Soil Science - Study Mode

[#456] Efficiency of urea can be increased by
Correct Answer

(B) Using neem cake

Explanation

Solution: Urea is an organic compound and more than 90% of world industrial production of urea is destined for use as a nitrogen-release fertilizer. Urea breaks down in the soil to give ammonium. The efficiency of urea can be increased by using neem cake with it, as it reduces the rate of nitrification thus efficiency is increased.

[#457] Match the following columns: Column I (Rhizobium sp.) Column II (Crops) a. R. lupini 1. Lupine group b. R. trifoli 2. Clover group c. R. japonicum 3. Soybean d. R. meliloti 4. Alfa-alfa
Correct Answer

(D) a-1, b-2, c-3, d-4

Explanation

Solution: Rhizobium lupini belongs to the Lupine group of crops as this was isolated from lupine nodules. Lupine is the genus of 200 species of herbaceous and woody plants. Rhizobium trifoli belongs to Trifolium (clover) group of crops. It is the microsymbiont of Trifolium species, which are valuable agricultural forage legumes. Rhizobium japonicum is a species of legumes-root nodulating, microsymbiotic nitrogen-fixing bacteria. It is associated with soybean species. Rhizobium meliloti is found in association with alfa alfa crop plantation. These are aerobic, gram-negative, and diazotrophic species of bacteria. It fixes atmospheric nitrogen into ammonia for their legume symbionts, such as alfa-alfa.

[#458] Urea contains . . . . . . . . nitrogen
Correct Answer

(C) 46%

Explanation

Solution: Urea is a source of nitrogen, an essential nutrient crucial for crop growth and development. It is a widely used nitrogenous fertilizer because of its high N content is 46%. It contains 46% nitrogen. It is the most widely used fertilizer in the country and is good for crop growth and development.

[#459] Effective particle diameter for Ion exchange is
Correct Answer

(B) < 20μ

Explanation

Solution: The effective particle diameter for Ion exchange is < 20μ. Ion exchange is a reversible chemical reaction wherein an ion (an atom or a molecule that has lost or gained an electron and thus acquired an electrical charge) from a wastewater solution is exchanged for a similarly charged ion attached to an immobile solid particle.

[#460] Amino acids produced during Photorespiration is
Correct Answer

(A) Glycine

Explanation

Solution: Photorespiration is a respiratory process in many higher plants by which they take up oxygen in the light and give out some carbon dioxide, contrary to the general pattern of photosynthesis. In photorespiration, peroxisomal glutamate: glyoxylate aminotransferase (GGAT) catalyzes the reaction of glutamate and glyoxylate to produce 2-oxoglutarate and glycine. Amino acids produced during photo respiration are Glycine.