Plant Pathology - Study Mode
[#626] The number of chlorophyll molecules in a quantasome is
Correct Answer
(B) 200 - 250
Explanation
Solution: The number of chlorophyll molecules in a quantasome is 200 - 250. Quantasomes were first identified by Roderic B. Park in 1962. Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts. Each quantasome contains about 230 - 250 chlorophyll molecules and 50 molecules of carotenoids.
[#627] Metabolism of one palmitic acid yields ATP
Correct Answer
(C) 136 ATP
Explanation
Solution: Metabolism of one palmitic acid yields 136 ATP. Palmitic Acid is a saturated long-chain fatty acid with a 16-carbon backbone. Palmitic acid is found naturally in palm oil and palm kernel oil, as well as in butter, cheese, milk and meat. Palmitic acid is the first fatty acid produced during fatty acid synthesis and is the precursor to longer fatty acids. Complete oxidation of palmitic acid leads to the production of 136 ATPs.
[#628] RQ of sprouting potato is
Correct Answer
(A) 1
Explanation
Solution: 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.
[#629] Boron is injurious to plant when irrigational water contains . . . . . . . . concentration of boron.
Correct Answer
(D) > 3 ppm
Explanation
Solution: 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.
[#630] The maximum concentration limit of urea for spraying is
Correct Answer
(C) 4%
Explanation
Solution: 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.