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

Earth's surface temperature can be altered, by changing concentration of

  1. Heat

  2. Greenhouse Gases

  3. Air pollutants

  4. All of above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Greenhouse gases regulate the Earth's temperature by absorbing and re-emitting infrared radiation. Changing their concentration directly alters the energy balance of the planet.

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

Which among the following is the most correct statement in context with Carbon footprint?

  1. It is a measure of Green house gas emissions by a product

  2. It is a unit under the Kyoto Protocol representing a reduction of greenhouse gases under the Joint Implementation mechanism

  3. It is a administrative approach used to control pollution by providing economic incentives for achieving reductions in the emissions of pollution

  4. All of above are correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A carbon footprint is defined as the total amount of greenhouse gases, including carbon dioxide and methane, generated by our actions or by a specific product.

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

Major source of methane in India is

  1. Rice fields

  2. Sugarcane plantation

  3. Wheat fields

  4. Fruit orchards
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In India, paddy or rice cultivation is done across the different regions and in different seasons. The availability of the monsoon and irrigation facility further promote the paddy cultivation. The paddy cultivation occurs in water logged condition and favours the release of methane after the bacteria has respired aerobically. So, the methane release in the country is largely due to the rice fields. Sugarcane plantations, wheat fields and fruit orchard do not need water-logged condition.

So, the correct answer is 'Rice fields'

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

Gas being produced by paddy fields and involved in global warming is

  1. Chlorine

  2. Methane
  3. $CO _2$
  4. $H _2S$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The microbes in the paddy field respire and release the carbon dioxide. The increase in carbon dioxide increases the nearby temperature. This further results in the release of methane. Methane, in combination with carbon dioxide becomes a potent greenhouse gas. They trap the sun radiations, preventing them from reflecting back and falling on the earth's surface. This results in raising the overall global temperature. 

Hence, the correct answer is 'Methane'.

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

Which green-house gas other than methane is being produced by agricultural fields?

  1. Nitrous oxide

  2. Ammonia

  3. Sulphur dioxide

  4. Arsenic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrous oxide is a powerful greenhouse gas produced by soil cultivation practices, especially the use of commercial organic fertilizers (including manure), biomass burning etc, This is done by a process of nitrification which converts the nitrogen in fertilizer to the production of nitrous oxide. The excessive use of the fertilizers thereby results in an increase in the nitrous oxide production.

Hence, the correct answer is 'Nitrous oxide'.

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

$CO _2, CH _4, N _2O, CFCs$ are called green house gases because they can absorb

  1. Ultraviolet radiations

  2. Long wave infra-red radiations

  3. Visible light radiation

  4. X-ray radiation
  5. $\gamma$-ray radiation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The greenhouse gases are called so because they absorb the long wave infra-red radiations reflected from the earth's surface and trap them such that they do not get reflected back to space. This trapping of the long wave infra-red radiations causes an increase in the temperature of the atmosphere, called global warming. CO$ _{2}$, CH$ _{4}$, N$ _{2}$O, CFCs are the gases that are capable of showing greenhouse effect. These have increased in the concentration over the years due to the anthropogenic activities.

Hence, the correct answer is 'Long wave infra-red radiations'.

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

What is relative contribution of $CO _2, CH _4$, CFC and $N _2O$ to global warming?

  1. $20\%, 14\%, 60\%, 6\%$
  2. $14\%, 6\%, 20\%, 60\%$
  3. $60\%, 20\%, 14\%, 6\%$
  4. $6\%, 14\%, 20\%, 60\%$
  5. $20\%, 60\%, 14\%, 6\%$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Global warming potential (GWP) is a measure of how much heat a greenhouse gas traps in the atmosphere up to a specific time horizon, relative to carbon dioxide. It compares the amount of heat trapped by a certain mass of the gas in question to the amount of heat trapped by a similar mass of carbon dioxide and is expressed as a factor of carbon dioxide an index of global warming potential for methane, carbon monoxide, nitrous oxide and CFCs relative to that of carbon dioxide. The major contribution is from CO$ _2$ (60%),CH$ _4$ (20%), CFC and N$ _2$O attributes to 14% and 6% respectively.

So the correct answer is '60%,20%,14%,6%'.