Free Plant Protection MCQs with Answers

• A. Fungal disease
• B. Bacterial disease
• C. Viral disease
• D. Nematode disease

Explanation: Banana bunchy top is caused by Banana bunchy top virus and is commonly spread by the banana aphid.

• A. New organ
• B. Zygote
• C. Gastrula
• D. Cancer

Explanation: Uncontrolled or abnormal mitotic division can produce a mass of cells with unchecked growth, which may develop into cancer.

• A. Rapseed/mustard
• B. Oat
• C. Tomato
• D. Barley

Explanation: Argemone mexicana, or Mexican poppy, is a serious contaminant and weed of rapeseed and mustard fields.

• A. All the above
• B. Stem saw fly
• C. Hessian fly
• D. Green bugs

Explanation: Wheat has documented resistance to greenbug, stem sawfly, and Hessian fly, so all three are included among examples of insect resistance.

• A. Fregobract
• B. Okra leaves
• C. Hairiness of leaves
• D. Smoothness leaves

Explanation: Cotton jassids show non-preference for hairy leaves because leaf trichomes hinder their movement, feeding, and egg laying.

• A. low sinigen in leaves
• B. High silicant content
• C. High DIMBOA in leaves
• D. High saponin in leaves

Explanation: High saponin content in leaves is associated with resistance to spotted aphid because saponins can deter feeding and impair insect…

• A. Van der plank (1963)
• B. Karpechenko (1927)
• C. Hull (1945)
• D. Correns (1900)

Explanation: J. E. van der Plank introduced the terms vertical resistance and horizontal resistance in his work on plant disease resistance, published…

• A. High aspartic acid
• B. Waxiness of leaves
• C. High silica content
• D. High benzol alcohol

Explanation: In barley, leaf waxiness can deter feeding and reduce acceptance by the cereal leaf beetle, making it a recognized resistance-associated…

• A. Purple stigma
• B. Low aspergine
• C. Red pericarp
• D. All the above

Explanation: Brown planthopper shows no marked preference for rice types having purple stigma, low asparagine, or red pericarp, so all three traits are…

• A. All the above
• B. Oligogenic
• C. Qualitative
• D. Race specific

Explanation: Vertical resistance is race-specific because it works against particular pathogen races, and it is usually controlled by one or a few…

• A. Leaf borer
• B. Stem borer
• C. Root borer
• D. All the above

Explanation: Silicon deposited in rice shoots strengthens plant tissues and makes them more difficult for stem-borer larvae to penetrate.

• A. Economic threshold
• B. Economic mjury level
• C. Crop scouting
• D. None of the above

Explanation: Crop scouting is the systematic inspection and monitoring of fields to measure pest pressure and assess possible economic damage.

• A. Sterilization
• B. Heating
• C. Pasteurization
• D. Neutralization

Explanation: Sterilization is the process intended to destroy all microorganisms, including resistant forms such as spores; it is therefore the closest…

• A. Broad leaved weeds
• B. Perenial plants
• C. Seasonal plants
• D. All the above

Explanation: Contact herbicides act only on the plant parts they touch and are not transported effectively to underground roots or rhizomes.

• A. Chemical and cultural method
• B. Only chemical control method
• C. Chemical, cultural, and biological method
• D. Only biological method

Explanation: Integrated pest management combines compatible methods such as chemical, cultural and biological control to keep pests below damaging…

• A. Cytokinin and ethylene
• B. non of there
• C. Trytophan
• D. Phenolics and. terpenoids

Explanation: Most allelochemicals are grouped chemically into phenolic compounds and terpenoids, which can inhibit or stimulate neighbouring plants and…

• A. Diffusion
• B. Root exudation
• C. Mass flow

Explanation: Root exudation releases compounds directly from living roots into the surrounding soil, making it a major route by which allelochemicals…

• A. Microorganisms
• B. None of the above
• C. Weeds

Explanation: Sunflower residues and root exudates contain allelochemicals that can suppress the germination and growth of several weed species.

• A. International pest management
• B. Interior pest management
• C. non of there
• D. Integrated pest management

Explanation: IPM means Integrated Pest Management, a strategy that combines biological, cultural, mechanical and carefully selected chemical methods to…

• A. Rhizoeionia solani
• B. Rhizoctonia bataticola
• C. Both of them

Explanation: Cotton root rot may be associated with both Rhizoctonia solani and Rhizoctonia bataticola, so the combined option is appropriate.