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Question (1)

QN0034382

Organisms that break down dead plants, animals, and waste materials are called ________.

(A) producers
(B) consumers
(C) decomposers
(D) predators

Correct Answer: C

Explanation:

Decomposers break down dead organic matter.

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Question (2)

QN0034383

The process of breaking down dead organic matter into simpler substances is called ________.

(A) pollination
(B) decomposition
(C) germination
(D) respiration

Correct Answer: B

Explanation:

Decomposition converts dead matter into simpler substances.

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Question (3)

QN0034384

Which of the following is a decomposer?

(A) Mushroom
(B) Deer
(C) Tiger
(D) Sparrow

Correct Answer: A

Explanation:

Mushrooms are decomposers.

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Question (4)

QN0034385

What is the primary role of decomposers in nature?

(A) Produce food
(B) Recycle nutrients
(C) Pollinate flowers
(D) Store sunlight

Correct Answer: B

Explanation:

Decomposers recycle nutrients back into the ecosystem.

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Question (5)

QN0034386

Which microorganisms are mainly responsible for decomposition?

(A) Bacteria and fungi
(B) Birds and insects
(C) Fish and frogs
(D) Snakes and lizards

Correct Answer: A

Explanation:

Bacteria and fungi are major decomposers.

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Question (6)

QN0034387

If 120 kg of fallen leaves decompose into 30 kg of humus, how much mass is reduced during decomposition?

(A) 60 kg
(B) 70 kg
(C) 80 kg
(D) 90 kg

Correct Answer: D

Explanation:

120 − 30 = 90 kg.

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Question (7)

QN0034388

Which substance formed by decomposition improves soil fertility?

(A) Plastic
(B) Humus
(C) Glass
(D) Sand

Correct Answer: B

Explanation:

Humus enriches the soil.

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Question (8)

QN0034389

Waste materials that can be broken down naturally by microorganisms are called ________.

(A) non-biodegradable wastes
(B) synthetic wastes
(C) biodegradable wastes
(D) industrial wastes

Correct Answer: C

Explanation:

Biodegradable wastes can be decomposed naturally.

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Question (9)

QN0034390

Which of the following is biodegradable?

(A) Plastic bottle
(B) Glass jar
(C) Banana peel
(D) Aluminum can

Correct Answer: C

Explanation:

Banana peel decomposes naturally.

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Question (10)

QN0034391

If 48 fruit peels are added to a compost pit and 18 decompose completely in one week, how many remain undecomposed?

(A) 20
(B) 24
(C) 30
(D) 36

Correct Answer: C

Explanation:

48 − 18 = 30.

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Question (1)

Organisms that break down dead plants, animals, and waste materials are called ________.

Explanation:

Link:

Question (2)

The process of breaking down dead organic matter into simpler substances is called ________.

Explanation:

Link:

Question (3)

Which of the following is a decomposer?

Explanation:

Link:

Question (4)

What is the primary role of decomposers in nature?

Explanation:

Link:

Question (5)

Which microorganisms are mainly responsible for decomposition?

Explanation:

Link:

Question (6)

If 120 kg of fallen leaves decompose into 30 kg of humus, how much mass is reduced during decomposition?

Explanation:

Link:

Question (7)

Which substance formed by decomposition improves soil fertility?

Explanation:

Link:

Question (8)

Waste materials that can be broken down naturally by microorganisms are called ________.

Explanation:

Link:

Question (9)

Which of the following is biodegradable?

Explanation:

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Question (10)

If 48 fruit peels are added to a compost pit and 18 decompose completely in one week, how many remain undecomposed?

Explanation:

Link:

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