Plant Pathology - Study Mode

[#851] Tabtoxin is a
Correct Answer

(C) Pathotoxin

Explanation

Solution: Tabtoxin is a Pathotoxin. A chemical of biological origin, other than an enzyme, that plays an important causal role in a plant disease is known as Pathotoxin. Tabtoxin, also known as wildfire toxin, is a simple monobactam phytotoxin produced by Pseudomonas syringae. It is the precursor to the antibiotic tabtoxinine β-lactam (TBL). Tabtoxin is a dipeptide precursor to the biologically active form of TBL, differing by having an extra threonine attached by a peptide bond to the C terminus. Tabtoxin is required by BR2(R) for both chlorosis and lesion formation on the bean.

[#852] The disease damping off seedlings during nursery stage is caused by the pathogen
Correct Answer

(D) Both B and C

Explanation

Solution: The disease damping off seedlings during the nursery stage is caused by the pathogens Pythium aphanidermatum and Pythium debaryanum. Damping off is a horticultural disease or condition, caused by several different pathogens that kill or weaken seeds or seedlings before or after they germinate. It is most prevalent in wet and cool conditions. Damping off is caused by several soil-borne fungi and fungus-like organisms including Pythium, Phytophthora, Rhizoctonia, and Fusarium, which infect seedlings and cause them to 'damp off' or collapse and decay.

[#853] International seed health testing lab was established in 1918 in
Correct Answer

(C) Netherlands

Explanation

Solution: An international seed health testing lab was established in 1918 in Netherlands. The International Seed Testing Association (ISTA) is an independent, non-profit organization founded during the 4th International Seed Testing Congress in 1924. Its members work to promote uniform methods of evaluating seeds being sold internationally to facilitate the international trading of seeds and contribute to global food security. In 1918, the first seed health testing laboratory was established at the Government Seed testing laboratory in Wageningen, The Netherlands.

[#854] Endosmosis of water occurs when water potential of the cell sap is
Correct Answer

(B) Lower

Explanation

Solution: Endosmosis of water occurs when the water potential of the cell sap is Lower. Endosmosis is the movement of water inside the cell from the outer surrounding, it occurs when the cell is placed in a hypotonic solution. During endosmosis, water moves from the soil to the root which means the water potential of the cell sap of the root is lower than that of the soil. Osmotic potential (ψ s ) results from dissolved solutes in cell sap and is proportional to solute concentration and inversely proportional to cell water volume.

[#855] A fertiliser not listed in the FCO cannot be labelled an sold as fertiliser because it is
Correct Answer

(A) Not recognised as fertiliser

Explanation

Solution: A fertilizer not listed in the FCO cannot be labeled and sold as fertilizer because it is not recognized as fertilizer. The Fertilizer Control Order (FCO), 1985, enacted under The Essential Commodities Act, of 1955, is being implemented to regulate the trade, price, quality, and distribution of fertilizers in the country. The FCO provides for compulsory registration of fertilizer manufacturers, importers and dealers, specification of all fertilizers manufactured/imported and sold in the country, regulation on the manufacture of fertilizer mixtures, packing and marking on the fertilizer bags, the appointment of enforcement agencies, etc.