Only predators maintain balance.

Correct Answer: A

Explanation:

Interactions help maintain ecosystem stability.

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Question (40)

QN0034501

A forest has 600 plants. Grazing animals consume 15% of them during a season. How many plants remain?

(A) 480
(B) 500
(C) 510
(D) 540

Correct Answer: C

Explanation:

15% of 600 = 90; 600 − 90 = 510.

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Question (31)

Why are food webs generally more stable than simple food chains?

Explanation:

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Question (32)

A pond contains 48 frogs and 12 snakes. What is the ratio of frogs to snakes?

Explanation:

Link:

Question (33)

Which event is most likely to improve ecosystem balance?

Explanation:

Link:

Question (34)

A forest population of deer rises from 250 to 300. What percentage increase occurs?

Explanation:

Link:

Question (35)

Which interaction benefits one organism while harming another?

Explanation:

Link:

Question (36)

In a lake, 420 fish are distributed equally among 14 regions. How many fish are present per region on average?

Explanation:

Link:

Question (37)

Which factor helps populations avoid growing without limit?

Explanation:

Link:

Question (38)

A habitat contains 84 herbivores and 21 carnivores. What is the ratio of herbivores to carnivores?

Explanation:

Link:

Question (39)

Which statement correctly explains ecosystem balance?

Explanation:

Link:

Question (40)

A forest has 600 plants. Grazing animals consume 15% of them during a season. How many plants remain?

Explanation:

Link:

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