Soil Science - Study Mode
[#791] Most of the plants obtain nitrogen from soil in the form of
Correct Answer
(B) Nitrate
Explanation
Solution: Most plants obtain nitrogen from the soil in the form of Nitrate. Nitrate is the form of nitrogen most used by plants for growth and development. Nitrates in the soil are a primary source of nitrogen which is essential for plant growth. Under normal conditions, nitrates are converted to protein in the plant at about the same rates as they are absorbed into the root system.
[#792] Zoning is used for differentiating isomorphous minerals, ex.
Correct Answer
(B) Albite & anorthite
Explanation
Solution: Zoning is used for differentiating isomorphous minerals, ex. Albite & anorthite. Zoning is a scientific concept and refers to the segregation of a vast mass of land such as that of a city or a township into several zones. This is done to facilitate the proper use of land for a different purpose. Isomorphous minerals contain different elements arranged in the same arrangement and number.
[#793] CAN is a/an
Correct Answer
(C) Both A and B
Explanation
Solution: CAN is a nitrogen fertilizer that contains equal parts of fast-acting nitrate-nitrogen and longer-lasting ammonium-nitrogen. Fertilizer grade CAN contain roughly 8% calcium and 21 - 27% nitrogen. CAN is both Nitrate as well as ammonium fertilizer. It is preferred for use on acid soils.
[#794] VAMA is a
Correct Answer
(A) Polyanionic soil conditioner
Explanation
Solution: Soil conditioners also referred to as soil amendments, help improve soil structure by increasing aeration, water holding capacity and nutrients. They help break up compacted clay soils, which lack sufficient space for air and water, both of which are important for microorganisms to thrive and for plant roots to grow. VAMA is a polyanionic soil conditioner.
[#795] PLFA is used to measure
Correct Answer
(A) Biodiversity
Explanation
Solution: PLFA is Phospholipid fatty acid analysis is used for estimation of microbial biomass and community composition, especially in sediments and soils but also to characterize bacterial communities in water. Phospholipids can occur in many biological classes such as in plant roots, fungi, as well as in soil bacteria. A sampling of agricultural soils for analysis of chemical composition has long been practiced in crop production and while there has been recognition of the importance of the soil microbial.