Tag: global environmental change

Questions Related to global environmental change

Ozone hole over Antarctica appears during

commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

  1. Late August- Early October

  2. March- April

  3. October- November

  4. January- February

Show answer
Correct Option: A
Explanation:

Polar spring, also known as the Antarctic Spring is the period from late August to early October and the strong westerlies circulate around the Antarctic continent creating a polar vortex. The polar vortex results in the formation of the polar stratospheric clouds which trap most of the gases including the ozone-depleting factors like CFCs, methyl bromide etc. 

Hence, the correct answer is 'Late August - Early October'

Ozone hole over Antarctica was first detected by

commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

  1. Molina and Rowland

  2. Farman et al

  3. Augus

  4. Molina and Molina

Show answer
Correct Option: B
Explanation:

The discovery of the ozone hole over Antarctica was done by British Antarctic Survey Scientist Farman, Gardiner and Shanklin and reported in the Nature journal in May 1985. The ozone hole is defined as the area in the atmosphere where the value of the ozone is less than 220 DU. Paul Crutzen, Mario Molina and Sherwood Rowland gave the observation of CFCs in degradation of the ozone.

Hence, the correct answer is 'Farman et al'.

Ozone hole is widest over

commercial applications global environmental change ozone and its depletion ozone layer ozone layer depletion and causes

  1. Equator

  2. North pole

  3. North temperate area

  4. Antarctica

Show answer
Correct Option: D
Explanation:

The ozone layer in the stratosphere is created by the interaction of the UV radiation from the sun and the oxygen. It is capable of absorbing the most damaging type of UV radiation called the UV-B. The ozone hole refers to the depletion of the ozone by the pollutants like CFCs, HCFCs and HFCs. The pollutants split up due to UV radiation and the nascent chlorine reacts with the ozone molecules to form the oxygen. Over Antarctica, the ozone is highly depleted and so the widest ozone hole is seen there. This is because of the presence of the stratospheric cloud in abundance.

Hence, the correct answer is 'Antarctica'

Which of the following are the correct approaches to reduce global warming ?
(i)   Use of fossil fuels 
(ii)   Improving efficiency of energy usage 
(iii)  Afforestation
(iv)  Increasing growth of human population

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

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

Show answer
Correct Option: B
Explanation:

To reduce global warming following measures must be taken:
(i)  cutting down the use of fossil fuel
(ii)  Improving efficiency of energy usage
(iii) Reducing deforestation
(iv) Planting trees and slowing down the growth of human population.

In the event of global warming, which one of the following is most likely to occur?

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Existing plant and animal communities will move North in response to warming.

  2. Agriculture in the prairie provinces will be redeveloped on soils of the Canadian Shield.

  3. The anticipated rise in sea level will be caused primarily by the melting of polar ice caps.

  4. The decomposition of organic matter in the unfrozen surface layer of polar soils will increase.

Show answer
Correct Option: C
Explanation:
It is believed that increase in concentration of greenhouse gases has resulted in rise of atmospheric temperature which is slight in tropics, moderate in middle latitudes and maximum in polar regions. Global warming could raise sea level due to thermal expansion of sea water, melting of glaciers and Greenland ice sheet. There is a danger of submersion of large area as one third of human population lives within 60 km of coastline. Coastal salt marshes and estuaries, wetlands, drylands, freshwater supplies, fisheries, fish breeding areas and other types of wildlife will undergo extinction.
So, the correct answer is 'The anticipated rise in sea level will be caused primarily by the melting of polar ice caps'.

Which of the following would happen in the presence of greenhouse effect in the atmosphere?

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Pollution will increase

  2. The earth's surface temperature will increase

  3. The earth's surface temperature remains the same,

  4. The depleted ozone layer will decrease the earth's temperature.

Show answer
Correct Option: B
Explanation:

Greenhouse gas like co$ _2$, methane, CFC absorbs the radiation reflected from the earth's surface in the form of heat and increases the atmosphere's temperature is called as greenhouse effect which leads to the global warming.

Global warming will cause.

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Rise is level of oceans

  2. Decrease in glaciers

  3. Reduction in ice caps

  4. All the above

Show answer
Correct Option: D
Explanation:

Global warming causes melting of polar ice caps. This decreases the size of glaciers and leads to the rise of oceans.

So, the correct option is 'All of the above'.

If global warming continues, organism facing severe threat is?

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Banana

  2. Dolphin

  3. Cow

  4. Snow Leopard

Show answer
Correct Option: D
Explanation:
Global warming is the continuous increase in temperature of earth's surface due to increase in concentration of greenhouse gases. The rise in temperature leads to melting of polar ice caps and this will lead to rise in sea level, due to which many coastal areas will get submerged.
Hence, if global warming continues, Snow Leopard will face severe threat as ice will melt due to global warming and its natural habitat will get destroyed.
So, the correct answer is 'Snow Leopard'.

Global Warming Clauses 
I. An increase in the sea level
II. The melting of ice at mountain peaks
III. A decrease in food production by plants

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. I only

  2. I and II

  3. II and III

  4. I,II and III

Show answer
Correct Option: D
Explanation:
In the given question, all the statements are correct because global warming has led to an increase in the average temperature of the Earth has led to the melting of ice in mountain peak resulting in higher sea levels global warming as also adversely affected the production and yield of crops.
So, the correct answer is 'I,II and III'

More than 70% of world's fresh water is contained in 

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Antarctica

  2. Glaciers and polar ice

  3. Greenland

  4. Polar ice

Show answer
Correct Option: B
Explanation:
Water covers three fourth portion of the Earth where marine water is up to 3.5%, freshwater present on land is 2.5%, most of the freshwater is present in glaciers and polar ice caps.
So, the correct option is 'Glaciers and Polar caps'