Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

C : N ratio of FYM is 40 : 1.
C : N ratio is the ratio of the mass of carbon to the mass of nitrogen in a substance.
FYM (Farmyard manure) is an important organic resource for agricultural production in live-stock-based farming systems in the semi-arid tropics of India.
The C : N ratio of farmyard manure is 40 : 1.

In the green cell, the enzyme catalase is localized in Peroxisomes.
Catalase is located in all major sites of H₂O₂ production in the cellular environment such as peroxisomes of higher plants.
Multiple molecular forms of catalase isozymes indicate their versatile role within the plant system.

Zygospores are the sexual spores of fungi.
Zygospores are sexual spores of Zygomycetes; they are rarely observed except in homothallic species.
Heterothallic species form zygospores on initial isolation, in which case it is advisable to make several isolates of the fungus to ensure that both mating types are acquired.

The black wart disease of potato specially confined to Darjeeling hills is caused by the pathogen Synchytrium endobioticum.
Potato wart disease is one of the most important quarantine pests for cultivated potato and is caused by the obligate biotrophic chytrid fungus Synchytrium endobioticum.
Potato wart is a soil-borne fungus that can remain dormant in a field for more than 40 years. Although potato wart poses no threat to human health or food safety, it has an impact on the economic return for potato growers by reducing yield and making potatoes unmarketable.

Seeds of pulses are inoculated with bacteria to increase N supply.
The seed needs to be adequately coated with the inoculant to accomplish the contact of bacteria with roots.
Legumes can form a symbiotic relationship with nitrogen-fixing soil bacteria called rhizobia. The result of this symbiosis is to form nodules on the plant root, within which the bacteria can convert atmospheric nitrogen into ammonia that can be used by the plant.

Major genes contribute to disease resistance in the form of Vertical resistance.
A plant variety that exhibits a high degree of resistance to a single race, or strain, of a pathogen is said to be vertically resistant; this ability usually is controlled by one or a few plant genes.
One or a few major role genes that could be sufficient to make a plant resistant to a pathogen is referred to as R-gene, monogenic, oligogenic, or vertical resistance.

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.

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.

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.

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.