Plant Pathology - Study Mode

[#701] Pore size of HEPA filters of LAI (in μ) is
Correct Answer

(B) 0.3

Explanation

Solution: The pore size of HEPA filters of LAI (in μ) is 0.3. HEPA filter, also known as high-efficiency particulate absorbing filter and high-efficiency particulate arrestance filter, is an efficiency standard of air filters. HEPA filters are composed of a mat of randomly arranged fibers. The fibers are typically composed of polypropylene or fiberglass with diameters between 0.5 and 2.0 micrometers. HEPA air filter must remove from the air that passes through 99.97% of particles whose diameter is equal to 0.3 μm, with the filtration efficiency increasing for particle diameters both less than and greater than 0.3 μm.

[#702] The technique used for maintenance and preservation of Trichoderma is
Correct Answer

(A) Soil preservation

Explanation

Solution: The technique used for maintenance and preservation of Trichoderma is Soil preservation. Fungi belonging to the genus Trichoderma are used as successful plant growth enhancers, biostimulants, biofertilizers, and as effective biocontrol agents against various pathogens. Trichoderma is stored by a long term storage method in envelopes kept in the container with a small amount of desiccant at -20°C.

[#703] The plants produce a whip like black shoot, often very long and much curved on itself in smut of sugarcane is caused by pathogen
Correct Answer

(C) Ustilago scitaminea

Explanation

Solution: The plants produce a whip-like black shoot, often very long and much curved on itself in smut of sugarcane caused by the pathogen Ustilago scitaminea. Production of whip-like structure (25 - 150 cm) from the growing point of the canes. Whip covered by translucent silvery membrane enclosing a mass of black powdery spores. Initial thin canes with elongated internodes later become reduced in length. Profuse sprouting of lateral buds with narrow, erect leaves especially in the ratoon crop.

[#704] Which of the following is a vivotoxin?
Correct Answer

(C) Fusaric acid

Explanation

Solution: Fusaric acid is a vivotoxin. Vivotoxin designates a secondary metabolite produced by the pathogen and/or its host during infection, produces disease symptoms, but is not oneself the initiating causal agent of the infection. Out of all, Fusaric-acid is the most studied pathogen-produced wilt toxin classified as a non-specific vivotoxin.

[#705] Nitrate can be absorbed by roots as it can be lost by
Correct Answer

(B) Leaching

Explanation

Solution: Nitrate can be absorbed by roots as it can be lost by Leaching. Nitrate can be absorbed by roots as it can be lost by the process of Leaching . Nitrogen can be lost from agricultural lands through soil erosion and runoff. Leaching is the loss of water-soluble plant nutrients from the soil or applying a small amount of excess irrigation to avoid salinity.