Tag: evs - i

Questions Related to evs - i

Which one of the following statements is false?

evs - i community health and hygiene disorders of nervous system drug, tobacco and alcohol consumption addiction and dependence

  1. Psychoactive drugs have the ability to alter the activity of the nervous system

  2. Adolescence is marked by accelerated physical growth, development of reproductive organs and changes in functioning of the neuroendocrine system

  3. Hallucinogen can alter a person's thoughts, feelings and perceptions

  4. Mescaline is a stimulant

Show answer
Correct Option: D
Explanation:

Mescaline is a hallucinogen and a recreational drug it has a similar effect as the LSD and other hallucinogens and is not a stimulant.

So the correct option is D.

Read the given statements and select the correct option. 
Statement 1 : Reforestation is the process of restoring a forest that once existed but was removed at some point of time in the past.
Statement 2 : Reforestation may occur naturally in a deforested area, however it can be speeded up by planting trees with due consideration to biodiversity that earlier existed in that area.

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

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.

Show answer
Correct Option: A
Explanation:

Reforestation is the natural or intentional restocking of existing forests and woodlands (forestation) that have been depleted, usually through deforestation. Reforestation can be used to rectify or improve the quality of human life by soaking up pollution and dust from the air, rebuild natural habitats and ecosystems, mitigate global warming since forests facilitate biosequestration of atmospheric carbon dioxide, and harvest for resources, particularly timber, but also non-timber forest products. Reforestation usually involves replanting areas of forest which have previously been damaged or destroyed, using native tree species. Sometimes forests are able to regenerate naturally if sufficient trees remain nearby and seeds can be dispersed into the deforested areas via animals or wind. However, areas of forest which have been severely degraded are unlikely to be able to regenerate naturally and need to be replanted by hand using native tree species.

So the correct option is 'both statements 1 and 2 are correct'.

The total percent of land in the world under forest area is

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

  1. 26%.

  2. 31%.

  3. 36%.

  4. 41%.

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Correct Option: B

Deforestation has an alarming effect on

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

  1. Increase in grazing area

  2. Sunlight

  3. Weed control

  4. Soil erosion or desertification of habitat

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Correct Option: D

Deforestation leads to

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  1. Soil erosion

  2. Global warming

  3. Soil protection

  4. Both A and B

Show answer
Correct Option: D
Explanation:

Deforestation is removal or deterioration of forest cover of an area. It results in shirking fuelwood, reduced timber, change in climate, soil erosion, flash floods, siltation, drought, loss of biodiversity, less rainfall, global warming etc.

Thus, the correct answer is option D.

What is the main cause for the extinction of some species in tropical forest?

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

  1. Deforestation

  2. Afforestation

  3. Pollution

  4. Soil erosion

Show answer
Correct Option: A
Explanation:
Deforestation is the depletion of forest resources. It's main cause is the explosion of human and livestock population with the increased demand requirements of the basic needs. The major effect of deforestation is the loss of precious wild life, rare species of flora and fauna. Directly or indirectly, deforestation caused intensified soil erosion, accentuated floods, drought and the worst pollution.
So, the correct answer is 'Deforestation'.

Forest destruction results in

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

  1. Loss of wild life

  2. Floods and drought

  3. Soil erosion

  4. All the above

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Correct Option: D
Explanation:

Forest destruction i.e. deforestation has many after effects, it leads to soil erosion, loss of habitat, etiction of wildlife, floods & drought conditions.

So, the correct option is 'All the above'.

Deforestation will decrease

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. Land slides

  3. Soil fertility

  4. Rainfall

Show answer
Correct Option: D
Explanation:

Deforestation is the process of extensive cutting of trees, which finally leads to the destruction of forests as the trees are removed in large numbers, the water cycle gets disturbed which results in decrease in rainfall

So, the correct answer is 'Rainfall'

Extensive planting of trees to increase forest cover is called

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

  1. Afforestation

  2. Agroforestry

  3. Deforestation

  4. Social forestry

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Correct Option: A
Explanation:

Afforestation is the process of planting a large number of trees for increasing forest cover, while deforestation is the process of cutting trees in large numbers from the forest.

So, the correct answer is 'Afforestation'

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. Global warming

  2. Drought

  3. Rainfall

  4. Soil erosion

Show answer
Correct Option: C
Explanation:

Deforestation means clearing or removal of forest by extensive cutting of trees, water cycle which goes on in the environment gets disturbed by lack of  sufficient number of trees. Trees increase the amount of rainfall due to transpiration, therefore if number of trees decrease rainfall also decreases, while other factors given in the options A, B & D increases.

So, the correct answer is 'Rainfall'