Agronomy - Study Mode
[#301] The strongest chemical agent for breaking dormancy is
Correct Answer
(A) Potassium nitrate
Explanation
Solution: Dormancy is a strategical condition of higher plants to survive adverse conditions by pausing growth and development, and it can occur in any organ like seeds or buds, etc. It can be controlled both by genetic and environmental factors. While Potassium nitrate is the strongest chemical used for breaking dormancy.
[#302] A place where money is coined
Correct Answer
(A) Mint
Explanation
Solution: A mint is a name of an industry that manufactures coins that can be used as currency. The first mint was established in Lydia in the 7 th century BC for coining gold, silver and electrum.
[#303] Khaira disease is associated with
Correct Answer
(B) Paddy
Explanation
Solution: Khaira disease is associated with paddy. It is a micro nutritional deficiency disease characterized by the presence of dusty brown patches on leaves which ultimately undergo necrosis. It affects the leaf of the plant because of which the rate of photosynthesis is decreased ultimately affecting the production. The essential nutrient responsible for khaira disease in rice is Zinc.
[#304] Which one of the following increases phosphate solubility
Correct Answer
(B) Pseudomonas
Explanation
Solution: PSM i.e. Phosphate solubilizing microbes are a group of beneficial microbes present in organic matter of soil that makes insoluble phosphate available to plants by mineralization process, they make it soluble which is then easily absorbed and assimilated by plants. Pseudomonas aeruginosa was reported first time as a promising phosphate solubilizer and biofertilizer.
[#305] A calibrated device for measuring the flow of water in open channel is known as
Correct Answer
(B) Parshall flume
Explanation
Solution: Parshall flume is an open channel flow metering device that was developed to measure the flow of surface waters and irrigation flows. It is a fixed hydraulic structure. It is used to measure volumetric flow rate in industrial discharges, municipal sewer lines, and influent/effluent flows in treatment plants also.