Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

Kittleson's killer is the other name for Captan.
It is trichloromethyl-thio-4-cyclohexene-1,2- dicarboximide. Kittleson 1952 first prepared this compound and reported its fungicidal property. Thus, called "Kittleson‟s Killer”.
Captan is a general-use pesticide (GUP) that belongs to the phthalimide class of fungicides. It is a white solid, although commercial samples appear yellow or brownish.

250 pollen mother cells will form 1000 pollen grains.
One diploid microspore mother cells by meiosis form 4 tetrads of haploid microspores which become 4 pollen grains.
Thus, 250 pollen mother cells will produce 1000 pollen grains, by undergoing 50 rounds of meiosis.

In Tobacco callus; a higher concentration of cytokinin and a lower concentration of auxin shall induce shoot differentiation in a combination of auxin and cytokinin.
For callus initiation, a high concentration of auxins and a low concentration of cytokinins were used, whereas a high concentration of cytokinins and a low concentration of auxins were used for shoot-bud differentiation.
An intermediate ratio of auxin and cytokinin promotes callus induction, while a high ratio of auxin-to-cytokinin or cytokinin-to-auxin induces root and shoot regeneration, respectively.

Cellular totipotency was demonstrated by F. C. Steward.
Cellular totipotency is the inherent potentiality of a plant cell to give rise to a whole plant, a capacity that is retained even after a cell has undergone final differentiation in the plant body.
The more cell types a cell can differentiate into, the greater its potency. Steward conducted experiments on carrot root tissues and was the first to demonstrate totipotency.

Sulphur is a nutrient element that is not a micronutrient.
There are about seven nutrients essential to plant growth and health that are only needed in very small quantities.
Sulphur is a macro element in plant nutrition. Elemental Sulphur is available to plants. Oxides are converted to sulphates along with Sulphur. It is essential for many growth functions in plants including nitrogen metabolism, enzyme activity, and protein and oil synthesis.

Nitrogen absorbed by plants is reduced to ammonia.
Nitrogen assimilation is the formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds present in the environment.
Organisms like plants, fungi, and certain bacteria that can fix nitrogen gas (N₂) depend on the ability to assimilate nitrate or ammonia for their needs.
Plants absorb nitrogen from the soil in the form of nitrate (NO₃^-) and ammonium (NH₄⁺). In aerobic soils where nitrification can occur, nitrate is usually the predominant form of available nitrogen that is absorbed.

The efficiency of urea can be increased by using neem cake.
Nitrification inhibitors like neem cake when applied along with urea reduce losses of applied nitrogen, thereby resulting in an improved yield of crops.
The efficiency of the nutrient may be improved by combining the use of organic neem cake with the inorganic source of nitrogen fertilizer namely urea.

The biological method for determining the deficiency of lime, P and K is Azotobacter Plague Test.
The sensitivity of the Azotobacter group of organisms to soil acidity and lack of available phosphate has been long recognized and has been the basis of microbiological tests to check soil deficiencies.

E. J. Butler is the father of plant pathology in India.
Sir Edwin John Butler was an Irish mycologist and plant pathologist. He became the Imperial Mycologist in India and later the first director of the Imperial Bureau of Mycology in England.
During his twenty years in India, he began large-scale surveys on fungi and plant pathology and published the landmark book Fungi and Disease in Plants: An Introduction to the Diseases of Field and Plantation Crops, and has been called the Father of Mycology and Plant Pathology in India.

The following processes on the host plant occur during pathogenesis. The correct sequence of these processes is
1. Landing of inoculum
2. Germination
3. Penetration
4. Recognition
5. Establishment and sporulation
Pathogenesis is the process by which a disease or disorder develops. It can include factors that contribute not only to the onset of the disease or disorder but also to its progression and maintenance.