AP BIOLOGY

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ECOLOGY

CHEMICAL CYCLES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Jenny is learning about the importance of the ozone layer. She was upset to know that there is a depletion of the ozone layer and human activities are adding to it. While she decides to spread awareness on the effects of pollution and reasons to curb it, she cannot do anything about the natural process of ozone depletion. What is the natural process that is causing the depletion of the ozone layer?
A
one that ensures ecological balance
B
burning of fossil fuel
C
UV rays reacting with the O2 molecules
D
carbon cycle
E
oxygen cycle
Explanation: 

Detailed explanation-1: -Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules.

Detailed explanation-2: -Damage to the ozone layer is a cause for concern because the harmful ultraviolet (UV) radiation from the sun will reach the earth. This radiation is highly damaging to organisms, for example, is known to cause skin cancer in human beings.

Detailed explanation-3: -Buy air-conditioning and refrigeration equipment that do not use HCFCs as refrigerant. Buy aerosol products that do not use HCFCs or CFCs as propellants. Conduct regular inspection and maintenance of air-conditioning and refrigeration appliances to prevent and minimize refrigerant leakage.

Detailed explanation-4: -The stratospheric ozone depletion process begins with the emission of halogen source gases by human activities and natural processes. Those emitted by human activities are also called ozone-depleting substances (ODSs). Subsequent steps are accumulation, transport, conversion, chemical reaction, and removal.

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