Tag: soil profile

Questions Related to soil profile

Which of the following statements will not hold true if a plant is grown in only sand (S), only clay (C) and only humus (H)?

evs mud and stones soil - formation and profile soil-nature soil profile

  1. Water availability to the roots will be more in (C) and (H) as compared to (S).

  2. Ability of roots to penetrate (S) and (H) will be low as compared to (C).

  3. Nutrient availability to roots will be less in (S) as compared to (C) and (H).

  4. Oxygen availability to roots will be low in (C) as compared to (S) and (H).

Show answer
Correct Option: B
Explanation:

All statements are true except the ability of roots to penetrate in sand and hummus are low as compared to clay.

So, the correct option is 'Ability of roots to penetrate (S) and (H) will be low as compared to (C).'.

In addition to the rock particles, the soil contains

evs mud and stones soil - formation and profile soil-nature soil profile

  1. Air and water

  2. Water and plants

  3. Minerals, organic matter, air and water

  4. Water, air and plants

Show answer
Correct Option: C
Explanation:
  • Soil composition refers to the nutrients and various other substances present in the soil. 
  • The basic components of soil are minerals, organic matter, water, and air. The typical soil consists of approximately 45% mineral, 5% organic matter, 20-30% water, and 20-30% air.
  • Hence In addition to the rock particles, the soil contains Minerals, organic matter, air, and water.
  • So, the correct answer is 'Minerals, organic matter, air, and water'.

The process of mineralisation by microorganisms helps in the release of

evs mud and stones soil - formation and profile soil-nature soil profile

  1. Inorganic nutrients from humus

  2. Both organic and inorganic nutrients from detritus

  3. Organic nutrients from humus

  4. Inorganic nutrients from detritus and formation of humus

Show answer
Correct Option: A
Explanation:

Mineralization is the release of inorganic substances, both non-mineral(e.g., CO2, H2O) and mineral(e.g., Ca2+, Mg2+, K+, NH+4) from organic matter. The process is slow because of trapping of these nutrients in humus and their immobilization in decomposers/detritivores. It prevents their washing out or leaching. Nutrients immobilized in decomposer microbes and detritivores are again exposed to humification and mineralization after the death of these organisms.

So, the correct answer is 'Inorganic nutrients from humus'.

Soil is composed of

biology natural resources - air, water and land soil - formation and profile soil-nature soil profile

  1. Mineral + Water + Air

  2. Mineral + Organic matter + Air

  3. Mineral + Organic matter + Air + Water

  4. Organic matter + Water

Show answer
Correct Option: C

Which of the following soils cracks and shrinks most as it dries? 

biology natural resources - air, water and land soil - formation and profile soil-nature soil profile

  1. Porous soil

  2. Clay soil

  3. Loam soil

  4. Sandy soil

Show answer
Correct Option: B

Deep black soil is considered to be highly productive due to high proportion of

biology natural resources - air, water and land soil - formation and profile soil-nature soil profile

  1. Silt and earthworm

  2. Clay and humus

  3. Gravel and $Ca^{++}$

  4. Sand and Zn

Show answer
Correct Option: B

........ can be defined as the organic and inorganic materials on the surface of the Earth that provides the medium for plant growth.

evs mud and stones soil - formation and profile soil-nature soil profile

  1. Humus

  2. Soil

  3. Minerals

  4. Ores

Show answer
Correct Option: B

The top most layer of soil contains

biology natural resources - air, water and land soil - formation and profile soil-nature soil profile

  1. Humus, living organism and soil

  2. Human, living organism and plants

  3. Humans and soil particles

  4. Human and microorganism

Show answer
Correct Option: A
Explanation:

The top most layer of soil is said to contain and support a lot of living organisms. It also has organic manure in it that supports the growth and development of plants. 

So, option a "Humus, living organisms and soil" is the correct answer.

Soil contain rock particles

biology natural resources - air, water and land soil - formation and profile soil-nature soil profile

  1. Water and plants

  2. Minerals, organic matter, air and water

  3. Air and plants

  4. Air, water and plants

Show answer
Correct Option: B
Explanation:

The soil is formed by weathering of rocks. It contains an organic material (dead decay of leaves and plants) called humus, which makes soil fertile, and mineral by the breakdown of rocks. It also contains soil and water. Thus, the correct option is B.

Identify the constituents of soil.

evs mud and stones soil - formation and profile soil-nature soil profile

  1. Gravel

  2. Salt

  3. Mineral

  4. All of the above

Show answer
Correct Option: D
Explanation:
Soil is a major part of the natural environment, alongside air and water, and is vital to the existence of life on the planet. Soil is the result of the process of the gradual breakdown of rock, the solid geology that makes up the Earth. As rock becomes broken down through a variety of processes, such as weathering and erosion, the particles become ground smaller and smaller.
As a whole, soil is made up from four constituents: mineral material, organic material, air and water. There are considered to be three main mineral parts to soil; ‘sand’, ‘silt’ and ‘clay’. These parts give the soil its 'mineral texture'. In addition, as leaves and other organic material fall to the ground and decompose - there also forms an ‘organic’ layer. Soil scientists (or pedologists) use a series of sieves info to separate out the constituent parts in order to characterise soil by texture class.