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Question (11)

QN0034392

Which of the following is non-biodegradable?

(A) Dry leaves
(B) Cotton cloth
(C) Plastic bag
(D) Vegetable waste

Correct Answer: C

Explanation:

Plastic bags do not decompose easily.

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Question (12)

QN0034393

Why are decomposers important in ecosystems?

(A) They make clouds.
(B) They recycle nutrients back into the environment.
(C) They produce rainfall.
(D) They consume sunlight.

Correct Answer: B

Explanation:

Nutrients are returned to the environment through decomposition.

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Question (13)

QN0034394

A compost pit contains 90 kg of biodegradable waste. If 60 kg decomposes, what fraction remains?

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

Correct Answer: A

Explanation:

Remaining = 30 kg; 30/90 = 1/3.

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Question (14)

QN0034395

Which waste is most suitable for composting?

(A) Plastic wrappers
(B) Vegetable peels
(C) Glass pieces
(D) Metal scraps

Correct Answer: B

Explanation:

Vegetable peels are biodegradable.

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Question (15)

QN0034396

The exact term for nutrient-rich material formed from decomposed organic matter is ________.

(A) manure
(B) humus
(C) residue
(D) sediment

Correct Answer: B

Explanation:

Humus is formed after decomposition.

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Question (16)

QN0034397

If 36 kg of kitchen waste produces 12 kg of compost, what is the ratio of waste to compost?

(A) 2 : 1
(B) 3 : 1
(C) 4 : 1
(D) 6 : 1

Correct Answer: B

Explanation:

36 : 12 = 3 : 1.

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Question (17)

QN0034398

Which condition generally speeds up decomposition?

(A) Dryness
(B) Lack of microorganisms
(C) Warm and moist conditions
(D) Absence of air

Correct Answer: C

Explanation:

Warm and moist conditions support decomposers.

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Question (18)

QN0034399

A school collects 150 kg of biodegradable waste. If 40% decomposes in a month, how many kilograms decompose?

(A) 40 kg
(B) 50 kg
(C) 60 kg
(D) 70 kg

Correct Answer: C

Explanation:

40% of 150 = 60 kg.

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Question (19)

QN0034400

What happens to nutrients locked in dead organisms after decomposition?

(A) They disappear permanently.
(B) They return to the environment.
(C) They become plastic.
(D) They move into rocks only.

Correct Answer: B

Explanation:

Nutrients are recycled back into the ecosystem.

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Question (20)

QN0034401

Which organism is most likely to help decompose fallen leaves?

(A) Fungus
(B) Eagle
(C) Deer
(D) Frog

Correct Answer: A

Explanation:

Fungi decompose dead plant matter.

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Question (11)

Which of the following is non-biodegradable?

Explanation:

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Question (12)

Why are decomposers important in ecosystems?

Explanation:

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Question (13)

A compost pit contains 90 kg of biodegradable waste. If 60 kg decomposes, what fraction remains?

Explanation:

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Question (14)

Which waste is most suitable for composting?

Explanation:

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Question (15)

The exact term for nutrient-rich material formed from decomposed organic matter is ________.

Explanation:

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Question (16)

If 36 kg of kitchen waste produces 12 kg of compost, what is the ratio of waste to compost?

Explanation:

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Question (17)

Which condition generally speeds up decomposition?

Explanation:

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Question (18)

A school collects 150 kg of biodegradable waste. If 40% decomposes in a month, how many kilograms decompose?

Explanation:

Link:

Question (19)

What happens to nutrients locked in dead organisms after decomposition?

Explanation:

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Question (20)

Which organism is most likely to help decompose fallen leaves?

Explanation:

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