Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

Chlorophyll b is C₅₅H₇₀O₆N₄Mg.
Chlorophyll b is a form of chlorophyll. Chlorophyll b helps in photosynthesis by absorbing light energy. Its color is green, and it primarily absorbs blue light.
The Chlorophyll b biosynthetic pathway utilizes a variety of enzymes. The axial ligands attached to the Mg²⁺ center are often omitted for clarity. Appended to the chlorin ring are various side chains, usually including a long phytyl chain (C₂₀H₃₉O).

Viruses contain Either RNA or DNA, never both.
The essential components of infectious viral particles are nucleic acid (the genome) and protein.
The genetic material (typically single-stranded RNA, but single-stranded DNA in some cases) is bound into the protein helix by interactions between the negatively charged nucleic acid and positive charges on the protein.

Teichoic acid is found in Gram (+) bacteria.
Teichoic acids are bacterial copolymers of glycerol phosphate or ribitol phosphate and carbohydrates linked via phosphodiester bonds.
These are found within the cell wall of Gram-positive bacteria such as species in the genera Staphylococcus, Streptococcus, Bacillus, Clostridium, Corynebacterium, and Listeria, and appear to extend to the surface of the peptidoglycan layer.
Teichoic acids that are anchored to the lipid membrane are referred to as lipoteichoic acids (LTAs), whereas teichoic acids that are covalently bound to peptidoglycan are referred to as wall teichoic acids (WTA).

Antipodal cells and egg cell has haploid structures.
Egg cells and antipodal cells have a haploid number of chromosomes. In angiosperms, a single diploid megaspore mother cell matures within an ovule. Through meiosis. It gives rise to four megaspores (haploid).

The toxicity of zinc in the soil is reduced by adding superphosphate.
Superphosphate is a component of fertilizer that primarily consists of monocalcium phosphate, Ca(H₂PO₄)₂.
Superphosphate or Super provides calcium, phosphorus and sulphur to promote legume growth and increase nitrogen fixation symbiotically from the atmosphere.
Phosphorus inhibits the availability of zinc for absorption in soil, thus, zinc toxicity is reduced by adding superphosphate.

Plants use zinc as Zn²⁺.
The Zn²⁺ cation is the predominate form taken up by plants. Function: Zinc is a component of many organic complexes and DNA proteins. It is also an important enzyme for protein synthesis.
It is used in the formation of chlorophyll and some carbohydrates and is used in the conversion of starches to sugars. Zinc is essential in the formation of auxins, which help with growth regulation and stem elongation.

The plant nutrient critical for nitrogen fixation in legumes is Mo.
Molybdenum (Mo), an essential micronutrient, plays an important role in nitrogen (N) metabolism and protein synthesis in plants.
During symbiotic N fixation, Mo acts as a cofactor for nitrogenase enzymes to catalyze the redox reaction to convert elemental N into ammonium (NH₄⁺) ions.
Supply of molybdenum and Fe to bacteroids is therefore an important process and most likely a key regulatory component in the maintenance of nitrogen fixation in legumes.

Insecticides are specific inhibitors of the Nervous system.
Many insecticides act upon the insect's nervous system, while others act as growth regulators or endotoxins.
Most act on neurons by causing a sodium/potassium imbalance preventing normal transmission of nerve impulses.

Ammonia anhydrous contains 82% nitrogen.
Ammonia anhydrous, which contains 82 percent nitrogen, is the most concentrated nitrogen fertilizer.
Anhydrous ammonia is a liquid when kept under pressure, but turns into a gas when not contained.

A. P. Michelli is the father of Mycology.
He discovered the spores of mushrooms, was a leading authority on cryptogams, and coined several important genera of microfungi including Aspergillus and Botrytis.
In this work, he gave descriptions of 1900 plants, of which about 1400 were described for the first time. Among these were 900 fungi and lichens, accompanied by 73 plates.