Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

Malathion is present in Finit/Flit.
Malathion is an organophosphate insecticide that acts as an acetylcholinesterase inhibitor. Malathion is a pesticide that is widely used in agriculture, residential landscaping, public recreation areas, and in public health pest control programs such as mosquito eradication.
Malathion is produced by the addition of dimethyl dithiophosphoric acid to diethyl maleate or diethyl fumarate. The compound is chiral but is used as a racemate.

J. H. Cragie studied Sex in rust fungi.
John Hubert Craigie was a Canadian plant pathologist. He is known for his "research and development of rust-resistant cereals which have been of vital significance to Canada as a cereal producing nation.
In 1930, he received a Ph.D. from the University of Manitoba. In 1926, he published "Discovery of the Function of the Pycnia of the Rust Fungi.

Cells absorb water through Osmosis and Imbibition only.
Both phenomena help in the metabolic activity of the plant. The process of adsorption of water by solid particles of a substance without forming a solution is called imbibition.
Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of higher concentration to an area of lower concentration. Water moves into and out of cells by osmosis.

Parasexuality was 1^st reported in Aspergillus nidulans.
The parasexual cycle, a process restricted to fungi and single-celled organisms, is a ccnonsexual mechanism of parasexuality for transferring genetic material without meiosis or the development of sexual structures.
It was first described by Italian geneticist Guido Pontecorvo in 1956 during studies on Aspergillus nidulans.
A parasexual cycle is initiated by the fusion of hyphae during which nuclei and other cytoplasmic components occupy the same cell.

Apparatus to measure the rate of respiration and R.Q. is Respirometer.
A respirometer is a device used to measure the rate of respiration of a living organism by measuring its rate of exchange of oxygen and/or carbon dioxide.
Respirometers are used primarily to perform intermittent measurements of tidal and minute volume and are most widely used to assess that mechanical ventilators are delivering an appropriate volume of gas.

The mature particle of a plant virus is generally known as Virion.
The virion is the complete infectious virus particle, including a genome comprising one or a few molecules of either DNA or RNA, surrounded by a morphologically defined protein coat, the capsid; the capsid and the enclosed nucleic acid together constitute the nucleocapsid.

Fried egg colonies appearance is a characteristic feature of Mycoplasmas.
Fried egg bacteria are the characteristic appearance of Mycoplasma. Mycoplasmas are the smallest free-living microorganisms and belong to the group of bacteria which lack a cell wall and can take up any shape.
When they are allowed to grow on an artificial medium they appear biphasicand in addition to this they lack a cell wall and are filamentous to spherical cells thus giving a fried egg appearance. It lacks any spores and movement appendages.

Nitrogen is a nutrient that absorbs both positive and negative forms.
Nitrate is the form of nitrogen most used by plants for growth and development. Nitrate is the form that can most easily be lost to groundwater. Ammonium taken in by plants is used directly in proteins.
Plants absorb nitrogen from the soil as both NH₄⁺ and NO₃^- ions, but because nitrification is so pervasive in agricultural soils, most of the nitrogen is taken up as nitrate.

Photorespiration is favoured by High oxygen and low carbon dioxide.
Photorespiration refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis.
When the stomata are closed to prevent water loss during drought: this limits the CO₂ supply, while O₂ production within the leaf will continue. This ability to avoid photorespiration makes these plants hardier than other plants in dry and hot environments, wherein stomata are closed and internal carbon dioxide levels are low.

Ubiquinone is a component of ETC and is not a protein.
Ubiquinone is a mobile component of the mitochondrial electron transport chain, where it acts as a pro-oxidant in its ubisemiquinone state.
Ubiquinone (Q) accepts the electrons from both complex I and complex II and delivers them to complex III. Complex III pumps protons through the membrane and passes its electrons to cytochrome c for transport to the fourth complex of proteins and enzymes.