Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

The RQ of sprouting potato is 1.
An RQ value of 1 indicates that carbohydrates were the main source of energy utilization.
The RQ respiratory quotient, also known as the respiratory ratio (RQ), is defined as the volume of carbon dioxide released over the volume of oxygen absorbed during respiration. It is a dimensionless number used in a calculation for basal metabolic rate when estimated from carbon dioxide production to oxygen absorption.

Boron is injurious to plants when irrigational water contains > 3 ppm concentration of boron.
The range between deficiency and toxicity of boron for many crops is narrow. To sustain an adequate supply of boron to the plant at least 0.02 ppm of boron in the irrigation water may be required, the maximum value should be less than 3 ppm.
The B concentration in the irrigation water (0.1 and 0.5 mg/L) was chosen to avoid acute toxicity and to reveal the effects of B in physiologically healthy plants. These concentrations are below the B threshold values for irrigation water in most countries.

The maximum concentration limit of urea for spraying is 4%.
Urea is the most important nitrogenous fertilizer in the country because of its high N content (46%), which is required for the growth and development of the crop.
The maximum concentration limit of urea for spraying is 4%. Concentration should always be kept in mind before spraying any insecticide or fertilizer as excess may harm to an extreme extent the crops.

The enzyme required in early CO₂ fixation in the C₄ cycle is PEP carboxylase.
PEP carboxylase, which is located in the mesophyll cells, is an essential enzyme in C₄ plants.
It is an enzyme in the family of carboxy-lyases found in plants and some bacteria that catalyzes the addition of bicarbonate (HCO₃^-) to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate and inorganic phosphate.

686000 cal usable energy is available during oxidative combustion of 1 gm molecule of glucose in the body.
Combustion involves a complete oxidation reaction where biomass reacts with excess oxygen at high temperatures (700 - 1400°C) to generate heat in the form of steam and other gaseous by-products such as carbon dioxide (CO₂) and water (H₂O).
Complete oxidation of one molecule of glucose results in the production of the equivalent of 38 molecules of ATP. 1 gram of glucose molecule yields 686 kcal, which is equivalent to 686000 calories of energy.

CAN is calcium ammonium nitrate, also known as nitro-limestone or nitrochalk, and is a widely used inorganic fertilizer. It contains about 25% of nitrogen.
Anhydrous ammonia is an efficient and widely used source of nitrogen fertilizer and its nitrogen content is 82%.
Urea is the most important nitrogenous fertilizer in the country because of its high N content and which is 46%.
Ammonium nitrate is a commonly used nitrogenous fertilizer and its nitrogen content is 33%.

Carboxin is the 1^st systemic fungicide.
Carboxin is an anilide obtained by formal condensation of the amino group of aniline with the carboxy group of 2-methyl-5, 6-dihydro-1, 4-oxathiine-3-carboxylic acid.
A fungicide for control of bunts and smuts normally is used for the treatment of seed. It has a role as a succinate dehydrogenase inhibitor and an antifungal agrochemical.
It is an anilide, an enamide, an oxacycle, an organosulfur heterocyclic compound, an anilide fungicide and a secondary carboxamide.

Soil micro-organisms are most active at 34° - 36°C.
Soil microbial activity that reflects the microbiological processes of soil microorganisms is the potential indicator of soil quality, as plants rely on soil microorganisms to mineralize organic nutrients for growth and development.
Most soil microbes grow best at temperatures between 34 - 36° Celsius and their growth rates increase with increasing temperature up to a point.

Muriate of potash fertilizer is not produced in India.
Muriate of Potash (MOP) is a fertilizer supplying Potassium, which is one of the major plant nutrients.
India does not have any commercially viable source of potash, the entire requirement of potassic fertilizers is met through importation from foreign countries.

The incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as Glycolysis.
Glycolysis is the metabolic pathway that converts glucose (C₆H₁₂O₆) into pyruvate (CH₃COCO₂H). It does not require oxygen (In anaerobic conditions pyruvate is converted to lactic acid).
The free energy released in this process is used to form the high-energy molecules adenosine triphosphate (ATP) and reduced nicotinamide adenine dinucleotide (NADH). Glycolysis is a sequence of ten reactions catalyzed by enzymes.