Plant Pathology - Study Mode
[#746] Nutrient movement slows down in a dry soil due to
Correct Answer
(A) Less water
Explanation
Solution: Nutrient movement slows down in dry soil due to less water. As water content decreases, soil matric potential decreases, becoming more negative, and as a result, water is held more strongly to mineral surfaces due to cohesive forces between water molecules and adhesive forces associated with water and mineral particles. Water is essential for cellular homeostasis because it transports nutrients to cells and removes wastes from cells. It is the medium in which all transport systems function, allowing exchanges between cells.
[#747] Which is sensitive to longer wavelengths of light?
Correct Answer
(B) PS I
Explanation
Solution: PS I is sensitive to longer wavelengths of light. In Photosystem I (PS I) long-wavelength chlorophylls (LWC) of the core antenna are known to extend the spectral region up to 750 nm for absorbance of light that drives photochemistry.
[#748] Who described the taxonomy of plant rust?
Correct Answer
(B) J. C. Arthur
Explanation
Solution: J. C. Arthur described the taxonomy of plant rust. J. C. Arthur, an American botanist discovered basic facts about the parasitic fungi known as rusts. Rust affects many economically important plant species and usually appears as yellow, orange, red, rust, brown, or black powdery pustules on leaves, young shoots, and fruits. Plant growth and productivity are commonly reduced, and some plants wither and die back. Rusts are a group of fungal diseases affecting the aerial parts of plants. Leaves are affected most commonly, but rust can also be found occasionally on stems and even flowers and fruit.
[#749] The most common phosphate fertiliser in India
Correct Answer
(C) DAP
Explanation
Solution: The most common phosphate fertilizer in India is DAP. Di-ammonium Phosphate popularly known as DAP is a preferred fertilizer in India because it contains both Nitrogen and Phosphorus which are primary macro-nutrients and part of 18 essential plant nutrients. DAP (NH 4 ) 2 HPO 4 : Fertilizer grade DAP Contains 18% Nitrogen and 46% Phosphorus (P 2 O 5 ). DAP fertilizer is an excellent source of P and nitrogen (N) for plant nutrition. It’s highly soluble and thus dissolves quickly in soil to release plant-available phosphate and ammonium.
[#750] Which Penicillium species used in 'Cheese' making
Correct Answer
(B) Penicillium roqueforti
Explanation
Solution: Penicillium roqueforti is the Penicillium species used in 'Cheese' making. Penicillium roqueforti is a filamentous fungus used for making blue cheeses worldwide. It also occurs as a food spoiler and in silage and wood. It is used as a fungal starter culture for the production of several blue-veined kinds of cheese, with both proteolytic and lipolytic enzymes produced by the fungus involved in cheese ripening and flavor production. The fungus has the lowest oxygen requirements for the growth of any Penicillium species.