Tag: soil profile

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Questions Related to soil profile

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

Humus is an example of

  1. Crystalloids

  2. Organic colloids

  3. Soil structure

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

There are four major types of colloids present in soil :

1. Layer silicate clays 
2. Iron and aluminum oxide clays (sesquioxide clays) 
3. Allophane and associated amorphous clays 
4. Humus. 
Layer silicate clays, iron and aluminum oxide clays, allophane and associated amorphous clays are inorganic colloids while humus is an organic colloid.
Therefore, the correct answer is option B. 

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

Pure clay is not suitable for plant growth because

  1. It is chemically inert

  2. It is chemically active

  3. It forms a solid non penetrable mass

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

Clay soil is soil that contains a high percentage of clay particles. It is slow to drain water and quick to harden leading to water logging. It blocks root absorption, which prevents plants from getting nutrients required for survival. Hence it is not suitable for plant growth. Thus the correct answer is option C.

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

Good soil is

  1. Which allows the limited amount of water into it

  2. Which allows to percolate the water slowly from it

  3. Which allows to pass water very quickly from it

  4. Which holds whole of water into it
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A good soil needs to be deep, fine-textured, moist, free-draining, loamy, and have an organic-rich topsoil. These properties best enable plant roots to take up nutrients, water and oxygen, and get enough support for rapid growth. In clay soils with small pore spaces, water moves slowly and spreads outward from where it is applied due to capillary action. In sandy soil, irrigation water can penetrate to 72 inches below the surface within 24 hours of application. In soils with a heavy clay content, water only penetrates to roughly 36 inches in 24 hours.

Therefore, the correct answer is option B.

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

Why is organic matter (humus) an important part of soil?

  1. It helps to improve water infiltration

  2. It can break down organic pollutants

  3. It converts nitrogen in the air into nitrates used by plants

  4. It is rich in nutrients, which is important for fertility
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Humus controls and regulates many soil functions, as well as plant growth. The better the humus count in the soil, the healthier and more productive soil will be. Regardless of the program one uses in farming operations, the higher the humus count, the better the crop is grown yield. Good humus count in the soil will hold soil moisture longer, thus less water is required for crop production. Also, good humus count reduces both water and wind erosion of soil.

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

The soil near the surface is usually darker than about one meter down, this is because the top soil


  1. Is richer in Ca and Mg

  2. Contains more organic matter

  3. Is wetter than the sub soil

  4. Is drier than the sub soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

(b) Top soil contains decomposed and amorphous organic matter composing of sand with humus.

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

Humus is defined as

  1. Physical texture of soil

  2. Chemical composition of soil

  3. Decomposed organic matter in soil

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

Humus is the dark, organic material that forms in soil when plant and animal matter decays. It is a crucial component for soil fertility.

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

Precious stones, such as gem stones, are products of

  1. Volcanic rocks

  2. Sedimentary rocks

  3. Metamorphic racks

  4. Igneous rocks
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • A gemstone, also known as the precious stone, jewel, a gem is a piece of mineral crystal which is cut and polished and it is used to make jewellery or other accessories. Gemstones are formed from igneous rocks. Interlocking crystals grow within intrusive igneous rock and may form gemstones depending on elements present, cooling time and the environment.
  • Hence precious stones, such as gemstones, are products of igneous rocks.
  • So, the correct answer is 'Igneous rocks'.
Multiple choice evs mud and stones soil - formation and profile soil-nature soil profile

Column I represent the size of the soil particles and Column II
represents type of solid components. Which of the following is
correct match for the Column I and Column II.

Column I Column II
A. 0.2 to 2.00mm (i) Slit
B. Less than 0.002 mm (ii) Clay
C. 0.02 to 0.2 mm (iii) Coarse and particle
D. 0.002 to 0.02 mm (iv) Fine sand particle



  1. (A) - (ii), (B) - (iii), (C) - (iv), (D) - (i)

  2. (A) - (iv), (B) - (i), (C) - (iii) , (D) - (ii)

  3. (A) - (iii) , (B) - (ii) , (C)-(iv), (D) - (i)

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

The texture of soil is determined by the proportions of particles of different sizes. Coarse sand particles are of 0.2 to 2.00 mm in size; 0.02 to 0.2 mm particles constitute fine sand; 0.002 to 0.02 particles represent silt and particles smaller than 0.002 mm are called clay.