Tag: human influences on the environment

Questions Related to human influences on the environment

Carbon dioxide is called a green house gas because

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

  1. It emits light

  2. It traps infra red radiations

  3. It traps ultraviolet radiations

  4. It is involved in photosynthesis

Show answer
Correct Option: B
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. Carbon dioxide traps the infra red radiations and accounts for greatest contribution to greenhouse effect.
So, the correct answer is 'It traps infra red radiations'.

Which greenhouse gas contributes 20% to global warming?

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

  1. Methane

  2. N$ _2$O

  3. CFCs

  4. CO$ _2$

Show answer
Correct Option: A
Explanation:
he 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%
So, the correct answer is 'Methane'.

Earth is kept warm due to green house flux.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
Greenhouse flux occurs due to the accumulation of greenhouse gases. Gases like carbon dioxide, methane, nitrous oxide trap radiations and absorb the light. The energy gets trapped in the earth and this causes a rise in temperature of the earth causing it to become warmer. This is called the greenhouse effect. Carbon dioxide has a maximum contribution in the greenhouse effect. It also maintains optimum earth temperature as less concentration of carbon dioxide will lead to loss of heat from earth causing a decrease in temperature. However, excess concentration of carbon dioxide can lead to an increase in earth's temperature causing global warming.
Hence, the statement given in the question is correct.
So, the correct answer is 'True'.

$CO _2$ absorbs some of the ....... that radiates from the surface of Earth to space

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

  1. ozone

  2. heat

  3. ultraviolet light

  4. smog

Show answer
Correct Option: B
Explanation:
CO2 is a greenhouse gas. When radiations of the sun reach earth, they are reflected back from the earth's surface. CO2 absorbs some of the radiation and prevents it from getting escaped due to which the temperature of earth rises. This is called the greenhouse effect. Excess concentration of CO2 thus, can lead to an abnormal increase in earth's temperature and cause global warming. 
So, the correct answer is 'heat'.

Gases commonly referred as green house gases are :

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

  1. $CH _4$

  2. $CO _2$

  3. CFC

  4. $NH _3$

Show answer
Correct Option: A,B,C
Explanation:
Greenhouse gases absorbs radiations from sun that are reflected back from earth's surface. In this way, they prevent the radiations from escaping. These gases can cause greenhouse effect in which there is warming of earth's surface. Gases like methane (CH4), carbon dioxide (CO2), CFC (Chlorofluorocarbon) and Nitrous oxide (N2O) are greenhouse gases. Excess concentration of greenhouse gases in atmosphere can cause global warming.
So, the correct answer is options 'A, B and C'. 

The main green house gas is

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

  1. Ozone

  2. Oxygen

  3. Helium

  4. Cardon dioxide

Show answer
Correct Option: D
Explanation:

Greenhouse gases are the gases that contribute to the greenhouse effect by absorbing the earth's heat and re-radiating it towards the earth. Carbon dioxide is the highest (among gases) contributor towards greenhouse effect and contributes about 9-26%, followed by methane (contributes 4-9%), and ozone (3-7%). Over the past few years, carbon dioxide has caused most of the global warming as it is present in abundance in the atmosphere and its amount is increasing over the years. So, even though other gases have a more contributing effect per molecule, the amount of carbon dioxide is so high that it contributes more than the other gases. Due to this carbon dioxide is considered the main greenhouse gas. 

Thus, the correct answer is 'Carbon dioxide.' 

The true statement about 'Green -house effect' is that it is

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

  1. Caused by combination of many gases

  2. Caused only by $CO _2$

  3. Caused by $CO _2,CFC,CH _4$ and $NO _2$ gases

  4. None of the above

Show answer
Correct Option: A
Explanation:
Greenhouse effect is the phenomenon in which radiations from the sun are trapped in the earth's surface and this causes the warming of surface and increase in temperature of earth. Various gases such as carbon dioxide and carbon monoxide trap the heat radiations that enter the earth's surface and promotes greenhouse effect. Such gases are called greenhouse gases. Approximate contribution of different gases to greenhouse effect is as follows:
  • Carbon dioxide (CO2)- 60%
  • Methane (CH4)- 20%
  • Chlorofluorocarbons (CFC)- 14%
  • Nitrous oxide (N2O)- 6%
Hence, greenhouse effect is caused by combination of many gases.
So, the correct answer is 'Caused by combination of many gases'.

Whale washed ashore will die because of?

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

  1. Increase in body temperature

  2. Incapability to breathe

  3. Crushing of bones under body weight

  4. Cracking skin

Show answer
Correct Option: A
Explanation:

Avails cannot try photo photo there are number of various reasons why they are unable to live on land first of all their bodies are not designed to hold the weight on the land which is unknown by and environment secondly they have a thick layer of blubber which is fatty tissue and lack of water well quickly overheat get dehydrated and try out the temperature of the water is essential for the survival correct option is increasing body temperature

Green house gases of the following

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

  1. $CO, CO _2$

  2. $SO _2, CO _2$

  3. $CO _2$ methane

  4. Co and Methane

Show answer
Correct Option: A

What is the man-made green house gas known as?

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

  1. Carbon dioxide

  2. HFC

  3. Ozone

  4. Water Vapour

Show answer
Correct Option: B