Plant Pathology - Study Mode
[#866] Who is regarded as Reconstructor of Mycology?
Correct Answer
(B) L. R. Tulsane
Explanation
Solution: L. R. Tulsane is regarded as a Reconstructor of Mycology. Mycology is the branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy, and their use to humans, including as a source for tinder, traditional medicine, food, and entheogens, as well as their dangers, such as toxicity or infection.
[#867] The nitrification process is most active when the pH is between
Correct Answer
(B) 6.5 and 7.5
Explanation
Solution: The nitrification process is most active when the pH is between 6.5 and 7.5. Nitrification is the biological oxidation of ammonia to nitrite followed by the oxidation of the nitrite to nitrate occurring through separate organisms or direct ammonia oxidation to nitrate in comammox bacteria. Nitrification is pH-sensitive and rates of nitrification will decline significantly at pH values below 6.5. The resulting decrease in pH could lead to decreasing rates of nitrification.
[#868] Colony colour of Aspergillus niger is
Correct Answer
(C) Green
Explanation
Solution: The colony colour of Aspergillus niger is Green. Aspergillus fumigatus conidia accumulate 1,8-dihydroxynaphthalene melanin in their cell wall, have a blue-green color, and are notorious for their high dispersibility. A. niger causes a disease known as "black mold" on certain fruits and vegetables such as grapes, apricots, onions, and peanuts, and is a common contaminant of food.
[#869] Maize streak virus comes under the family
Correct Answer
(B) Geminiviridae
Explanation
Solution: The maize streak virus comes under the family Geminiviridae. Geminiviridae is a family of plant viruses that encode their genetic information on a circular genome of single-stranded (ss) DNA. They have single-stranded circular DNA genomes encoding genes that diverge in both directions from a virion strand origin of replication. Maize streak virus occurs throughout Africa, where it causes what is probably the most serious viral crop disease on the continent.
[#870] Nitrogen fertilisation is applied for growth, but its excess
Correct Answer
(B) delays maturity
Explanation
Solution: Nitrogen fertilization is applied for growth, but its excess delays maturity. Nitrogen Fertilization Increases Root Growth and Coordinates the Root-Shoot Relationship in Cotton. The root system plays an important role in the growth and development of cotton, and root growth is closely related to shoot growth, both of which are affected by N availability in the soil. Excessive nitrogen causes fruiting plants to produce relatively more foliage, reducing their fruit production and delaying fruit maturity.