Tag: evs - i

Questions Related to evs - i

Desertification is a type of

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

  1. food preparation method for plants

  2. afforestation method

  3. land degradation

  4. None of these

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Correct Option: C
Explanation:

Desertification is a type of land degradation in which relatively dry area of land becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife.

The hard mineral crust formed at or near the surface of soil is known as

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

  1. Duripan.

  2. Duricrust.

  3. Anaerobic soil.

  4. Peat.

Show answer
Correct Option: B

............ is a man-made source of air pollution.

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

  1. Desert

  2. Farming

  3. Dust storms

  4. Volcanic eruptions

Show answer
Correct Option: B
Explanation:

Farming is considered as the major source of air pollution due to man. This is the man-made source of air pollution which allows the particles to enter the atmosphere. The movement of tractors will cause the soil particles to rise up in the air. The particles from the fertilizers and pesticides spray enter the atmosphere. Also during harvesting and husking, the small particles in the form of pollens and husks can result in air pollution. 

Thus, the correct answer is option B. 

Which  one of the following is not a reason for shortage of usable water?

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

  1. Over exploitation

  2. Climate change

  3. Deforestation

  4. Decrease in sea level

Show answer
Correct Option: D
Explanation:

Overuse of the water resources will result in the exhaustion of the water supply. The climatic change has resulted in global warming and seasonal variations. There is a decrease in the annual rainfall which was received by a region due to shortening of the seasons. Deforestation has resulted in a decrease in the number of trees which thereby affect the amount of rainfall which was received. There is soil erosion which results in water run off.The decrease in the level of the sea is not a reason for the shortage of usable water. 

Thus, the correct answer is option D. 

Deforestation may reduce the chances of

evs - i rules are for everyone damaging the forests deforestation and afforestation protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles pollution of soil degradation of land

  1. Rainfall

  2. Frequent cyclones

  3. Erosion of surface soil

  4. Frequent land slides

Show answer
Correct Option: A
Explanation:

Deforestation is the process of cutting or removal of forest to fulfill the need of the population. It has many negative impacts on the environment such as loss of species, soil erosion and reduces rainfall. The tree absorbs water from soil for photosynthesis and produces water vapor that is released into the atmosphere which in turn causes rainfall. If there will be less number of the tree then rainfall will also decrease. Thus, the correct answer is option A.

If we remove half of the forest cover of earth, what kind of crisis will occur?

evs - i rules are for everyone damaging the forests deforestation and afforestation protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles pollution of soil degradation of land

  1. Many species would become extinct.

  2. Population, pollution and ecological imbalance will rise.

  3. Energy crisis will commence.

  4. The remaining forest will cause imbalance.

Show answer
Correct Option: B
Explanation:

Forests occupy more than 30 percent of Earth's land surface and account for 50 percent of plant productivity. Therefore 45% of the carbon stored on land is tied up in forests. Further, these being the dominant terrestrial ecosystem, the forest account for 75% of the gross primary productivity of the Earth's biosphere and 80% of the plant biomass. Removing half the forest cover, will not only bring in an increase in the population of human beings and other living organisms but will also bring about increased pollution and a great ecological imbalance.

Recurrence of floods in the plains of North India is due to excessive

evs - i rules are for everyone damaging the forests deforestation and afforestation protecting our environment sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles pollution of soil degradation of land

  1. Siltation of dams

  2. Rainfall

  3. Agriculture

  4. Deforestation in catchment area

Show answer
Correct Option: D
Explanation:

Floods are common in north India because of excessive deforestation in the catchment areas. Roots of the trees keep the soil together and drain the extra water into the underground water reservoir. Due to deforestation (cutting down of the trees), the soil is no longer able to hold or drain the excess water thus leading to floods. 

In 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 darns has gone up

  3. There has been increased deforestation in the catchment areas

  4. Increased areas of land is being self cultivated

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Correct Option: C

Deforestation is the major causal agent of

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

  1. Depletion of natural resources

  2. Environmental pollution

  3. Desertification of habitat

  4. Genetic erosion

Show answer
Correct Option: C
Explanation:
Deforestation leads to erosion of top fertile layer of the soil, it also depletes the soil of decomposing microorganisms and thus humus. Absence of humus makes the soil dry i.e, its water holding capacity is decreases. So no vegetation grows in the soil, further depleting the condition of the soil leading to desert like condition. Hence, also called desertification
So, the correct answer is 'Desertification of habitat'

Which one is not a natural factor for causing soil erosion?

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

  1. Gullying

  2. Clips

  3. Rilling

  4. Deforestation

Show answer
Correct Option: D
Explanation:

Soil erosion is the process of weathering of top layer of soil either due to natural factor or artificial factor. The natural factors are called as erosion agents. These include water, wind, ice. Water produces 4 types of erosion, namely splash erosion, sheet erosion, rill erosion, and gully erosion. Gully erosion occurs due to drainage of soil by surface water runoff. Rilling erosion is the erosion due to concentrated water running through little streamlets. Deforestation is the artificial or man-made factor for causing soil erosion.

Thus, the correct answer is 'Deforestation.'