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Questions Related to evs - i

Which of the following defines the effect of deforestation on earth?

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

  1. Increased chances of desertification, droughts, floods

  2. Increase in the level of $O _2$

  3. Global warming

  4. Both A and C

Show answer
Correct Option: D
Explanation:
Effects of deforestation on the Earth:
As a result of deforestation, chances of desertification, droughts, floods, etc. increase. Deforestation can also increase the level of CO$ _2$ in the Earth, it will lead to an increase in temperature i.e., global warming. As a result, the entire natural water cycle will get disrupted. This again increases the risk of natural calamities.
Global Warming is the increase of Earth's average surface temperature due to the effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth.
Hence, the correct answer is option D.

Which of the following defines the effect of deforestation on villages? 

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

  1. Top layer of the soil will be easily removed

  2. Soil erosion

  3. Less fertile soil

  4. All of the above

Show answer
Correct Option: D
Explanation:

Effects of deforestation on villages- Roots of plants hold soil particles together. In the absence of plants, the top layer of the soil will be easily removed by the action of high-speed winds or water flow. Thus, deforestation increases the chances of soil erosion. As a result, soil loses humus and become less fertile. Hence, a fertile land, which is a source of living for farmers in villages, gets converted into a desert.

Therefore, the correct answer is option D.

Which of the following defines the effect of deforestation on wild animals?

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

  1. Habitat of wild animals is developed, then their numbers would automatically decline.

  2. Habitat of wild animals is destroyed, then their numbers would automatically decline.

  3. Habitat of wild animals is destroyed, then their numbers would increase.

  4. All of the above.

Show answer
Correct Option: B
Explanation:
Deforestation is the clearing of forest which causes loss of habitat. If the habitat of wild animals is destroyed, then their numbers would automatically decline as they start moving towards urban and rural areas to meet their requirement and search a better option for their survival.
So, the correct answer is option B.

Deforestation is the major cause of

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

  1. Transpiration

  2. Genetic erosion

  3. Desertification of habitat

  4. All of the above

Show answer
Correct Option: C
Explanation:

Deforestation is the cutting of trees. When trees are lost due to deforestation, the result can be a drier climate and desertification, or the transformation of the once fertile land to desert.

Deforestation is the term that describes the cutting down or clearing of trees from a wooded area. 
Tree roots absorb water from the ground and return water vapor back to the atmosphere. If trees are removed and can no longer contribute to the water cycle and thus, transform into a much drier climate. This dry environment can spread due to a decrease in atmospheric water vapor and results in a decline in precipitation levels in the area and leads to the desertification
Thus, the correct answer is option C.

Deforestation generally decreases 

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

  1. Rainfall

  2. Soil erosion

  3. Drought

  4. Global warming

Show answer
Correct Option: A
Explanation:

When forests are destroyed, the atmosphere, water bodies and the water table are all affected. Trees absorb and retain water in their roots and some of this moisture is transpired into the atmosphere, regulates the water cycle. When this process is broken, the atmosphere and water bodies begin to dry out. 

Therefore, the correct answer is option A.

Frequent floods in plains of Northern India is due to

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

  1. Excessive rainfall

  2. Siltation of dams

  3. Deforestation in catchment areas

  4. Agriculture

Show answer
Correct Option: C
Explanation:

Frequent floods in plains of Northern India is due to deforestation in catchment areas. Deforestation in the catchment area has led to an increase in the silt content of the river flow. Bihar is India's most flood-prone State, with 76% of the population in the north Bihar living under the recurring threat of flood devastation.

Removal of vegetation cover has caused widespread erosion in Western Ghats, Uttar Pradesh and in Himachal Pradesh.

Deforestation leads to reduced rainfall due to

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

  1. Level of $CO _2$ in the atmosphere rises

  2. Global warming

  3. Disturbance in natural water cycle

  4. All of the above

Show answer
Correct Option: C
Explanation:

Green plants lose water by the process of transpiration. This contributes a lot towards atmospheric moisture. Thus, green plants have major contribution in precipitation. Due to this, deforestation leads to reduced rainfall. Thus, the correct answer is option C.

What are the consequences of deforestation?

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

  1. Soil erosion

  2. Loss of biodiversity

  3. Floods and droughts and climate change due to global warming

  4. All of the above

Show answer
Correct Option: D
Explanation:
Causes of deforestation are as follows:
  • Clearing land for human habitation and cultivation
  • The need of wood for building houses and factories.
  • The need of wood for making furniture.
Consequences of deforestation are as follows:
  • Soil erosion
  • Depletion of groundwater
  • Flash flood
  • Global warming
  • Loss of biodiversity
  • Droughts and climate change due to global warming

Desertification is due to

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

  1. Deforestation

  2. Soil-erosion due to water

  3. Soil-erosion due to wind

  4. Very high temperature and low rainfall

Show answer
Correct Option: A
Explanation:

Desertification is defined as a process of land degradation due to climatic variations and human activities. Overgrazing is the major cause of desertification worldwide. Other factors are urbanization, overdrafting of groundwater and deforestation. Thus the correct answer is option A.

Destroying a forest means destroying

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

  1. Ecosystem

  2. Plant life

  3. Population of wild life

  4. Food and shelter of wild animals

Show answer
Correct Option: A
Explanation:

Destroying a forest has many negative effects on the environment. Seventy percent of earth's terrestrial animals and plants live in forests. The most adverse impact is the loss of habitat for millions of species leading to disturbance in the food chain that is an important component of the ecosystem. Thus the correct answer is option A.