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Question (31)

QN0036252

31 Pesticides can enter a food chain when they are

(A) absorbed by plants from soil or water
(B) converted into sunlight
(C) destroyed by producers
(D) removed by consumers

Correct Answer: A

Explanation:

Pesticides can enter soil or water and then be taken up by plants and aquatic organisms.

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Question (32)

QN0036253

32 Why can harmful chemicals become concentrated at higher trophic levels?

(A) They are rapidly destroyed
(B) They are non-degradable and accumulate progressively
(C) Producers remove them completely
(D) They turn into oxygen

Correct Answer: B

Explanation:

Non-degradable chemicals accumulate progressively at different trophic levels.

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Question (33)

QN0036254

33 The progressive accumulation of harmful chemicals at successive trophic levels is called

(A) decomposition
(B) biological magnification
(C) photosynthesis
(D) respiration

Correct Answer: B

Explanation:

This process is known as biological magnification.

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Question (34)

QN0036255

34 Which organisms can have the maximum concentration of such chemicals in a food chain?

(A) Producers
(B) Primary consumers
(C) Organisms at the top level
(D) Decomposers only

Correct Answer: C

Explanation:

Organisms at the top trophic level can have the maximum concentration.

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Question (35)

QN0036256

35 Ozone is represented by the formula

(A) O
(B) O₂
(C) O₃
(D) CO₂

Correct Answer: C

Explanation:

Ozone is a molecule formed by three atoms of oxygen.

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Question (36)

QN0036257

36 What important function does ozone perform at higher levels of the atmosphere?

(A) Produces food
(B) Shields Earth from ultraviolet radiation
(C) Produces soil minerals
(D) Increases pesticide concentration

Correct Answer: B

Explanation:

Atmospheric ozone protects the Earth's surface from harmful UV radiation.

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Question (37)

QN0036258

37 Ultraviolet radiation from the Sun is harmful because it can

(A) damage organisms
(B) increase food production only
(C) create soil
(D) eliminate all bacteria

Correct Answer: A

Explanation:

UV radiation can damage organisms and is known to cause skin cancer.

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Question (38)

QN0036259

38 How is ozone formed in the upper atmosphere?

(A) UV radiation acts on oxygen molecules
(B) Carbon dioxide combines with nitrogen
(C) Water directly changes into ozone
(D) Soil produces ozone

Correct Answer: A

Explanation:

UV radiation splits oxygen molecules, and oxygen atoms combine with O₂ to form O₃.

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Question (39)

QN0036260

39 The sharp decrease in atmospheric ozone began around the

(A) 1950s
(B) 1960s
(C) 1980s
(D) 2000s

Correct Answer: C

Explanation:

The amount of ozone began to drop sharply in the 1980s.

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Question (40)

QN0036261

40 Which synthetic chemicals are linked with depletion of the ozone layer?

(A) CFCs
(B) Proteins
(C) Carbohydrates
(D) Minerals

Correct Answer: A

Explanation:

Chlorofluorocarbons or CFCs are linked with ozone depletion.

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Question (31)

31 Pesticides can enter a food chain when they are

Explanation:

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Question (32)

32 Why can harmful chemicals become concentrated at higher trophic levels?

Explanation:

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Question (33)

33 The progressive accumulation of harmful chemicals at successive trophic levels is called

Explanation:

Link:

Question (34)

34 Which organisms can have the maximum concentration of such chemicals in a food chain?

Explanation:

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Question (35)

35 Ozone is represented by the formula

Explanation:

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Question (36)

36 What important function does ozone perform at higher levels of the atmosphere?

Explanation:

Link:

Question (37)

37 Ultraviolet radiation from the Sun is harmful because it can

Explanation:

Link:

Question (38)

38 How is ozone formed in the upper atmosphere?

Explanation:

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Question (39)

39 The sharp decrease in atmospheric ozone began around the

Explanation:

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Question (40)

40 Which synthetic chemicals are linked with depletion of the ozone layer?

Explanation:

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