Tag: soil - formation, profile and properties

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Questions Related to soil - formation, profile and properties

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

Materials of biological origin which are commonly used to maintain and improve soil fertility are 

  1. green manures

  2. biofertilizers

  3. bioinsecticides

  4. both (a) and (b).
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Green manures are added to the soil to increase the productivity. Manures is of natural origin. The presence of nutrients in manure have a great role in increasing soil fertility. Biofertilizers are organisms which enrich the soil with nutrients e.g., Rhizobiumin symbiotic association with legume plants.

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

When large patches of forests are being cleared for cultivation of crops, the environmental impact of such a practice would lead to______

  1. Soil erosion

  2. Soil conservation

  3. Soil pollution

  4. Soil fertility
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Deforestation is a direct cause of the erosion happening in tropical rain forests. Once plant cover is gone there are no roots to hold the soil in place during heavy tropical rains, which then wash away the topsoil and the nutrients necessary to regenerate future vegetation.

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

The four main bases in a soil are

  1. Calcium, magnesium, sodium and potassium

  2. Vitamins A, B, C and D

  3. Nitrogen, Phosphorus, Iron and Potassium

  4. Magnesium, Vanadium and Iron and Aluminum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As rock becomes broken down through a variety of processes, such as weathering and erosion, the particles become ground smaller and smaller. The four main bases in a soil are Nitrogen, Phosphorus, Iron and Potassium.

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

The soil is a complex mixture of

  1. Soil biota

  2. Eroded rock

  3. Gases and water

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The soil is the mixture of minerals, organic matter, gases, liquids, and the countless organisms that together support life on Earth. 
  • The soil is a natural body known as the pedosphere and which performs four important functions. It is a medium for plant growth. 
  • It is a means of water storage, supply, and purification. 
  • It is a modifier of Earth's atmosphere. 
  • It is a habitat for organisms, all of which, in turn, modify the soil.
So the correct answer is 'All of the above'.
Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

What is a soil horizon?

  1. A factor influencing how soil is formed

  2. A layer of soil

  3. An organism found within the soil

  4. A technique used to map soils
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Explanation: Virtually all soil profiles are composed of a number of distinctive layers, termed horizons, interpretation of which is the key to understanding how the soil has formed.