Tag: biology

Questions Related to biology

If there is no greenhouse effect, then the average temperature at surface of earth would have been 

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

  1. $ 15 $

  2. $ -18 $

  3. $ -6 $

  4. $ 10 $

Show answer
Correct Option: B
Explanation:
Greenhouse gases like $ { CO } _{ 2 }, { CH }{ 4 } $ and $ { CFC } _{ s } $ are essential for keeping the earth warm and hospitable. They prevent a substantial part of long wave radiations emitted by earth to escape into space, but these gases radiate a part of this energy back to the earth. This phenomenon is called greenhouse effect. Because of green house effect, the mean annual temperature of earth is $ 15. $ In its absence, it will fall to $ -18. $
So, the correct answer is '$ -18. $'

Which of the following is correct regarding 'El Nino' effect?

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

  1. Temperature rise leads to odd climatic changes

  2. Cutting down the use of fossil fuels

  3. Planting more trees

  4. Slowing down the growth of human population

Show answer
Correct Option: A
Explanation:
The rise in temperature due to global warming is leading to deleterious changes in the environment and resulting in odd climatic changes like EL Nino effect. El Nino effect is the abnormal warming of surface ocean water. It affects the weather in large parts of the world. Moisture carrying capacity of air will increase. Pattern of air-mass movement will change. Precipitation will increase at higher latitudes both in summer and winter and in southern as well as Eastern Asia in summer. Frequency of droughts and floods  will increase. Threat to human health will increase in tropical and subtropical countries due to changed ranges of disease vectors and water borne pathogens.
So, the correct answer is 'Temperature rise leads to odd climatic changes'.

Warm ocean surge of Peru current recurring every 5-8 years or so in the East Pacific of South America is widely known as.

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

  1. Gulf Stream

  2. Aye Aye

  3. El Nino

  4. Mangox

Show answer
Correct Option: C
Explanation:

EI Nino describes the unusual warming of surface waters in the eastern tropical pacific ocean. This occurs when the normal trade winds weaken or get reverse which lets the warm water flow in the eastern Pacific instead towards the west. Thus it forms oscillation in the ocean-atmosphere.

So,the correct answer is option C.

Which of the following cause green house effect?
(i) Deforestation
(ii) Emission of gases from factories
(iii) Melting of polar ice

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

  1. Only (i) and (ii)

  2. Only (i) and (iii)

  3. Only (ii) and (ii)

  4. (i), (ii) and (iii)

Show answer
Correct Option: A
Explanation:
Deforestation is removal, decrease or deterioration of forest cover of an area. It causes the change in climate, floods, soil erosion, siltation, cyclones, drought, desertification and increased level of carbon dioxide (greenhouse gas) in the atmosphere. Greenhouse gases like carbon dioxide and CH$ _4$ that are also released from factories cause green house effect.

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. $SO _2$

Show answer
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$

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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'.