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Question (11)

QN0010417

Even when river water looks clean, it may still be unsafe because ________.

(A) Harmful substances can be hidden in it
(B) Fish are swimming in it
(C) Rivers are always dangerous
(D) Water is colourless

Correct Answer: A

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Question (12)

QN0010418

Which of the following may remain hidden in apparently clean water?

(A) Chemicals and dirty soapy water
(B) Rocks and mountains
(C) Clouds and fog
(D) Sand dunes

Correct Answer: A

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Question (13)

QN0010419

A river receives fertiliser-rich runoff from nearby fields. What is likely to happen first?

(A) Plants in water grow rapidly
(B) River freezes
(C) Water disappears
(D) Fish become larger instantly

Correct Answer: A

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Question (14)

QN0010420

The lesson compares excessive plant growth on water to a ________.

(A) Blue blanket
(B) Green blanket
(C) White blanket
(D) Brown blanket

Correct Answer: B

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Question (15)

QN0010421

When a river surface becomes covered by a green blanket, fish find it difficult to ________.

(A) Swim
(B) Breathe
(C) Reproduce
(D) Grow scales

Correct Answer: B

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Question (16)

QN0010422

Excessive growth of aquatic plants can make river water unsafe for ________.

(A) Transportation
(B) Drinking
(C) Fishing only
(D) Swimming competitions only

Correct Answer: B

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Question (17)

QN0010423

Which river image would be considered healthier?

(A) River covered completely by a green blanket
(B) River with clean, open water
(C) River full of waste
(D) River covered with plastic bags

Correct Answer: B

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Question (18)

QN0010424

If fertilisers enter a river repeatedly, what is the most likely long-term effect?

(A) More oxygen for fish
(B) Choking of aquatic life
(C) Reduction in plant growth
(D) Cleaner drinking water

Correct Answer: B

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Question (19)

QN0010425

A pond receives fertiliser runoff from five nearby farms. Which sign would best indicate pollution from fertilisers?

(A) Rapid spread of water plants
(B) Formation of hills nearby
(C) Increase in rainfall
(D) Appearance of bridges

Correct Answer: A

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Question (20)

QN0010426

Which sequence best describes the effect of fertilisers entering river water?

(A) Fertilisers → Fast plant growth → Green blanket → Fish struggle to breathe
(B) Fertilisers → Less plants → More oxygen → Cleaner water
(C) Fertilisers → River dries up immediately
(D) Fertilisers → Mountains form near rivers

Correct Answer: A

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Question (11)

Even when river water looks clean, it may still be unsafe because ________.

Explanation:

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Question (12)

Which of the following may remain hidden in apparently clean water?

Explanation:

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Question (13)

A river receives fertiliser-rich runoff from nearby fields. What is likely to happen first?

Explanation:

Link:

Question (14)

The lesson compares excessive plant growth on water to a ________.

Explanation:

Link:

Question (15)

When a river surface becomes covered by a green blanket, fish find it difficult to ________.

Explanation:

Link:

Question (16)

Excessive growth of aquatic plants can make river water unsafe for ________.

Explanation:

Link:

Question (17)

Which river image would be considered healthier?

Explanation:

Link:

Question (18)

If fertilisers enter a river repeatedly, what is the most likely long-term effect?

Explanation:

Link:

Question (19)

A pond receives fertiliser runoff from five nearby farms. Which sign would best indicate pollution from fertilisers?

Explanation:

Link:

Question (20)

Which sequence best describes the effect of fertilisers entering river water?

Explanation:

Link:

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