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Question (21)

QN0036242

21 Approximately what percentage of sunlight energy falling on the leaves is captured by green plants in a terrestrial ecosystem?

(A) 1%
(B) 10%
(C) 25%
(D) 50%

Correct Answer: A

Explanation:

Green plants capture about 1% of the sunlight energy falling on their leaves.

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Question (22)

QN0036243

22 Approximately what percentage of food eaten by a primary consumer becomes its own body and is available to the next trophic level?

(A) 1%
(B) 5%
(C) 10%
(D) 50%

Correct Answer: C

Explanation:

An average of 10% of the food eaten becomes body matter available to the next level.

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Question (23)

QN0036244

23 Why do food chains generally consist of only three or four steps?

(A) Producers cannot reproduce
(B) Very little usable energy remains after several trophic levels
(C) Consumers cannot eat producers
(D) Decomposers stop working

Correct Answer: B

Explanation:

A large amount of energy is lost at each trophic level.

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Question (24)

QN0036245

24 If a producer contains 1000 units of usable organic matter, approximately how much may reach the next trophic level?

(A) 100 units
(B) 500 units
(C) 900 units
(D) 10 units

Correct Answer: A

Explanation:

About 10% reaches the next trophic level, so 10% of 1000 is 100 units.

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Question (25)

QN0036246

25 If 100 units of organic matter are available at one trophic level, approximately how much reaches the next level?

(A) 1 unit
(B) 10 units
(C) 50 units
(D) 90 units

Correct Answer: B

Explanation:

According to the 10% transfer rule, about 10 units reach the next level.

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Question (26)

QN0036247

26 Why does energy decrease as we move up trophic levels?

(A) Energy is created at each level
(B) Much energy is lost to the environment
(C) Consumers produce extra sunlight
(D) Producers absorb all energy again

Correct Answer: B

Explanation:

Energy is lost to the environment at each trophic level.

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Question (27)

QN0036248

27 Which statement correctly describes energy flow in an ecosystem?

(A) It is circular
(B) It is unidirectional
(C) It moves only from consumers to producers
(D) It moves randomly

Correct Answer: B

Explanation:

Energy flows in one direction from sunlight to producers and then through successive trophic levels.

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Question (28)

QN0036249

28 Why is energy that passes to herbivores not returned to autotrophs?

(A) Energy is progressively lost and becomes unavailable to previous trophic levels
(B) Herbivores destroy sunlight
(C) Producers cannot absorb energy
(D) Decomposers remove all plants

Correct Answer: A

Explanation:

Energy is progressively lost as it moves through trophic levels.

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Question (29)

QN0036250

29 What is a food web?

(A) A single organism
(B) A series of branching food chains
(C) A group of decomposers only
(D) A group of abiotic components

Correct Answer: B

Explanation:

Several interconnected food chains form a food web.

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Question (30)

QN0036251

30 Why is a food web more complex than a food chain?

(A) Each organism may be eaten by more than one kind of organism
(B) It contains no producers
(C) It contains only one trophic level
(D) It contains only decomposers

Correct Answer: A

Explanation:

Organisms may have several feeding relationships, creating branching pathways.

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Question (21)

21 Approximately what percentage of sunlight energy falling on the leaves is captured by green plants in a terrestrial ecosystem?

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Question (22)

22 Approximately what percentage of food eaten by a primary consumer becomes its own body and is available to the next trophic level?

Explanation:

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Question (23)

23 Why do food chains generally consist of only three or four steps?

Explanation:

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Question (24)

24 If a producer contains 1000 units of usable organic matter, approximately how much may reach the next trophic level?

Explanation:

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Question (25)

25 If 100 units of organic matter are available at one trophic level, approximately how much reaches the next level?

Explanation:

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Question (26)

26 Why does energy decrease as we move up trophic levels?

Explanation:

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Question (27)

27 Which statement correctly describes energy flow in an ecosystem?

Explanation:

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Question (28)

28 Why is energy that passes to herbivores not returned to autotrophs?

Explanation:

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Question (29)

29 What is a food web?

Explanation:

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Question (30)

30 Why is a food web more complex than a food chain?

Explanation:

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