Tag: global environmental change

Questions Related to global environmental change

Which of the following is not a greenhouse gas?

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. $N _2O$

  2. CFC

  3. $O _3$

  4. $SO _2$

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Correct Option: D
Explanation:

The gases which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called greenhouse gases. The various greenhouse gases are carbon dioxide, methane, chlorofluorocarbons and nitrous oxide. Other gases of minor significance are water vapour and ozone. Thus, the correct answer is option D.

Which of the following is a green house gas?

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. CO

  2. CO$ _2$

  3. H$ _2$

  4. N$ _2$

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Correct Option: B
Explanation:

Carbon dioxide is normally a non-polluting gas and is required for the normal process of photosynthesis by green plants. However, higher atmospheric concentrations of carbon dioxide due to the high rate of emission from the vehicle and deforestation leads to heating of earth and global warming.

So, the correct answer is option B.

Increase of temperature due to scattering of energy is by ozone, CO$ _2$ and water vapour, is known as

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. Radioactivity

  2. Ozone effect

  3. Solar reaction

  4. Greenhouse effect

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Correct Option: D
Explanation:

Global warming is the overheating of the earth due to the increased concentration of greenhouse gasses. Greenhouse gasses generally traps the radiations of the earth which leads to increase in the temperature of the earth and global warming. The greenhouse gasses includes water vapor, carbon dioxide, methane, nitrous oxide, and ozone. 

Checking of radiating heat by atmospheric dust, O$ _3$, CO$ _2$ and water vapours is

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. Greenhouse effect

  2. Solar effect

  3. Ozone layer effect

  4. Radioactive effect

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Correct Option: A
Explanation:

The concentration of oxides increases due to the high rate of emission from the vehicle and other human activities like deforestation. The oxides form a layer which traps solar radiation to escape the earth atmosphere which leads to global warming.

So, the correct answer is option A.

The term greenhouse effect was given by

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. Fourier

  2. Tyndall

  3. Arrhenius

  4. Linnaeus

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Correct Option: C
Explanation:

Svante Arrhenius, a Swedish scientist, in 1896 gave the theory related to the effects of the combustion-released carbon dioxide. He depicted the relation between the concentration of the carbon dioxide and the increase in temperature due to it. The greenhouse effect refers to the trapping of the infra-red rays reflected by the earth’s surface by the gases present in the troposphere. It is a natural process and is responsible for maintaining the survivable temperature in earth. However, anthropogenic release of the greenhouse gases has caused the events of global warming. Hence, the correct answer is 'Svante Arrhenius'.

Increase in atmospheric temperature due to $CO _2$ is

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. Pasteur effect

  2. Blackman effect

  3. Emerson effect

  4. Green-house effect

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Correct Option: D
Explanation:
A. Pasteur effect is the inhibition of fermentation or oxidation of glucose when the concentration of oxygen is increased.
B. Blackman effect describes the law of limiting factors according to which if a process is dependent on a number of factors then its rate is limited by the slowest factor.
C. Emerson effect is the increase in rate of photosynthesis when the light intensity is increased beyond 680 nm.
D. Green house effect is the increase in atmospheric temperature due to warming of earth's surface when the sun radiations are trapped in the earth. The radiations are trapped in earth because of green house gases like carbon dioxide.
So, the correct answer is 'Green-house effect'.

Green house effect is increase in temperature of earth due to

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. High concentration of $NO _2$

  2. High concentration of $SO _2$

  3. High concentration of $CO _2$

  4. High concentration of CO

Show answer
Correct Option: C
Explanation:
The warming of earth's surface when sun radiations are absorbed and trapped in earth's atmosphere, is called greenhouse effect. The gases responsible for green house effect are called green house gases which trap the radiations and don't let them reflect back from the earth's surface. The green house gases are Chlorofluorocarbons (CFC's), Carbon dioxide (CO2), Methane (CH4) and Nitrous Oxide (N2O). 
The approximate percentage of different greenhouse gases in the atmosphere is:
CFCs - 14%
CO2 - 60%
‎CH4 - 20%
N2O - 6%
Among all these gases, concentration of CO2 is highest. It is the main greenhouse gas.
So, the correct answer is 'High concentration of CO2'.

Why do scientists think that human-induced global warming will be more harmful to plants and animals than were past, natural climate fluctuations?

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. because temperature will change faster

  2. because the temperature changes will be larger

  3. because species now are less adaptable than species in the past

  4. because ecosystems are now more complicated than they used to be

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Correct Option: A
Explanation:

Global warming is the increase in temperature of earth due to the increased concentration of greenhouse gases in the atmosphere. Temperature change due to global warming is faster than the temperature change due to natural climate fluctuations. This has resulted in melting of ice glaciers which will lead to rising in sea level and also the amount of freshwater will decline. Abnormal increase in temperature due to global warming has resulted in the extinction of many plant and animal species because of habitat loss and extreme climatic conditions.

So, the correct answer is 'because the temperature will change faster'.

Of the gases listed below, which is NOT believed to be responsible for enhancing the earth's greenhouse effect?

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. Chlorofluorocarbons $(CFC _{s})$

  2. Molecular oxygen $(O _{2})$

  3. Nitrous oxide $(N _{2}O)$

  4. Carbon dioxide $(CO _{2})$

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Correct Option: B

Without the atmospheric greenhouse effect, the average surface temperature would be:

biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

  1. Higher than at present

  2. Lower than at present

  3. The same as it is now

  4. Much more variable than it is now

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Correct Option: B