Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

An antitranspirant is Phenyl mercuric acetate.
Phenylmercuric acetate is an organomercury compound used as a preservative, disinfectant, and antitranspirant.
It is an organomercury compound used as a preservative, disinfectant, and antitranspirant. It kills crabgrass, the seedlings of which are especially vulnerable, but leaves most lawn grasses intact.

A mature male gametophyte is formed from pollen mother cell by one meiotic division and two meiotic divisions.
At maturity, the male gametophyte consists of three cells, the vegetative cell and the two sperm cells, which lie within the cytoplasm of the vegetative cell.
The male gametophyte develops and reaches maturity in an immature anther. In a plant's male reproductive organs, the development of pollen takes place in a structure known as the microsporangium.

R.Q. for organic acid is > 1.
A respiratory quotient is a dimensionless number used in calculations of basal metabolic rate (BMR) when estimated from carbon dioxide production.
It is calculated from the ratio of carbon dioxide produced by the body to oxygen consumed by the body. It is measured using a respirometer.
R.Q. of organic acid is more than one it is 1.6 for tartaric acid, and 1.33 for malic acid.

The first Indian scientist K. R. Kirtikar collected and identified fungi in India.
Lieutenant-Colonel Kanhoba Ranchoddas Kirtikar FLS IMS was an army surgeon in British India and an amateur botanist. An early Indian member of the Bombay Natural History Society he had a special interest in medicinal plants.
K. R. Kirtikar was the first Indian scientist who collected and identified the fungi in the country. He took an interest in fungi, cryptogams and algae that grow in hot-water springs at Bhiwandi.

Ceratocystis pathogen is polyletic in nature.
Ceratocystis fimbriata is a fungus and a plant pathogen attacks such diverse plants as the sweet potato. It is a diverse species that attacks a wide variety of annual and perennial plants.
Ceratocystis fimbriata produces ascospores, and these spores are found at the top of fruiting bodies known as perithecia. These ascospores enter and infect new plants through wounds on any part of the plant/tuber/etc and are commonly dispersed by insects, wind and equipment.
Polylectic refers to an insect that collects pollen from the flowers of a variety of unrelated plants.

The difference between the diffusion pressure of pure solvent and solution is called diffusion pressure deficit (DPD).
It is a reduction in the diffusion pressure of the solvent in the solution over its pure state due to the presence of solutes in it and forces opposing diffusion.
In ascending order of DPD, it can be arranged as Root hair > Cortical cell > Mesophyll cell.

Entry of pollen tube through micropyle is Porogamy.
The property of having the pollen tube in a seed plant enter the ovule by way of the micropyle is termed Progamy.

Cut Apple turns brown but does not do so if dipped in an ascorbic acid solution due to the inactivation of polyphenol oxidase.
When oxygen is present in cells, polyphenol oxidase enzymes in the chloroplasts rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones, colourless precursors to brown-coloured secondary products.
Ascorbic acid reacts with oxygen before it reacts with polyphenol oxidase, as the oxygen of air reacts with polyphenol oxidase causing the browning of cut apples.

Photolithotrophs (photoautotrophs) obtain energy from radiations and carbon from inorganic compounds.
Lithotrophs are a diverse group of organisms using an inorganic substrate to obtain reducing equivalents for use in biosynthesis or energy conservation via aerobic or anaerobic respiration.
The term "lithotroph" was created from the Greek terms 'lithos' (rock) and 'troph' (consumer), meaning "eaters of rock".

D. I. Arnor proposed the criteria for the essentiality of plant nutrients.
D. I. Arnor and Stout proposed the criteria for the essentiality of plant nutrients in 1939. The elements that are considered essential elements in deficiency of which the plant must be unable to complete its life cycle.
There are 17 elements classified as essential elements and these are carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, Sulphur, calcium, magnesium, boron, chlorine, copper, iron, manganese, molybdenum, nickel and zinc.