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Question (21)

QN0034442

Which observation best illustrates interdependence in nature?

(A) Plants and animals influence each other's populations.
(B) Organisms live without affecting one another.
(C) Rocks produce food.
(D) Water does not affect life.

Correct Answer: A

Explanation:

Organisms depend on each other for survival.

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Question (22)

QN0034443

If a tree produces 150 fruits and birds eat 40 of them, how many fruits remain on the tree?

(A) 90
(B) 100
(C) 110
(D) 120

Correct Answer: C

Explanation:

150 − 40 = 110.

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Question (23)

QN0034444

A decrease in pollinating insects is most likely to affect ________.

(A) flowering plant reproduction
(B) rock formation
(C) cloud formation only
(D) mountain height

Correct Answer: A

Explanation:

Pollinators help flowering plants reproduce.

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Question (24)

QN0034445

A pond has 240 frogs. Due to habitat loss, the number decreases to 180. What fraction of the original population remains?

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

Correct Answer: C

Explanation:

180/240 = 3/4.

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Question (25)

QN0034446

Which factor can begin a chain of ecological changes?

(A) Sudden drought
(B) Colour of a pebble
(C) Shape of a cloud
(D) Size of a grain of sand

Correct Answer: A

Explanation:

Drought affects water, plants, and animals.

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Question (26)

QN0034447

If an insect population drops by half from 200 insects, what is the new population?

(A) 50
(B) 75
(C) 100
(D) 150

Correct Answer: C

Explanation:

Half of 200 is 100.

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Question (27)

QN0034448

Which statement correctly explains cause and effect?

(A) Effect always occurs before cause.
(B) Cause produces an effect.
(C) Cause and effect are unrelated.
(D) Effects create causes only.

Correct Answer: B

Explanation:

Causes lead to effects.

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Question (28)

QN0034449

Rainfall in a region increased from 40 cm to 55 cm. What is the increase?

(A) 10 cm
(B) 12 cm
(C) 15 cm
(D) 20 cm

Correct Answer: C

Explanation:

55 − 40 = 15 cm.

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Question (29)

QN0034450

Which example best demonstrates a chain of environmental changes?

(A) Forest fire → Loss of plants → Reduced animal populations
(B) Rock → Rock → Rock
(C) Water → Water → Water
(D) Soil → Soil → Soil

Correct Answer: A

Explanation:

One event causes subsequent ecological effects.

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Question (30)

QN0034451

If 96 seedlings are planted and 72 survive after a dry season, what percentage survive?

(A) 60%
(B) 65%
(C) 75%
(D) 80%

Correct Answer: C

Explanation:

(72/96) × 100 = 75%.

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Question (21)

Which observation best illustrates interdependence in nature?

Explanation:

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Question (22)

If a tree produces 150 fruits and birds eat 40 of them, how many fruits remain on the tree?

Explanation:

Link:

Question (23)

A decrease in pollinating insects is most likely to affect ________.

Explanation:

Link:

Question (24)

A pond has 240 frogs. Due to habitat loss, the number decreases to 180. What fraction of the original population remains?

Explanation:

Link:

Question (25)

Which factor can begin a chain of ecological changes?

Explanation:

Link:

Question (26)

If an insect population drops by half from 200 insects, what is the new population?

Explanation:

Link:

Question (27)

Which statement correctly explains cause and effect?

Explanation:

Link:

Question (28)

Rainfall in a region increased from 40 cm to 55 cm. What is the increase?

Explanation:

Link:

Question (29)

Which example best demonstrates a chain of environmental changes?

Explanation:

Link:

Question (30)

If 96 seedlings are planted and 72 survive after a dry season, what percentage survive?

Explanation:

Link:

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