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Question (1)

QN0034422

A series of events in which one change causes another change is called a ________.

(A) food chain
(B) chain of changes
(C) habitat
(D) adaptation

Correct Answer: B

Explanation:

A chain of changes occurs when one change leads to another.

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Question (2)

QN0034423

Which statement best describes a chain of changes in nature?

(A) Changes occur independently.
(B) One event can trigger several other events.
(C) Only living organisms are involved.
(D) Changes always happen instantly.

Correct Answer: B

Explanation:

One change can lead to many related changes.

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Question (3)

QN0034424

If heavy rainfall increases the water level in a pond by 12 cm and then evaporation reduces it by 5 cm, what is the final increase in water level?

(A) 5 cm
(B) 7 cm
(C) 12 cm
(D) 17 cm

Correct Answer: B

Explanation:

12 − 5 = 7 cm.

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Question (4)

QN0034425

Which of the following is most likely to start a chain of changes in an ecosystem?

(A) Change in rainfall
(B) Shape of a rock
(C) Colour of soil
(D) Position of stars

Correct Answer: A

Explanation:

Rainfall affects many living and non-living components.

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Question (5)

QN0034426

A decrease in rainfall causes less plant growth. This is an example of ________.

(A) decomposition
(B) a chain of changes
(C) migration only
(D) camouflage

Correct Answer: B

Explanation:

One environmental change causes another.

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Question (6)

QN0034427

A lake contains 400 fish. Due to reduced oxygen, 80 fish die. What percentage of fish survive?

(A) 20%
(B) 40%
(C) 60%
(D) 80%

Correct Answer: D

Explanation:

Surviving fish = 320; (320/400) × 100 = 80%.

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Question (7)

QN0034428

Which factor is most likely to affect many organisms at the same time?

(A) Seasonal change
(B) Colour of one leaf
(C) Shape of one seed
(D) Size of one insect

Correct Answer: A

Explanation:

Seasonal changes influence entire ecosystems.

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Question (8)

QN0034429

The exact meaning of “cause” in a chain of changes is ________.

(A) the result of a change
(B) the reason a change happens
(C) a living organism
(D) a non-living object

Correct Answer: B

Explanation:

Cause is the reason behind a change.

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Question (9)

QN0034430

If 60 plants grow in an area and later only 45 remain because of drought, how many plants were lost?

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

Correct Answer: B

Explanation:

60 − 45 = 15.

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Question (10)

QN0034431

Which of the following best represents a chain reaction in nature?

(A) Rainfall → More plants → More herbivores
(B) Stone → Stone → Stone
(C) Leaf → Leaf → Leaf
(D) Sand → Sand → Sand

Correct Answer: A

Explanation:

Increased rainfall can support more plants and herbivores.

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Question (1)

A series of events in which one change causes another change is called a ________.

Explanation:

Link:

Question (2)

Which statement best describes a chain of changes in nature?

Explanation:

Link:

Question (3)

If heavy rainfall increases the water level in a pond by 12 cm and then evaporation reduces it by 5 cm, what is the final increase in water level?

Explanation:

Link:

Question (4)

Which of the following is most likely to start a chain of changes in an ecosystem?

Explanation:

Link:

Question (5)

A decrease in rainfall causes less plant growth. This is an example of ________.

Explanation:

Link:

Question (6)

A lake contains 400 fish. Due to reduced oxygen, 80 fish die. What percentage of fish survive?

Explanation:

Link:

Question (7)

Which factor is most likely to affect many organisms at the same time?

Explanation:

Link:

Question (8)

The exact meaning of “cause” in a chain of changes is ________.

Explanation:

Link:

Question (9)

If 60 plants grow in an area and later only 45 remain because of drought, how many plants were lost?

Explanation:

Link:

Question (10)

Which of the following best represents a chain reaction in nature?

Explanation:

Link:

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