Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

For manufacturing of K₂O, Biotite is used.
Biotite is a common group of phyllosilicate minerals within the mica group. Its chemical formula is K(Mg, Fe)₃AlSi₃O₁₀(F, OH)₂.
It is regarded as a mineral species by the International Mineralogical Association until 1998.

Amanita fungi are poisonous among all the given options.
The more poisonous fungi often have appropriately evocative names such as Satan's bolete, yellow sickener, the deadly fiber cap, beechwood sickener, funeral bell, fools mushroom, and false morel.
Amanita muscaria is a highly poisonous mushroom; the primary effects usually involve the central nervous system, and in severe poisoning, symptoms may manifest in coma and rare cases lead to death.

The first carbon dioxide acceptor in C₄ plants is Phosphoenol-pyruvate.
C₄ carbon fixation is one of three known photosynthetic processes of carbon fixation in plants.
CO₂ is initially fixed in the mesophyll cells by the enzyme PEP carboxylase which reacts the three-carbon phosphoenolpyruvate (PEP) with CO₂ to form the four-carbon oxaloacetic acid (OAA). The resulting pyruvate (PYR), together with about half of the phosphoglycerate (PGA) produced by RuBisCO, diffuses back to the mesophyll.

The nematodes lack organs for Circulation and Respiration.
While nematodes have digestive, reproductive, nervous, and excretory systems, they do not have discrete circulatory or respiratory systems.
Nematodes use chemosensory and mechanosensory neurons embedded in the cuticle to orient and respond to a wide range of environmental stimuli.

Phosphorus brings about healthy root growth.
Phosphorus is important in cell division and the development of new tissue. Phosphorus is also associated with complex energy transformations in the plant.
Adding phosphorus to soil low in available phosphorus promotes root growth and winter hardiness, stimulates tillering, and often hastens maturity.

Formation of embryo directly from nucellus and integument is Adventitive polyembryony.
Polyembryony, is a condition in which two or more embryos develop from a single fertilized egg, forming what in humans is known as identical twins.
A common phenomenon in many plant and animal species, polyembryony occurs regularly in the nine-banded armadillo, which usually gives birth to four identical young.
In adventive polyembryony, there is the formation of extra embryos due to sporophytic budding.

The Colletotrichum jalcatum produces Conidiospores.
Colletotrichum falcatum, a concealed fungal ascomycete causes red rot, which is a serious disease in sugarcane. It infects economically important stalk tissues, considered a storehouse of sugar in sugarcane.
The Colletotrichum falcatum belongs to the class Ascomycetes and it produces conidiospores. It causes the prevalent red-rot disease of sugarcane by growing on the stems and leaves of sugarcane plants in every sugarcane-producing zone.

The most common zinc fertilizer is Zinc-sulphate.
Inorganic sources include zinc sulphate, zinc oxide, zinc carbonate, zinc nitrate, and zinc chloride. Zinc sulphate is the most commonly used zinc fertilizer worldwide and is available in both crystalline monohydrate and heptahydrate forms.

Hydroponics is Soil-less cultivation of the plant.
Hydroponics is a type of horticulture and a subset of hydroculture that involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions in aqueous solvents.
The nutrients used in hydroponic systems are different organic or inorganic sources, including fish excrement, duck manure, purchased chemical fertilizers, or artificial nutrient solutions.

The change of NH⁺₄ to NO^-₃ is called Nitrification.
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.
The transformation of ammonia to nitrite is usually the rate-limiting step of nitrification. Nitrification is an important step in the nitrogen cycle in soil. Nitrification is an aerobic process performed by small groups of autotrophic bacteria and archaea.