Tag: protecting our environment

Questions Related to protecting our environment

What are the advantages of reforestation?

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  1. It helps to reduce the concentration of CO$ _2$ in the environment.

  2. It has the potential to preserve endangered species.

  3. It can reverse the damage done by erosion.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Deforestation results in an increase in CO$ _2$ concentration in the atmosphere, greenhouse gasses like CO$ _2$ and methane significantly contribute to a changing climate. Reforestation involves the planting of the trees of same species. It is an effective method to reduce CO$ _2$ in the atmosphere, it also helps in restoring habitat loss and also helps in fighting against climate change and help in restoring endangered species from extinction.

Thus, the correct answer is option D.

An ecologist wants to study the impact of habitat fragmentation on a forest ecosystem. Which of these would be the least impactful way to study the potential effect of habitat fragmentation while giving the most useful information? 

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  1. Using a computer model to generate possible outcomes

  2. Observing a fragmented prairie ecosystem

  3. Deforesting an ecosystem and observing the effects

  4. Hypothesizing about what might be possible outcomes of fragmentation

  5. Experirmenting on a small patch of trees in a controlled area

Show answer
Correct Option: B
Explanation:
Effects of habitat fragmentation on forest ecosystem can be best studied in small and isolated populations. Prairie is a kind of dog. Prairie ecosystem is highly fragmented and effects of habitat fragmentation can't be studies easily in such fragmented ecosystems.
So, the correct answer is 'Observing a fragmented prairie ecosystem'.

Which of these is an example of an ecological intervention?

I. Toxic site remediation
II. Large-scale reforestation
III. Introduction of new species

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  1. I only

  2. II only

  3. III only

  4. I and III only

  5.  I, II and III

Show answer
Correct Option: E
Explanation:
Ecological intervention is use of conventional ways to deal with environment emergencies for its protection and conservation.
I. Toxic site remediation is the removal of contaminants and other polluting substances from the site.
II. Large scale reforestation is the plantation of trees for removing pollution from the atmosphere.
III. Introduction of new species to increase the biodiversity is also a conventional way of ecosystem conservation.
So, the correct answer is 'I, II and III'.

Concentration of green house gases is increasing due to

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  1. Deforestation

  2. Increased use of refrigerators

  3. Increased combustion of coal and petroleum

  4. All of the above

Show answer
Correct Option: D
Explanation:

The greenhouse gases are capable of trapping and reflecting the sun's radiations on the earth's surface. Examples include carbon dioxide, methane, nitrous oxides etc. These are naturally released by activities like volcanic eruptions, forest fires, respiration etc. But their increased levels have occurred due to the anthropogenic activities like deforestation, increased use of refrigerators (releasing CFCs) and increased combustion of coal and petroleum (releasing oxides of nitrogen, sulphur and carbon). Because of the increase in their levels, they have caused climate change by global warming.

Hence, the correct answer is 'All of the above'.

A successful forest conservation strategy should involve

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  1. protection of animals at the highest trophic level

  2. protection of only sonsumers

  3. protection of only herbivores

  4. comprehensive programme to protect all the physical and biological components

Show answer
Correct Option: D

An inexhaustible non-conventional universal source of energy is

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  1. Wind energy

  2. Solar energy

  3. Hydrothermal energy

  4. Tidal energy

Show answer
Correct Option: B
Explanation:

Solar energy is inexhaustible non-conventional resource. Its use is yet to pick up because of requirement of back up system to store and generate electricity during night and during cloudy days. There are three methods of harnessing solar energy- direct heating (e.g., solar cookers), thermoelectric conversion or solar thermal power plants, e.g., steam generation and photovoltaic conversion.

Universal nonpolluting source of energy is

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  1. Fossil fuel

  2. Sun

  3. Nucleus

  4. Wind and water

Show answer
Correct Option: B
Explanation:

Renewable source of energy include biomass energy and some forms of inexhaustible energy like solar energy, hydropower, wind power, tidal energy, wave energy, geothermal energy etc. 

Solar energy is universal, inexhaustible, non-conventional resource, which is non-polluting. It is considered universal because solar energy is available on all places and it does not leads to any type of pollution. However, it may not be harnessed easily. Green plants trap solar energy and convert it into chemical energy stored in sugars, which are utilised by all other organisms.

Source of energy which does not evolve CO$ _{2}$ is

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  1. Coal

  2. Oil

  3. Organic compounds

  4. Nuclear energy

Show answer
Correct Option: D
Explanation:

Coal and oil are fossil fuels been derived from dead bodies of plants and animals, which existed in past. Hence, they are carbon compounds and emit carbon dioxide on combustion. Organic compounds are obviously compounds of carbon and will evolve carbon dioxide on combustion. Nuclear energy is non conventional, non renewable resource. Nuclear fission (now fusion also) of selected radioactive materials yields large amount of heat energy. For example one amu of Uranium - 235 yields energy equal to burning of 15 metric tonnes of coal. The energy released in nuclear fission and fusion is not due to combustion process and hence, does not evolves carbon dioxide.

From the list given below, pick the item that is not a natural resource.

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  1. Soil

  2. Water

  3. Electricity

  4. Air

Show answer
Correct Option: C
Explanation:

Electricity can be created/generated and is man-made. Air, water and soil are all natural resources and cannot be created by humans.

Which of the following is the most appropriate definition of a natural resource?

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  1. It is present only on land.

  2. It is a gift of nature, which is very useful to mankind.

  3. It is a man-made substance placed in nature.

  4. It is available only in the forest.

Show answer
Correct Option: B
Explanation:

Natural resources occur naturally in our environment. They cannot be created by man.