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Question (11)

QN0034472

A pond has 90 fish and 30 larger fish that feed on them. What is the ratio of prey fish to predator fish?

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

Correct Answer: B

Explanation:

90 : 30 = 3 : 1.

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Question (12)

QN0034473

Which interaction helps flowering plants reproduce while providing food to insects?

(A) Competition
(B) Pollination
(C) Predation
(D) Scavenging

Correct Answer: B

Explanation:

Pollination benefits both flowering plants and pollinators.

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Question (13)

QN0034474

If a rabbit population grows from 80 to 120, what is the percentage increase?

(A) 25%
(B) 40%
(C) 50%
(D) 60%

Correct Answer: C

Explanation:

Increase = 40; (40/80) × 100 = 50%.

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Question (14)

QN0034475

Which factor is most likely to disturb ecosystem balance?

(A) Sudden removal of a key species
(B) Regular nutrient recycling
(C) Natural pollination
(D) Seed dispersal

Correct Answer: A

Explanation:

Removal of a key species can disrupt ecosystem balance.

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Question (15)

QN0034476

The exact definition of a predator is an organism that ________.

(A) makes its own food
(B) breaks down dead matter
(C) hunts and feeds on other organisms
(D) lives on roots only

Correct Answer: C

Explanation:

Predators hunt and consume other organisms.

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Question (16)

QN0034477

A forest contains 240 trees. If disease destroys 15% of them, how many trees are lost?

(A) 24
(B) 30
(C) 36
(D) 42

Correct Answer: C

Explanation:

15% of 240 = 36.

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Question (17)

QN0034478

Which interaction occurs when two organisms require the same resource?

(A) Mutualism
(B) Competition
(C) Predation
(D) Decomposition

Correct Answer: B

Explanation:

Competition occurs over limited resources.

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Question (18)

QN0034479

In a grassland, 300 rabbits support 60 foxes. What is the ratio of rabbits to foxes?

(A) 3 : 1
(B) 4 : 1
(C) 5 : 1
(D) 6 : 1

Correct Answer: C

Explanation:

300 : 60 = 5 : 1.

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Question (19)

QN0034480

Why do ecosystems require biodiversity?

(A) It helps ecosystems remain stable.
(B) It reduces nutrient cycling.
(C) It eliminates interactions.
(D) It stops reproduction.

Correct Answer: A

Explanation:

Biodiversity improves ecosystem stability.

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Question (20)

QN0034481

A lake contains 500 fish. If pollution causes a decline of 20%, how many fish remain?

(A) 350
(B) 400
(C) 450
(D) 480

Correct Answer: B

Explanation:

20% of 500 = 100; 500 − 100 = 400.

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Question (11)

A pond has 90 fish and 30 larger fish that feed on them. What is the ratio of prey fish to predator fish?

Explanation:

Link:

Question (12)

Which interaction helps flowering plants reproduce while providing food to insects?

Explanation:

Link:

Question (13)

If a rabbit population grows from 80 to 120, what is the percentage increase?

Explanation:

Link:

Question (14)

Which factor is most likely to disturb ecosystem balance?

Explanation:

Link:

Question (15)

The exact definition of a predator is an organism that ________.

Explanation:

Link:

Question (16)

A forest contains 240 trees. If disease destroys 15% of them, how many trees are lost?

Explanation:

Link:

Question (17)

Which interaction occurs when two organisms require the same resource?

Explanation:

Link:

Question (18)

In a grassland, 300 rabbits support 60 foxes. What is the ratio of rabbits to foxes?

Explanation:

Link:

Question (19)

Why do ecosystems require biodiversity?

Explanation:

Link:

Question (20)

A lake contains 500 fish. If pollution causes a decline of 20%, how many fish remain?

Explanation:

Link:

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