Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

A pesticide of lipophilic nature is DDT.
DDT is hydrophobic and lipophilic requiring an organic solvent (e.g., oil or fat) as a vehicle. Gastrointestinal absorption is slow with symptoms taking several hours to develop.
DDT is metabolized slowly by liver microsomal enzymes initially dehydrochlorinating DDT to DDE and reducing it to DDD.

Resistance to pests and diseases is often provided by K.
Resistance is defined as a change in the sensitivity of a pest population to a pesticide, failing a correct application of the pesticide to control the pest.
The adequate concentration of potassium nitrate improves plant resistance to pathogens or pests attack boosting tolerance of the crops.

Sphaeroplast is a cell derived from PPLO.
A spheroplast is a microbial cell from which the cell wall has been almost completely removed, as by the action of penicillin or lysozyme.
The term spheroplast refers to cells from which the peptidoglycan component but not the outer membrane component of the cell wall has been removed.

Active and passive transports across cell membranes differ in Passive transport is along the concentration gradient while active transport is due to metabolic energy.
Active transport is the process of moving molecules across a cellular membrane through the use of cellular energy.
Passive transport is a type of cellular transport in which substances such as ions and molecules move down their respective concentration gradients. It does not require energy input.

A. Oxycarboxin - Plantvax
Oxycarboxin is an organic compound used as a fungicide. It is an anilide. The other name of this compound is plantvax.
B. Carboxin - Benlate is not correctly matched.
Carboxin is sold as Vitavax. It is used as a seed treatment and is effective against damping-off diseases caused by Rhizoctonia and against the various smuts of grain crops. Benlate, a fungicide, has been used for over 20 years in Florida to treat crops and ornamentals.
C. MBC - Bavistin
Bavistin, is a benzimidazole fungicide containing methyl benzimidazol-2-yl carbamate (MBC). It is a broad-spectrum systemic fungicide that is effective against a wide range of pathogenic fungi and is highly specific in its control of important plant pathogens on a variety of crops, ornamental plants, and plantation crops.
D. Benomyl - Benlate
Benomyl (also marketed as Benlate) is a fungicide introduced in 1968 by DuPont. It is a systemic benzimidazole fungicide that is selectively toxic to microorganisms and invertebrates, especially earthworms, but nontoxic toward mammals.

The Bordeaux mixture was discovered by Millardet at Bordeaux in France in the year 1885.
The Bordeaux mixture is a combination of copper sulphate, lime and water. This was accidentally discovered in 1882 and introduced in the year 1885 by P. M. A. Millardet from the University of Bordeaux, France for the management of Downy mildew of grapes.

G + C content of prokaryotes is 20%.
GC content is found to be variable with different organisms, the process of which is envisaged to be contributed to by the variation in selection, mutational bias, and biased recombination-associated DNA repair.
The average GC content in human genomes ranges from 35% to 60% across 100-Kb fragments, with a mean of 41% and in prokaryotes, it is near 20%.

Sixteen nutrients are essential for all crops.
Sixteen elements are considered essential nutrients for plants for overall growth and development. These are carbon (C), oxygen (O), hydrogen (H), nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulphur (S), iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), boron (B), molybdenum (Mo) and chlorine (Cl).

Fungicide acting on β-tubulin assembly is Carbendazim.
Carbendazim, a systemic benzimidazole fungicide, is applied repeatedly to control plant diseases including soilborne diseases, over a growing season.
The mode of action of carbendazim involves interference in the biosynthesis of DNA during fungal cell division. carbendazim inhibits the assembly of microtubules in fungi while leaving plant microtubules unharmed.

Among the given options, Zinc (Zn) is a micronutrient that is required in small amounts for the proper functioning of plants whereas calcium, Nitrogen, and phosphorus are macronutrients that are required in large amounts by plants.
Micronutrients are essential dietary elements required by organisms in varying quantities throughout life to orchestrate a range of physiological functions to maintain health.
Zinc participates in chlorophyll formation, and also activates many enzymes. Symptoms of zinc deficiency include chlorosis and stunted growth.