[anoos04]

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اللي هوه سؤال 117 ‘إلى سؤال 120
وهذي هي

Topic: 7.13
Skill: Factual Recall

117) It has been argued that cutting old-growth forests and replacing them with plantations of young trees would help to alleviate the threat of global greenhouse warming. What important fact does this argument ignore?
A) Forests play too minor a role in global CO2 dynamics, which are affected far more by marine algae.
B) Young trees fix carbon at a lower rate per unit mass than old trees.
C) Most of the biomass of the cut trees would be added to the atmosphere as CO2 within a few years.
D) Most of the young trees would die within a few years.
E) Young trees emit ozone-destroying gases at a higher rate than old trees and would thus worsen the ozone-hole problem while alleviating global warming.
Answer: C
Topic: 7.13
Skill: Conceptual Understanding

118) Ozone
A) formation is promoted by CFCs.
B) is broken down by carbon dioxide.
C) is a source of oxygen for cellular respiration.
D) levels in the atmosphere have been steadily increasing in the past century.
E) protects Earth from UV radiation.
Answer: E
Topic: 7.14
Skill: Factual Recall

119) Ozone consists of ________ oxygen atom(s).
A) zero
B) one
C) two
D) three
E) four
Answer: D
Topic: 7.14
Skill: Factual Recall

120) Which of the following has been a major source of ozone destruction over the past 50 years?
A) chlorofluorocarbons
B) ethylene glycol
C) carbon dioxide
D) chemiosmosis
E) cellular respiration
Answer: A
Topic: 7.14
Skill: Factual Recall

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