Tag: soil- our life

Quizzes (9) Questions (63)

Questions Related to soil- our life

Multiple choice evs soil- our life horizons of soil soil - formation and profile soil-nature

Soil building begins with the physical fragmentation of

  1. Lichens

  2. Humus

  3. Aggregate

  4. Parent material
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The development of a soil would begin with the weathering of lava flow bedrock, which would produce the purely mineral-based parent material from which the soil texture forms. Soil development would proceed most rapidly from bare rock of recent flows in a warm climate, under heavy and frequent rainfall. This The mineral material from which a soil forms is called parent material. Rock, whether its origin is igneous, sedimentary, or metamorphic, is the source of all soil mineral materials and the origin of all plant nutrients with the exceptions of nitrogen, hydrogen and carbon. As the parent material is chemically and physically weathered, transported, deposited and precipitated, it is transformed into a soil.
So, the correct answer is 'Parent material'.
Multiple choice evs soil- our life horizons of soil soil - formation and profile soil-nature

The study of the vertical section of the layers of the soil is known as 

  1. Soil study

  2. Soil profile

  3. Soil layering

  4. Soil weathering
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A soil profile consists of multiple horizontal layers of soil called horizons. Horizons occur parallel to each other. Each horizon is distinct from the other with respect to age, texture, color etc, these horizons can be observed when the soil layers are dug through vertically
So, the correct answer is 'Soil profile'
Multiple choice evs soil- our life horizons of soil soil - formation and profile soil-nature

Weathering is the process of

  1. Formation of rock

  2. Formation of soil

  3. Formation of humus

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

Weathering is the breakdown of rocks, minerals, and soils through contact with the atmosphere, water, and biological organisms, which is the first step in soil formation.

Multiple choice evs soil- our life horizons of soil soil - formation and profile soil-nature

The layer of humus in the soil profile is observed at

  1. The lowermost layer of the soil

  2. The topmost layer of the soil

  3. The soil layer beneath the clay

  4. The soil layer above the sand
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Humus is formed from decaying organic matter (leaves, twigs, etc.) that accumulates on the surface of the ground.

Multiple choice evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

Water holding capacity of the soil depends upon 

  1. Chemical composition of soil

  2. Particle size of soil

  3. Aggregation of soil particle

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

The quantity of water soil can retain after flowing down of the gravitational water is called its filled capacity or water holding capacity. Its depends on chemical composition of the sol which means types of ions present and hence pH of the soil . Size of sol particles and their aggregation form pores in soil. Large pores take part in percolation of water in the soil but small pores hold water by capillarity. 

So, the correct answer is 'All of the above'.

Multiple choice evs soil : our life soil profile soil- our life soil and crops

Which of the following are the substances that are present in the soil and required for the growth of crops?

  1. Manures

  2. Pesticides

  3. Fertilisers

  4. Nutrients
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We know that the growth of plants in the soil requires the presence of certain substances in it. This includes water and also nutrients present inside the soil.

Manures, as we know are prepared naturally by the process of decomposition of plant and animal bodies in the soi. They are not present in the soil but have to be prepared by composting and then added to the crop soil.
Pesticides are chemical substances that sprayed on the crop plants artificially to protect them from insect pests.
Fertilizers are also chemically prepared substances added to the soil to improves its nutritive value.
So, option D "Nutrients' is the correct answer.





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