Tag: evs - i

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Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Which of the following is the cause of deforestation?

  1. Urbanization

  2. Agricultural activities

  3. Forest fires

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As the population increases, the need for land also increases, forests are cleared for the construction of roads and malls and buildings. The demand of food grains also increases, so it calls for clearing more trees and growing food crops. Forest fires also cause deforestation.

So, the correct answer is option D.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Which of the following is the natural cause of deforestation?

  1. Urbanization

  2. Forest fires

  3. Agricultural activities

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Forest fires are naturally caused and not man made like urbanization and agricultural activities, hence, they are the only natural cause of deforestation. Natural fires are caused by lightning, with a very small percentage started by spontaneous combustion of dry fuel such as sawdust and leaves. Human activities may also lead to forest fire.

So, the correct answer is option B.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Match the following.

   List I    List II
 i   Deforestation  a   Urbanization
 ii  Natural cause of deforestation  b  Cutting of forests
 iii  Man-made cause of deforestation  c  Droughts

  1. I- b, II- a, III- c

  2. I- a, II- b, III- c

  3. I- c, II- a, III- b

  4. I- b, II- c, III- a
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deforestation means cutting down of forests. Droughts are natural causes of deforestation and urbanization is the man-made cause of deforestation. The most dramatic impact is a loss of habitat for millions of species. Seventy percent of Earth's land animals and plants live in forests, and many cannot survive the deforestation that destroys their homes.

So, the correct answer is option D.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Give examples of natural causes of deforestation.

  1. Forest fires

  2. Drought

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Natural causes of deforestation are forest fires, droughts, exotic animals, floods, climate change, and overpopulation of foreign animals. All of these add to deforestation. Forest fires burn trees in large amounts. Many animals depend on trees for shelter. When a drought occurs, trees won’t have water to survive, also leaving animals without a stable home. Also, when animals that are not from the area come and make it their habitat, they take food, water and space up that need to be used by native animals. 

So, the correct answer is option C.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Deforestation means

  1. Planting more trees

  2. Designing a forest

  3. Demanding a forest

  4. Clearing of forests and using that land for other purposes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deforestation is the permanent clearing of forests to make the land available for other uses. The main reasons for deforestation are overpopulation, urbanization, wood requirement, obtaining land for cattle-grazing. There has been a considerable decrease in the number of plant and animal species due to deforestation.  Other ill-effects are rise in pollution, global warming and soil erosion. Thus the correct answer is option D.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Ill effect of deforestation is that, it

  1. Increases temperature of earth

  2. Increases pollution level
  3. Increases CO$ _2$ level of atmosphere

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

the correct answer is 'all of the above'

Deforestation causes decrease in number of trees which can consume CO2 and give out oxygen thus there is an increase in atmospheric CO2 levels. The plants also filter out pollutants from the air , thus deforestation causes increase in pollution level.All these things collectively cause an increase in temperature of earth by increased CO2 levels causing green house effect,this is known as global warming.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Which of the following is not true about deforestation?

  1. Population explosion is one of the reasons for deforestation

  2. Cleaning of forest for agriculture causes deforestation

  3. Deforestation is taking place only in developing courtiers

  4. Cash crop economy of third world is a cause of deforestation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cash crop economy of third world is a cause of deforestation is not true for deforestation rest all options  are the reasons for deforestation.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Which of the following activities increase the concentration of carbon dioxide in the atmosphere?
(i) Deforestation
(ii) Combustion of fuel
(iii) Over hunting

  1. Deforestation

  2. Combustion of fuel

  3. Over hunting

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deforestation and combustion of fuel increase the concentration of carbon dioxide in the atmosphere. Deforestation is the excessive cutting down of trees which increases the carbon dioxide concentration in the atmosphere. Fuels burns in the atmosphere in the presence of oxygen. Burning of fuel in the sufficient supply of oxygen leads to the production of carbon dioxide while the insufficient supply of oxygen leads to the production of carbon monoxide.

So, the correct answer is option D.

Multiple choice evs - i forests: our lifeline afforestation deforestation and its effect deforestation

Deforestation may reduce the chances of

  1. Rainfall

  2. Land slides

  3. Soil erosion

  4. Frequent cyclones
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Trees play a crucial role in the water cycle through transpiration, which contributes to cloud formation and rainfall. Removing forests reduces this process, thereby decreasing the likelihood of rainfall in the area.