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Question (11)

QN0034432

A population of insects doubles from 50 to 100 due to abundant food. By how many insects did the population increase?

(A) 25
(B) 50
(C) 75
(D) 100

Correct Answer: B

Explanation:

100 − 50 = 50.

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Question (12)

QN0034433

Why can one environmental change affect many organisms?

(A) Organisms are interconnected.
(B) Organisms never interact.
(C) Only plants are affected.
(D) Changes affect only water.

Correct Answer: A

Explanation:

Organisms depend on one another and their surroundings.

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Question (13)

QN0034434

If a pond loses 18 litres of water each day for 5 days, how much water is lost altogether?

(A) 72 L
(B) 80 L
(C) 90 L
(D) 100 L

Correct Answer: C

Explanation:

18 × 5 = 90 L.

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Question (14)

QN0034435

Which event is most likely to occur after an increase in plant growth?

(A) Increase in herbivores
(B) Decrease in sunlight
(C) Increase in rocks
(D) Decrease in soil

Correct Answer: A

Explanation:

More plants provide more food for herbivores.

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Question (15)

QN0034436

The term “effect” refers to ________.

(A) the cause of a change
(B) the result of a change
(C) a type of habitat
(D) a food source

Correct Answer: B

Explanation:

Effect is the outcome of a change.

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Question (16)

QN0034437

A farmer observes 75 insects on crops. After pesticide spraying, only 30 remain. How many insects were removed?

(A) 35
(B) 40
(C) 45
(D) 50

Correct Answer: C

Explanation:

75 − 30 = 45.

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Question (17)

QN0034438

Which sequence shows a logical chain of changes?

(A) Less rain → Less grass → Fewer grazing animals
(B) Less rain → More rivers → More grass
(C) Less rain → More lakes → More fish
(D) Less rain → More crops immediately

Correct Answer: A

Explanation:

Reduced rainfall decreases plant growth and food availability.

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Question (18)

QN0034439

A stream's water level falls from 95 cm to 68 cm. By how many centimetres did it decrease?

(A) 17 cm
(B) 22 cm
(C) 27 cm
(D) 32 cm

Correct Answer: C

Explanation:

95 − 68 = 27 cm.

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Question (19)

QN0034440

Which natural event can trigger changes in both living and non-living components of an ecosystem?

(A) Flood
(B) Feather growth
(C) Nest building only
(D) Seed colour change

Correct Answer: A

Explanation:

Floods affect water, soil, plants, and animals.

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Question (20)

QN0034441

A grassland supports 120 rabbits. A shortage of food reduces the population by 25%. How many rabbits remain?

(A) 60
(B) 75
(C) 90
(D) 100

Correct Answer: C

Explanation:

25% of 120 = 30; 120 − 30 = 90.

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Question (11)

A population of insects doubles from 50 to 100 due to abundant food. By how many insects did the population increase?

Explanation:

Link:

Question (12)

Why can one environmental change affect many organisms?

Explanation:

Link:

Question (13)

If a pond loses 18 litres of water each day for 5 days, how much water is lost altogether?

Explanation:

Link:

Question (14)

Which event is most likely to occur after an increase in plant growth?

Explanation:

Link:

Question (15)

The term “effect” refers to ________.

Explanation:

Link:

Question (16)

A farmer observes 75 insects on crops. After pesticide spraying, only 30 remain. How many insects were removed?

Explanation:

Link:

Question (17)

Which sequence shows a logical chain of changes?

Explanation:

Link:

Question (18)

A stream's water level falls from 95 cm to 68 cm. By how many centimetres did it decrease?

Explanation:

Link:

Question (19)

Which natural event can trigger changes in both living and non-living components of an ecosystem?

Explanation:

Link:

Question (20)

A grassland supports 120 rabbits. A shortage of food reduces the population by 25%. How many rabbits remain?

Explanation:

Link:

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