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Question (31)

QN0034452

Why is it important to study chains of changes in ecosystems?

(A) To understand how different factors influence one another
(B) To count rocks only
(C) To measure clouds only
(D) To classify colours only

Correct Answer: A

Explanation:

Ecosystem components are interconnected.

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Question (32)

QN0034453

A population of fish increases from 160 to 200 due to improved water quality. What is the increase?

(A) 20
(B) 30
(C) 40
(D) 50

Correct Answer: C

Explanation:

200 − 160 = 40.

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Question (33)

QN0034454

Which change is most likely to affect the entire food web?

(A) Loss of producers
(B) Colour change in one flower
(C) Shape of a leaf
(D) Size of a pebble

Correct Answer: A

Explanation:

Producers form the base of food webs.

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Question (34)

QN0034455

A pond contains 300 litres of water. After evaporation, 18 litres are lost. How much water remains?

(A) 262 L
(B) 272 L
(C) 282 L
(D) 292 L

Correct Answer: C

Explanation:

300 − 18 = 282 L.

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Question (35)

QN0034456

Which of the following best shows that ecosystems are dynamic?

(A) Conditions and populations change over time.
(B) Nothing changes in nature.
(C) Only rocks change.
(D) Only water changes.

Correct Answer: A

Explanation:

Ecosystems continuously change.

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Question (36)

QN0034457

A herd of 84 deer loses 21 deer during a drought. What fraction of the herd is lost?

(A) 1/8
(B) 1/5
(C) 1/4
(D) 1/3

Correct Answer: C

Explanation:

21/84 = 1/4.

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Question (37)

QN0034458

Which event is most likely to occur if water availability increases significantly?

(A) Growth of many plants may increase.
(B) All organisms disappear.
(C) Soil vanishes.
(D) Rocks multiply.

Correct Answer: A

Explanation:

Water supports plant growth.

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Question (38)

QN0034459

If 45 trees produce 20 fruits each, how many fruits are produced altogether?

(A) 700
(B) 800
(C) 900
(D) 1000

Correct Answer: C

Explanation:

45 × 20 = 900.

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Question (39)

QN0034460

Which statement about chains of changes is correct?

(A) One change can influence several other changes.
(B) Changes always remain isolated.
(C) Only animals are involved.
(D) Only plants are affected.

Correct Answer: A

Explanation:

Changes are often interconnected.

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Question (40)

QN0034461

A wetland supports 500 birds. Pollution causes a decline of 10%. How many birds remain?

(A) 400
(B) 425
(C) 450
(D) 475

Correct Answer: C

Explanation:

10% of 500 = 50; 500 − 50 = 450.

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Question (31)

Why is it important to study chains of changes in ecosystems?

Explanation:

Link:

Question (32)

A population of fish increases from 160 to 200 due to improved water quality. What is the increase?

Explanation:

Link:

Question (33)

Which change is most likely to affect the entire food web?

Explanation:

Link:

Question (34)

A pond contains 300 litres of water. After evaporation, 18 litres are lost. How much water remains?

Explanation:

Link:

Question (35)

Which of the following best shows that ecosystems are dynamic?

Explanation:

Link:

Question (36)

A herd of 84 deer loses 21 deer during a drought. What fraction of the herd is lost?

Explanation:

Link:

Question (37)

Which event is most likely to occur if water availability increases significantly?

Explanation:

Link:

Question (38)

If 45 trees produce 20 fruits each, how many fruits are produced altogether?

Explanation:

Link:

Question (39)

Which statement about chains of changes is correct?

Explanation:

Link:

Question (40)

A wetland supports 500 birds. Pollution causes a decline of 10%. How many birds remain?

Explanation:

Link:

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