Tag: ozone layer depletion and causes

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Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

A natural phenomenon that becomes harmful due to pollution is _____________.

  1. Global warming

  2. Ecological balance

  3. Greenhouse effect

  4. Desertification
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Solar radiation is absorbed in the Earth's surface and emitted as thermal energy that can be re-absorbed by greenhouse gases. Greenhouse gases include water vapor, carbon dioxide, ozone, and methane; the major components of atmospheric gas nitrogen, oxygen, and argon are transparent to infrared radiation. The greenhouse effect insulates the earth's surface, making it hospitable to life; however, human activities have increased the concentration of these gases, causing global warming.

So, the correct answer is 'Greenhouse effect'.

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Assertion :Green - house effect is due to thick layer of carbon dioxide.

Reason :The glass panels of a green - house allowing the sunlight to filter through but preventing the heat from being re-radiated in outer space.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The assertion that the greenhouse effect is due to a thick layer of CO2 is an oversimplification, as it involves multiple gases and processes. The reason correctly describes how a greenhouse works, but it does not explain why the greenhouse effect on Earth is specifically attributed to a 'thick layer of CO2'.

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Which one of the following is not a green house gas?

  1. $CO _2$
  2. $CH _4$
  3. $O _2$

  4. CFCs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Greenhouse gases are called so because they are capable of absorbing the insolation from the sun and keeping it within the troposphere, thereby increasing the overall temperature of the earth, called global warming. Carbon dioxide, methane, nitrous oxide, ozone, Chlorofluorocarbons and sulphur hexafluoride are considered to be the potent greenhouse gases. Oxygen is not a greenhouse gas.

Hence, the correct answer is 'O$ _{2}$' 

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Surface of earth is kept warm by

  1. Solar radiations

  2. Geothermal energy

  3. Green house flux

  4. Absorption of infra-radiations by green house gases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The gases in the troposphere of the atmosphere absorb the sun radiations and trap them so that they do not reflect back. This process allows the heat to remain trapped with in the atmosphere and the earth surface remains warm. This process is called greenhouse effect and the absorbed radiations striking the earth's surface are called green house flux. Carbon dioxide, water vapour, oxides of nitrogen are useful for this purpose. 

Hence, the correct answer is 'Green house flux'.

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Green house gases include

  1. $CO _2, CHC, CH _4$ and $N _2O$
  2. $CO _2, O _2, N _2, NO _2$ and $NH _3$
  3. $CH _4, N _2. CO _2$ and $NH _3$
  4. $CFC, CO _2, NH _3$ and $N _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A greenhouse gas absorb radiation and emit heat energy maintaining the Earth's temperature. However, when released in excess amounts, they cause global warming. Sources are volcanic eruptions, burning of fossil fuels, deforestation, vehicular exhausts, industrial emissions etc. contribute to the greenhouse gases. Carbon dioxide, Chlorinated hydrocarbon (CHC), Methane and oxides of nitrogen are considered to be the major greenhouse gases.

Hence, the correct answer is 'CO$ _{2}$, CHC, CH$ _{4}$ and N$ _{2}$O'

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Which is not a green house gas?

  1. Chlorofluorocarbon

  2. Methane

  3. Carbon dioxide

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Greenhouse gases cause greenhouse effect by trapping the infrared radiation trying to escape back to space. This process increases the earth’s temperature. Gases which contributes in greenhouse effect are carbon dioxide, methane, nitrous oxide, ozone, water vapour, Chlorofluorocarbons (CFCs) and, Hydrofluorocarbons (HCFCs and HFCs). Hydrogen is not a greenhouse gas.
Hence, the correct answer is ‘Hydrogen’.
Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Methane gas producing field is

  1. Wheat field

  2. Paddy field

  3. Cotton field

  4. Groundnut field
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Paddy or the rice fields are water-logged to allow the growth of the rice crops. Due to the respiration, the carbon dioxide is released in heavy amounts by the bacteria present in the water-logged soil. However, as the season progresses, the methane-releasing bacteria are seen to occupy the paddy field. Together with the carbon dioxide, the methane becomes a greenhouse gas resulting in global warming

So, the correct answer is 'Paddy field'

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

A green house gas is

  1. $H _2$

  2. CO
  3. $CO _2$
  4. $N _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A greenhouse gas absorb radiation and emit heat energy maintaining the Earth's temperature. Sources are volcanic eruptions, burning of fossil fuels, deforestation, vehicular emission, industrial exhausts etc. which have increased the concentration of carbon dioxide in the atmosphere. The oxygen and hydrogen are transparent gases having symmetrical molecules of identical atoms, unable to rotate and vibrate.

Hence, the correct answer is 'CO$ _{2}$'.

Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Ozone is

  1. Protector in troposphere

  2. Pollutant in troposphere

  3. Green house gas

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ozone is a significant gas in the stratosphere because it absorbs the UV rays and do not allow them to reach the earth's surface. There it is formed by the reaction of oxygen with UV rays. However, tropospheric or ground-level ozone is formed as a secondary pollutant and is harmful. It acts as a major constituent of the photochemical smog. It also traps and reflect back the infra-red rays coming from the earth's surface. Here, it is formed when the primary pollutants react with the oxygen in the presence of sunlight. So, it acts as a greenhouse gas.

Hence, the correct answer is 'Both B and C'.