Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Which of the following is not the function of forest? 

  1. It is used to make paper.

  2. Resin, gum and drugs are obtained.

  3. Controls flood.

  4. Causes soil erosion.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Forests and trees make an essential contribution to food security by helping to maintain the environmental conditions needed for agricultural production. They stabilize the soil, prevent erosion, enhance the land's capacity to store water and moderate air and soil temperatures.

Therefore, the correct answer is option D.

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Soil erosion can be prevented by

  1. Terrace farming

  2. Intensive cropping

  3. Deforestation

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

Soil erosion can be prevented by:
(i) Intensive cropping means growing of more crops in the same fields and not leaving them unused. If the fields remain covered with crops throughout the year, top soil will not be exposed to winds or rains. Thus, no soil erosion will occur.
(ii) In hilly regions, small fields are formed in the form of steps or terraces for cultivation of crops. Such a farming in hilly regions Is called terrace farming. This technique reduces the flow of rain water down the slopes of hills. Moreover, eroded soil from upper regions of hills gets deposited in lower terraces. In this way, soil erosion can be prevented in hilly regions.
So, the correct answer is 'Both A and B'.

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Soil erosion is caused due to

  1. Strong winds

  2. Heavy rains

  3. Keeping the fields fallow for a long time

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

Causes of soil erosion are:
(i) Uncovered loose soil gets eroded when it is exposed to strong winds. The winds carry away the soil particles to other places,
(ii) When rain falls on the unprotected top soil, rain water washes it down into the streams and rivers etc.
(iii) Farmers loosen the top soil of the agricultural fields either for cultivation or for removing the weeds. Sometimes due to certain reasons, these agricultural fields remain fallow (not cultivated) for a long time. Top loosened soil of these agricultural fields, thus, becomes prone to erosion by winds or rains.
So, the correct answer is 'All of the above'.

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

The removal of land surface by water, wind or ice is known as

  1. Seepage

  2. Sewage

  3. Erosion

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

When the upper layer is displaced from one area to another, the process is called soil erosion. Erosion of land is a natural process. It starts with the displacement of soil particles under the influence of natural factors like water, wind or even ice. The forceful and rapid movement of all these leads to movement of soil along with it.

Seepage is the term used for percolation of water inside the soil. Sewage means drainage facilities.
So, option C "Erosion" is the correct option

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

More soil erosion occurs where there is

  1. No rainfall

  2. Low rainfall

  3. High rainfail

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Soil erosion is defined as the wearing away of topsoil. Topsoil is the top layer of soil and is the most fertile because it contains the most organic, nutrient-rich materials. Therefore, this is the layer that farmers want to protect for growing their crops and ranchers want to protect for growing grasses for their cattle to graze on.
Precipitation is the most forceful factor causing erosion.
Erosion is dependent on the amount, duration, intensity and frequency of rainfall. By the action of dashing rain drops on soil, soil granules are loosened, detached and separated into fine particles. Erosion is greater where the rainfall is not only heavy, but concentrated over short periods.
Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Which of the following phenomena take place when the top layer of soil is exposed?

  1. Soil erosion

  2. Infertile soil

  3. Both A and B

  4. Good quality new soil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If the top layer or soil is exposed, then it will gradually expose the lower layer of soil, which is hard and rocky in nature. This type of soil is less fertile as it contains less humus. Continued soil erosion will make the land barren or infertile.

Soil erosion is defined as the wearing away of topsoil. Topsoil is the top layer of soil and is the most fertile because it contains the most organic, nutrient-rich materials. Therefore, this is the layer that farmers want to protect for growing their crops and ranchers want to protect for growing grasses for their cattle to graze on.
In short, when top layer of soil is exposed, it results in soil erosion and infertile soil.

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Removal of top fertile layer of soil by wind or water is called as

  1. Leaching

  2. Erosion

  3. Siltation

  4. Weathering
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Soil erosion is the washing or blowing away (by wind or water) of the top layer of soil (dirt). This is a serious problem for farmers. Crops are the foods that farmers grow. If the soil has eroded, the crops will not grow very well.
Therefore, the correct answer is option B.