Tag: protecting our environment

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Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

Soil erosion can be prevented by 

  1. Overgrazing

  2. Removal of vegetation

  3. Afforestation

  4. Deforestation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Afforestation is the establishment of a forest or trees in an area where there was no forest. As the roots of trees spread deep into the layers of soil, they hold it tightly, thus preventing soil erosion. 

Therefore, the correct answer is option C.

Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

Soil conservation is

  1. Aeration of soil

  2. Erosion of soil

  3. Protection of soil against loss

  4. Conversion of sterile soil into fertile soil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Soil conservation is the prevention of soil from erosion or reduced fertility caused by overuse, acidification, salinization or other chemical soil contamination. Slash-and-burn and other unsustainable methods of subsistence farming are practiced in some lesser developed areas.
Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

Terracing is an effective method of soil conservation in

  1. Desert areas

  2. Plain areas

  3. Hill areas

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Terracing is a soil conservation practice applied to prevent rainfall run-off on sloping land from accumulating and causing serious erosion. Terraces consist of ridges and channels constructed across-the-slope. The major benefit is the conservation of soil and water. Terraces reduce both the amount and velocity of water moving across the soil surface, which greatly reduces soil erosion. Terracing thus, permits more intensive cropping than would otherwise be possible
So, the correct answer is 'Hill areas'
Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

Forests

  1. Maintain natural balance

  2. Control atmospheric pollution

  3. Prevent soil erosion

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Forests are essential to life on Earth. Without them, the energy of the sun would not be harnessed through the process of photosynthesis, nor would oxygen be released through the same process. Aside from these two vital ingredients to life, they are also important in that they are home to countless species of plants and animals, many of which are endangered. Though tropical forests cover only 7% of the Earth's land mass, they are home to more than 50% of the world's 10-50 million plant and animal species. Often, the plants in the forests also provide us with medicines. On a more basic level, they have provided the human race with wood for centuries, without which people would not be living at the level of comfort they have today.
Having a few trees around homes can cut heating and cooling energy costs in half! Also, with increased levels of contamination of groundwater by chemicals, it is important to note that the thin hair-like root fibers of trees helps in filtering the water. The leaves also act as natural filters of air and water by removing particulate matter. A very important function of trees in the growing concrete-based world is in flood control. The roots hold soil in place, which would otherwise be washed away in heavy rains. Trees also act as natural barriers to the weather elements such as wind and snow. In effect, they are nature's method of climate control.
On a more social level, trees are important to people since they are very aesthetically pleasing -- they provide the scenery which helps relax people. As such, they are a valuable resource for recreation, which in turn contributes to local and national economic growth by providing more jobs.
Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

Soil erosion can be prevented by

  1. Increase in bird population

  2. Afforestation

  3. Over-grazing

  4. Removal of vegetation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Afforestation is the planting of vegetation. The vegetative cover protects the soil from the beating and dispersing action of the raindrops by forming a canopy over the soil surface. Vegetation also acts as a mechanical obstruction to flowing water, thus reducing its erosive potential. The plant roots help in building a better structure. They said in opening the soil and thereby accelerating water absorption and reducing surface run-off.
All other factors given in the options will promote soil erosion.
Therefore, the correct answer is option B.
Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment
Tree hugging movement is associated with the protection of

  1. Land

  2. Water bodies

  3. Forests

  4. Wildlife
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tree hugging movement also known by the name of chipko movement is forest conservation movement of India which came forward when the forest cover started deteriorating at an alarming rate then soon villagers, especially women, began to organize themselves under several smaller groups and resorted to hugging the trees to stop them from being felled.

So, the correct answer is option C.

Multiple choice evs - i the environment and us soil and its conservations soil pollution-control protecting our environment

Which of the following kills the organisms in the soil?

  1. Metallic substances

  2. Earthern pots

  3. Polythene bags and plastics

  4. Glass ware
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As a result of various activities of mankind, our environment is getting increasingly polluted. pollutants are of 2 types: Biodegradable and non-bio degradable

Biodegradable pollutants are the ones which decompose after some time but non-bio degradable pollutants are the ones which don't degrade easily. 
Plastics are non-bio degradable wastes. They remain intact until a long period of time. it takes thousands of years for plastic to get rid of its toxic substances and break down. Thus, their toxic chemicals cause harm to the plants. Apart from this, if any plastic material or polythene bag is eaten by animals, they eat the toxic substance present in them and thus catch deadly diseases. 
Thus, Plastics and polythene bags are extremely harmful to the environment.
So, option C ' Polythene bags and plastics' is the correct option.





Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

Select the wrong statement

  1. Forests provide variety of products.

  2. Forests have greater plant diversity.

  3. Forests do not conserve soil.

  4. Forests conserve water.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Forests conserve and enhance the soils ability to sustain diverse ecosystems. They conserve the productive capacity of the land by reducing soil and nutrient loss. Forests also restrict soil and nutrient loss by reducing the volume of rain falling to the ground. The forest canopy absorbs much of the kinetic energy of rain, reducing its ability to loosen and displace soil particles and cause surface runoff. 

Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

All the following are proper plans for increasing agricultural production except

  1. Expansion of irrigation facilitles

  2. Increase in application of fertilizers

  3. Mechanisation of various aspects offarming

  4. Cutting of forests to add land for cultivation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cutting of forests also called as deforestation that can provide additional area for cultivation. However, this is an incorrect plan because it leads to decrease in the number of trees. This will in turn lower rainfall and hence decrease the agricultural production. Thus the correct answer is option D.

Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

The check-dams stop the rainwater from ______

  1. Flowing away

  2. Reduce soil erosion

  3. Above both options

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

Check-dams are built to slow down the flow of water, which helps in both water conservation (preventing it from flowing away) and reducing soil erosion by decreasing the velocity of runoff.