Soil Science - Study Mode
[#331] Most commonly found soil type
Correct Answer
(A) Alluvial
Explanation
Solution: The most commonly found soil type is Alluvial soil which is available all over our country along with the river sides. Alluvial soil is loose clay, silt, sand or gravel that has been deposited by running water in a stream bed. This soil is also called alluvial deposits, and these are highly fertile. Black soil is confined to central plateau regions as these are derivatives of trap lava. Laterite soil is commonly found in Southern states mostly.
[#332] Which ion can cause more water absorption?
Correct Answer
(B) Na +
Explanation
Solution: The sodium ion is the ion that can cause more water absorption in soils. Sodium ions have a strong ability to absorb water from their surroundings. Sodium ions are involved in the electrical neutralization of inorganic and organic anions and macromolecules, pH homeostasis, control of membrane electrical potential and the regulation of cell osmotic pressure.
[#333] Calcium, magnesium and sulphur are defined as
Correct Answer
(C) Secondary nutrients
Explanation
Solution: Calcium, Magnesium and Sulphur are known as secondary nutrients. There are 17 essential nutrient elements required by the plants for proper functioning and growth, which are further classified as micro and macro-nutrient or as primary and secondary nutrients. The primary nutrients without which the plants may not grow are NPK. (Nitrogen, Phosphorus and Potassium) whereas the secondary nutrients are required for specific functions in plants and these are calcium, magnesium and Sulphur.
[#334] Which one of the following microorganisms is responsible for maximum nutrient cycling in the soil?
Correct Answer
(A) Bacteria
Explanation
Solution: Bacteria are the microbe among the following microorganisms that are responsible for maximum nutrient cycling in the soil. A broad range of bacteria, archaea and fungi play a central and essential role in the biogeochemical cycling of soil nutrients. Microorganisms are responsible for the degradation of organic matter, which controls the release of plant nutrients, but is also important for the maintenance of soil structure and sustainability of soil quality for plant growth. A nutrient cycling in the soil is a repeated pathway of a particular nutrient or element from the environment through one or more organisms, like, as the carbon cycle, nitrogen cycle or phosphorus cycle.
[#335] Premature leaf fall is caused due to the deficiency of
Correct Answer
(C) Nitrogen
Explanation
Solution: The premature leaf fall is caused due to the deficiency of Nitrogen. Nitrogen is the most essential nutrient element required for the growth and development of plants. The deficiency of nitrogen causes the yellowing of green leaves, which ultimately causes the fall of the premature leaf. It also causes reduced in tiller development.