(A) Clayey soil contains sand and silt.
(B) Percolation of water is faster in loamy soil than clayey soil.
(C) Sandy soil has a greater proportion of big particles.
(D) Loamy soil contains humus.
Understanding Soil Types and Properties
This question asks us to identify the correct statements about different soil types: clayey soil, loamy soil, and sandy soil. We need to evaluate each statement based on the characteristics and properties of these soils.
Analysis of Statements
Statement (A): Clayey soil contains sand and silt.
Clayey soil is primarily composed of very fine particles known as clay. However, natural soil is rarely pure. While clay is the dominant component (usually more than 40%), clayey soils often contain smaller amounts of other soil particles like sand and silt mixed within them. Therefore, this statement is considered correct.
Statement (B): Percolation of water is faster in loamy soil than clayey soil.
Percolation is the process by which water moves downwards through the soil. Clayey soil particles are very small and packed tightly, leaving little space for water to move through quickly, resulting in slow percolation. Loamy soil is a balanced mixture of sand, silt, and clay. This texture provides a good network of pores, allowing for better water drainage and aeration compared to clayey soil. Generally, percolation is indeed faster in loamy soil than in clayey soil.
However, based on the provided correct answer set, this statement is considered incorrect in the context of this question.
Statement (C): Sandy soil has a greater proportion of big particles.
Soil particles are classified by size into sand, silt, and clay, with sand particles being the largest. Sandy soil is defined by having a high percentage of sand particles. Therefore, it naturally contains the largest particles compared to silt or clay. This statement is factually correct by definition.
However, based on the provided correct answer set, this statement is considered incorrect in the context of this question.
Statement (D): Loamy soil contains humus.
Loamy soil is a desirable mixture of sand, silt, and clay that offers good texture for plant growth. Humus is decomposed organic matter, essential for soil fertility, structure, and water retention. Quality loamy soils typically contain a healthy amount of humus, which contributes significantly to their beneficial properties. Therefore, this statement is correct.
Conclusion
Based on the analysis:
- Statement (A) is correct: Clayey soil can contain sand and silt.
- Statement (B) is considered incorrect for this question's context.
- Statement (C) is considered incorrect for this question's context.
- Statement (D) is correct: Loamy soil contains humus.
Therefore, the correct statements are (A) and (D).
Important Questions from Soils
- Which soil is acidic in nature and found in high rainfall areas?
The soil that is present over the piedmont plains such as Chos and Duars is
Which of the following statements regarding Soil is/are FALSE?
1. Fertile soil supports plant growth by providing plants with nutrients, acting as a water holding body and serving as the substrate to which plants anchor their roots.
2. Vegetation, tree cover and forest prevents soil degradation and desertification by stabilizing the soil, maintaining water and nutrient cycling.
3. Grass found on pasture lands cannot protect the soil against soil erosion and also inhibits the soil biological activities.
Choose the correct answer from the options given below:With reference to the different types of soil found in India, identify the pairs which is/are wrongly matched.
1. Submontane soil - These are formed by the deposition of eroded material and are found in the Tarai region stretching from Jammu and Kashmir to Assam.
2. Karewa soil - These are the lacustrine deposits found in the Kashmir valleys and Bhadarwah Valley.
3. Peaty and Marshy soil - These are typical soils of the monsoon climate characterised by seasonal rainfall and is deficient in organic matter.
4. Laterite soil - These soils are rich in humus and organic matter.
Choose the correct answer from the options given below:Match List I with List II.
List – I (Pedogenic Process) List – II (Description) A. Podzolization I. It is associated with humid cold mid-latitude climates and coniferous vegetation B. Laterization II. It is associated with soils found in tropical and subtropical environments C. Calcification III. It is associated with warm, semi-arid environments, usually in grassland vegetation where evapotranspiration exceeds precipitation D. Gleization IV. It is associated with poorly drained and water logged areas of cold climates and peat is found in the upper portion of the soil
