Plant Pathology - Study Mode

[#516] Molybdenum is involved in plant metabolism in
Correct Answer

(C) Nitrate reduction

Explanation

Solution: Molybdenum is involved in plant metabolism in Nitrate reduction. Molybdenum nutrition is an essential component of healthy plant growth. Molybdate which is the predominant form available to plants is required at very low levels where it is known to participate in various redox reactions in plants as part of the pterin complex Moco. 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 (NH 4 + ) ions.

[#517] Formation of gametophyte directly from sporophyte without meiosis is
Correct Answer

(A) Apospory

Explanation

Solution: The formation of gametophyte directly from sporophyte without meiosis is Apospory. Apospory is the development of 2n gametophytes, without meiosis and spores, from vegetative, or nonreproductive, cells of the sporophyte. It develops in pteridophytes that have a mineral nutrition shortage due to insufficient minerals in the soil.

[#518] Sensitivity of ELISA lies in the range
Correct Answer

(B) 1 - 10 ng/l

Explanation

Solution: The sensitivity of ELISA lies in the range of 1 - 10 ng/l. The typical detection range for an ELISA is 0.1 to 1 fmole or 0.01 ng to 0.1 ng, with sensitivity dependent upon the particular characteristics of the antibody-antigen interaction. ELISAs tend to be the most sensitive immunoassays due to the binding characteristics of the antibodies and the amplification or different read-out systems used.

[#519] Tangro disease of rice is spread by
Correct Answer

(A) Nephotettix virescens

Explanation

Solution: Tangro disease of rice is spread by Nephotettix virescens. Tungro disease viruses are transmitted from one plant to another by leafhoppers that feed on tungro-infected plants. The most efficient vector is the green leafhopper. Leafhoppers can acquire viruses from any part of the infected plant by feeding on it, even for a short time. It is transmitted by leafhoppers only in the presence of RTSV. The major vector is the rice green leafhopper, Nephotettix virescens, and it can also be transmitted by some other leafhopper species such as N. nigropictus, N.

[#520] The term hypersensitive response is coined by
Correct Answer

(D) Stakman

Explanation

Solution: The term hypersensitive response is coined by Stakman. Hypersensitive response (HR) is a mechanism used by plants to prevent the spread of infection by microbial pathogens. HR is characterized by the rapid death of cells in the local region surrounding infection and it serves to restrict the growth and spread of pathogens to other parts of the plant. HR is commonly thought of as an effective defence strategy against biotrophic plant pathogens, which require living tissue to gain nutrients.