Tag: global environmental change

Quizzes (7) Questions (240)

Questions Related to global environmental change

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

Which of the following is not a greenhouse gas?

  1. $N _2O$

  2. CFC
  3. $O _3$
  4. $SO _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the following is a green house gas?

  1. CO
  2. CO$ _2$
  3. H$ _2$
  4. N$ _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Radioactivity

  2. Ozone effect

  3. Solar reaction

  4. Greenhouse effect
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

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

  1. Greenhouse effect

  2. Solar effect

  3. Ozone layer effect

  4. Radioactive effect
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

The term greenhouse effect was given by

  1. Fourier

  2. Tyndall

  3. Arrhenius

  4. Linnaeus
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

Increase in atmospheric temperature due to $CO _2$ is

  1. Pasteur effect

  2. Blackman effect

  3. Emerson effect

  4. Green-house effect
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

Green house effect is increase in temperature of earth due to

  1. High concentration of $NO _2$
  2. High concentration of $SO _2$
  3. High concentration of $CO _2$

  4. High concentration of CO
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice biology global environmental change causes of greenhouse effect greenhouse effect pollution and its effects

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Chlorofluorocarbons $(CFC _{s})$
  2. Molecular oxygen $(O _{2})$
  3. Nitrous oxide $(N _{2}O)$
  4. Carbon dioxide $(CO _{2})$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Greenhouse gases are those that absorb infrared radiation. Molecular oxygen (O2) and nitrogen (N2) are symmetric diatomic molecules and do not absorb infrared radiation, so they do not contribute to the greenhouse effect.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The greenhouse effect traps heat in the atmosphere, keeping the Earth's surface significantly warmer than it would be otherwise. Without it, the average temperature would be much lower.