Tag: soil-nature

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Questions Related to soil-nature

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.




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

The Precambrian red rock indicates the ________________.

  1. Presence of the free oxygen

  2. Absence of free oxygen

  3. Presence of hydrogen

  4. Presence of water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The presence of red rocks (often banded iron formations) from the Precambrian era indicates oxidation of iron, which required the presence of free oxygen in the atmosphere.

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

The geological age of a rock is determined by.

  1. The fossil flora and fauna

  2. Chemical composition of the rocks

  3. Radiometric dating

  4. Spectroscopic data
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fossil flora and fauna are used in biostratigraphy to determine the relative geological age of sedimentary rock layers, as specific species existed only during certain time periods.

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

Humification results in the formation of ............. substance.

  1. Colloidal and Basic

  2. Acidic and Dark colored

  3. Amorphous and Light colored

  4. Light coloured colloidal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • Humification is a process in which organic material decomposes and breaks down. It results in the formation of humus. Humus is a dark-coloured, amorphous and acidic substance. 
  • It occurs in soils and peats. It improves the quality of soil by providing nutrient substances like nitrogen.

Thus, the correct answer is 'Acidic, Dark coloured.'

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

'X' is an organic substance obtained from the decomposition of plant or animals wastes which provides lots of humus to the soil. Identify the incorrect statements regarding decomposition.

  1. It makes the soil porous

  2. It reduces the water holding capacity of the soil

  3. it increase the number of friendly microbes

  4. It improves the texture of the soil
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Humus is the dark, organic material formed in the soil when plant and animal matter decays.
It is important as it retains-
1)  Moisture content in the soil.

2) Loosens the soil which allows better aeration and drainage.
3) It encourages the increase of soil organisms which help make nutrients available to plants. 
4) It makes the soil more porous.
5) High humus content increases water holding capacity of the soil.
So, the correct answer is 'It improves the texture of the soil'.