Tag: pollution of soil

Questions Related to pollution of soil

What is the importance of forest as a resource?

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  1. It improves water holding capacity of soil.

  2. It provides habitat, food, protection to wild life.

  3. It help in balancing $CO _{2}$ and $O _{2}$ of atmosphere.

  4. All of the above.

Show answer
Correct Option: D
Explanation:
Forests and biodiversity is key to all life forms. The richer the diversity of life, the greater the opportunity for medical discoveries, economic development and adaptive responses to such new challenges as climate change.
Forests are renewable resources which provide
(a) Habitat, food, protection to wildlife.
(b) Help in balancing CO$ _2$ and O$ _2$ of atmosphere.
(c) Improves water holding capacity of soil.
(d) Regulates water cycle.
(e) For human being, they are the source for all essential commodities like, fuel wood, timber pulp and paper etc.
(f) It provides useful products like fruits, resins, gums, essential oils, bidi wrapper etc. 
Therefore, the correct answer is option D.

When we destroy forest, what we are actually destroying?

evs - i the environment and us damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

  1. Only food for the wild life

  2. Only wild life's habitat

  3. Only trees

  4. Only environment

Show answer
Correct Option: D
Explanation:

Forests are important for the environment as well as human life.

  1. Half of the earth's oxygen is generated by forests. Thus cutting down forests will cause gradual depletion of oxygen.
  2. Forests support wildlife and are the shelter for these animals. Destroying them will cause death and extinction of these wildlife animals.
  3. The trees absorbs the carbon dioxide generated by industries, transportation and other human activities. Most of the pollution control is brought about by forests.
  4. Forests control floods.
  5. They also help in regulating regional climate.
Thus destroying forests is indirectly destroying the environment.

Forest destruction results in 

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  1. Loss of wild life

  2. Famine, floods and drought

  3. Soil erosion

  4. All of the above

Show answer
Correct Option: D
Explanation:

Deforestation is the cutting of trees which disturbs the equilibrium of a healthy environment. It increases the carbon dioxide content in the atmosphere and contributes to global warming. They produce oxygen and regulates the water cycle by releasing water vapour into the atmosphere. Without trees, forest lands can quickly become barren land. It also causes loss of wildlife, due to the loss of its habitat. Deforestation leads to famine (scarcity of food), flood, and drought as well as loosened soil causes soil erosion. Thus, the correct answer is option D.

If forest cover is reduced to half, what is most likely to happen on a long term basis? 

evs - i the environment and us damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

  1. Tribals living in these areas will starve to death.

  2. Domestic animals in these and joining areas will die due to lack of fodder.

  3. Large biomes will become deserts.

  4. Crop breeding programes will suffer due to a reduced ability of variety of germplasm.

Show answer
Correct Option: A
Explanation:

If forest cover is reduced to half, it would adversely affect the inhabitants. In rural areas, a community of people lives in the forest as a part of their tradition. They are completely dependent on the forest for their basic needs. They worship the trees and consider it as their ancestral belongings. The dependent tribals on a particular forest will be harmed by the clearing of the forest.

What is not useful to increase agriculture production?

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  1. Mechanisation of agriculture

  2. Enhanced irrigation facilities

  3. Use of fertilizers

  4. Deforestation

Show answer
Correct Option: D
Explanation:

Deforestation is the excessive cutting down of the trees which adversely affects the environment. It is not useful for increasing the agricultural production as because it creates several major problems like soil erosin, infertility, and droughts.

In the recent years, there has been an increasing incidence of floods in the plains of northern India, because

evs - i the environment and us damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

  1. There has been an increase in annual rainfall.

  2. The rate of silting of dams has gone lip.

  3. There has been increased deforestation in the catchment areas.

  4. Increased areas of land is being self cultivated.

Show answer
Correct Option: C
Explanation:

Deforestation is the removal of forest that can cause flooding. Coastal vegetation reduces the impact of waves and winds associated with a storm surge. Without this vegetation, coastal villages are susceptible to damaging floods. When trees are there, the roots are able to hold the soil and prevent erosion. When the roots are gone after deforestation, the soil can be errode and causes flood or other natural disasters.

Therefore, the correct answer is option C.

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

evs let's plant trees damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

  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'.