Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

During the formation of pollen grains, a microspore mother cell undergoes one meiotic division.
The development of pollen grains takes place in the anther. Pollen development begins when specialized cells (microsporocytes) differentiate in young anthers. There are generally hundreds or thousands of microsporocytes per anther and each passes through meiosis to produce four haploid microspores.

The share of urea in the N production pattern is 85%.
While India uses many types of fertilizers, urea accounts for most of the consumption of N and DAP for most of that of P₂O₅.
Urea accounts for 85 percent of the total consumption of straight N fertilizers.

The formula for chlorophyll a is C₅₅H₇₂O₅N₄Mg.
Chlorophyll is any of several related green pigments found in cyanobacteria and the chloroplasts of algae and plants. Chlorophyll allows plants to absorb energy from light.
All are defined as derivatives of the parent chlorin by the presence of a fifth, ketone-containing ring beyond the four pyrrole-like rings.
The only difference between chlorophyll a and chlorophyll b is that the former has a methyl group whereas the latter has a formyl group. This difference causes a considerable difference in the absorption spectrum, allowing plants to absorb a greater portion of visible light.

Dispersal of spores by a human is known as Anthropochory.
The dispersal of seeds, spores, or other reproductive botanical material, or reproductively capable animals, by humans as a routine means of reproductive dispersal of that species.
Human dispersers differ from animal dispersers by having much higher mobility, based on the technical means of human transport. Humans may disperse seeds by many various means and some surprisingly high distances have been repeatedly measured.

ATP is injected in cyanide poisoning because it is necessary for cellular functions.
Plants have an alternative electron transfer pathway available that passes electrons directly from ubiquinone to O₂, which confers cyanide resistance by bypassing COX.
ATP is the power currency of a cell and it is injected in cyanide poisoning as it breaks down cyanide, necessary for the proper functioning of the cell.

Constituents of pigment system I are located on the outer surface of granal and stromal thylakoids.
Photosynthetic pigments are the molecules responsible for absorbing electromagnetic radiation, transferring the energy of the absorbed photons to the reaction center, and for photochemical conversion in the photosynthetic systems of organisms capable of photosynthesis.
The pigment system I (PSI) complex consists of 200 chlorophylls, 50 carotenoids and a molecule of chlorophyll an absorbs light at 700 nm (P700) and this constitutes the reaction center of photosystem I.

Phytoplasma was 1^st observed in Mulberry dwarf.
Phytoplasmas were discovered in 1967 by Japanese scientists who termed them mycoplasma-like organisms.
Phytoplasmas can be found as far back as 1603 in mulberry dwarf disease in Japan. Such diseases were originally thought to be caused by viruses, which, like phytoplasmas, require insect vectors, and cannot be cultured.

Hybridoma technology is used to produce monoclonal antibodies.
Hybridoma technology is one of the most common methods used to produce monoclonal antibodies.
In this process, antibody-producing B lymphocytes are isolated from mice after immunizing the mice with specific antigens and are fused with immortal myeloma cell lines to form hybrid cells, called hybridoma cell lines.

The mineralization of organic phosphorus has been studied about C/N/P ratio.
Mineralization is a process through which organic phosphorus in soil is converted into inorganic phosphorus with the help of soil microbes. Immobilization, on the other hand, is the reverse of mineralization.
Organic matter is initially synthesized in aquatic ecosystems mostly through algal photosynthesis, and the C : N : P. the ratio is well known to be close to the Redfield ratio. However, during the decomposition of organic matter, the behavior and the rates of mineralization of C, N, and P can vary.

Cytochrome is a Fe-containing porphyrin pigment.
Cytochromes are redox-active proteins containing a heme, with a central Fe atom at its core, as a cofactor. They are involved in the electron transport chain and redox catalysis.
Cytochrome function is linked to the reversible redox change from ferrous (Fe(II)) to the ferric (Fe(III)) oxidation state of the iron found in the heme core.