Tag: forests: our lifeline

Questions Related to forests: our lifeline

Deforestation means

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

  1. Planting more trees

  2. Designing a forest

  3. Demanding a forest

  4. Clearing of forests and using that land for other purposes

Show answer
Correct Option: D
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.

Ill effect of deforestation is that, it

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

  1. Increases temperature of earth

  2. Increases pollution level

  3. Increases CO$ _2$ level of atmosphere

  4. All of the above

Show answer
Correct Option: D
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.

Which of the following is not true about deforestation?

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

Show answer
Correct Option: D
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.

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

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

  1. Deforestation

  2. Combustion of fuel

  3. Over hunting

  4. Both A and B

Show answer
Correct Option: D
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.

Deforestation may reduce the chances of

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

  1. Rainfall

  2. Land slides

  3. Soil erosion

  4. Frequent cyclones

Show answer
Correct Option: A

What would happen if forest disappears?

commercial studies forests: our lifeline afforestation deforestation and its effect deforestation

  1. Flood

  2. Global warming

  3. Extinction of animal

  4. All of the above

Show answer
Correct Option: D
Explanation:

Answer is option D i.e. "All of the above"
Deforestation(disappearance of the forest) is when humans remove or clear large areas of forest lands and related ecosystems for non-forest use.

  • Without trees, rain runs off soil into rivers and streams i.e soil erosion, raising the water level which leads to floods.
  • When deforestation takes place it results in an increase in carbon dioxide concentration in the atmosphere which results in global warming.
  • If forests are destroyed, animals and other creatures of the forests will come out to human settlements searching for a place to stay. They will be killed more, thus leading to their extinction.

The level of pollution increases due to whch of the following activity?

commercial studies forests: our lifeline afforestation deforestation and its effect deforestation

  1. Deforestation

  2. Aforestation

  3. Nitrogen cycle

  4. None of the above

Show answer
Correct Option: A

Which of the following factors increases the temperature of the forests?

commercial studies forests: our lifeline afforestation deforestation and its effect deforestation

  1. Increase in percentage of carbon dioxide

  2. Excessive leaching

  3. Afforestation

  4. All of the above

Show answer
Correct Option: A

Which of the following will be affected due to the absence of forest?

commercial studies forests: our lifeline afforestation deforestation and its effect deforestation

  1. Food and shelter of animals

  2. Percentage of carbon dioxide

  3. Percentage of oxygen

  4. All of the above

Show answer
Correct Option: D

Trees are known as lungs of forest.

commercial studies forests: our lifeline afforestation deforestation and its effect deforestation

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Trees in general are known as 'lungs of Earth' because they absorb large amounts of carbon dioxide and release large amounts of oxygen due to photosynthesis. This helps maintain a balance between the proportion of oxygen and carbon dioxide in the atmosphere as the oxygen released by the plants during photosynthesis is utilized by various organisms including plants for respiration.

So, the correct answer is 'True'