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Question (41)

QN0036262

41 CFCs were used as

(A) refrigerants
(B) plant nutrients
(C) food preservatives only
(D) decomposers

Correct Answer: A

Explanation:

CFCs were used in refrigerants and fire extinguishers.

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Question (42)

QN0036263

42 Which international organisation succeeded in forging an agreement to freeze CFC production at 1986 levels in 1987?

(A) WHO
(B) UNEP
(C) UNESCO
(D) UNICEF

Correct Answer: B

Explanation:

The United Nations Environment Programme (UNEP) helped establish the agreement in 1987.

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Question (43)

QN0036264

43 A substance that can be broken down by biological processes is called

(A) non-biodegradable
(B) biodegradable
(C) synthetic
(D) inert

Correct Answer: B

Explanation:

Biodegradable substances can be broken down by biological processes.

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Question (44)

QN0036265

44 Which of the following is non-biodegradable?

(A) Vegetable peels
(B) Grass
(C) Plastic
(D) Wood

Correct Answer: C

Explanation:

Plastics are generally not broken down by bacteria or other saprophytes under ordinary environmental conditions.

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Question (45)

QN0036266

45 Why do many plastics persist in the environment for a long time?

(A) They are easily digested by enzymes
(B) They are not broken down by bacteria or other saprophytes under ambient conditions
(C) They are converted into food
(D) They are rapidly decomposed by plants

Correct Answer: B

Explanation:

Many plastics are not biologically broken down under normal environmental conditions.

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Question (46)

QN0036267

46 Which of the following contains only biodegradable items?

(A) Grass, flowers and leather
(B) Grass, wood and plastic
(C) Plastic, glass and metal
(D) Plastic, rubber and glass

Correct Answer: A

Explanation:

Grass, flowers and leather can be broken down by biological processes.

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Question (47)

QN0036268

47 Which of the following represents a food chain?

(A) Grass → goat → human
(B) Grass → wheat → mango
(C) Goat → cow → elephant
(D) Grass → fish → goat

Correct Answer: A

Explanation:

Grass is eaten by the goat, which can then be consumed by humans.

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Question (48)

QN0036269

48 Which practice is environment-friendly?

(A) Carrying cloth bags while shopping
(B) Leaving unnecessary lights switched on
(C) Increasing disposable plastic use
(D) Throwing waste into water bodies

Correct Answer: A

Explanation:

Carrying cloth bags reduces dependence on disposable plastic bags.

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Question (49)

QN0036270

49 If all organisms at one trophic level are removed, what is likely to happen?

(A) The ecosystem can be affected because organisms are interdependent
(B) Nothing will change
(C) Only sunlight will be affected
(D) Decomposers will immediately disappear everywhere

Correct Answer: A

Explanation:

Ecosystem components depend on one another, so removing a trophic level can disturb the ecosystem.

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Question (50)

QN0036271

50 Which statement best summarises the chapter Our Environment?

(A) Ecosystems contain only living organisms
(B) Energy increases at every trophic level
(C) Ecosystem components are interdependent and human activities affect the environment
(D) All waste is biodegradable

Correct Answer: C

Explanation:

The chapter explains ecosystem interdependence, energy flow, biological magnification, ozone depletion and waste management.

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Question (41)

41 CFCs were used as

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Question (42)

42 Which international organisation succeeded in forging an agreement to freeze CFC production at 1986 levels in 1987?

Explanation:

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Question (43)

43 A substance that can be broken down by biological processes is called

Explanation:

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Question (44)

44 Which of the following is non-biodegradable?

Explanation:

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Question (45)

45 Why do many plastics persist in the environment for a long time?

Explanation:

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Question (46)

46 Which of the following contains only biodegradable items?

Explanation:

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Question (47)

47 Which of the following represents a food chain?

Explanation:

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Question (48)

48 Which practice is environment-friendly?

Explanation:

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Question (49)

49 If all organisms at one trophic level are removed, what is likely to happen?

Explanation:

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Question (50)

50 Which statement best summarises the chapter Our Environment?

Explanation:

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