Free Plant Protection MCQs with Answers

• A. Xanthomonas campestris
• B. Ustilago maydis
• C. Puccinia graminis
• D. Phytophthora infestansAgronomy study materials

Explanation: Late blight is caused by the oomycete Phytophthora infestans, especially under cool, humid conditions.

• A. Either DNA or RNA
• B. DNA
• C. RNA
• D. Both RNA and DNA

Explanation: A plant virus contains either RNA or DNA as its genetic material, but normally not both.

• A. Aphid
• B. Brown plant hopper
• C. Mango hopper
• D. White-backed plant hopper

Explanation: Rice hopper burn is classically associated with brown planthopper feeding, which removes sap and injects toxic substances into the plant.

• A. Vector
• B. Patho-inductor
• C. Transmission
• D. Both a & b

Explanation: Transmission is the spread of a disease or pathogen from one individual or host to another.

• A. All of the aboveAccess Government Careers
• B. Fungi
• C. Protozoa
• D. Bateria, viruses

Explanation: Pathogens include disease-causing bacteria, viruses, fungi and protozoa, so all the listed groups are represented.

• A. G.N. Agrios
• B. Anton de Bary
• C. Stanley
• D. MilarditExplore Farming Tools

Explanation: Anton de Bary established the scientific study of plant diseases through his work on fungi and demonstrated the cause of potato late…

• A. Stanley
• B. Watson and Crick
• C. Beijerinck
• D. Adolf Mayer

Explanation: M. W. Beijerinck demonstrated that the agent causing tobacco mosaic disease was a multiplying infectious substance that passed through…

• A. Botany
• B. None of theseExplore Farming Tools
• C. Zoology
• D. Agriculture

Explanation: Plant pathology is treated in agricultural education as the agricultural science concerned with plant diseases, their causes, and control.

• A. Reflex (involuntary movement)
• B. Taxis
• C. Kinesis
• D. Transverse orientation (Keeping a fix angle on a distance)

Explanation: Movement of an organism directionally toward or away from a stimulus is taxis; movement away from light is specifically negative…

• A. Subdivision of the ventral nerve cord
• B. Mechanoreceptor used for proprioception
• C. Functional unit of the compound eye
• D. Ventral lobe of the insect's brain

Explanation: An ommatidium is one optical unit of an insect compound eye, containing photoreceptor cells that contribute to image formation.

• A. By fungi parasitising animal tissues
• B. None of These
• C. In artificial cultures
• D. By hypha of obligate parasite

Explanation: Haustoria are specialised absorptive branches formed by the hyphae of obligate parasitic fungi, allowing them to obtain nutrients from…

• A. Rasping
• B. Siphoning type
• C. Sponging type
• D. Piecing sucking type

Explanation: Jassids, aphids and true bugs pierce plant tissues and suck up sap, so they have piercing-sucking mouthparts.

• A. Costa
• B. Collophore
• C. Embolium
• D. Ectoparasitoid

Explanation: The collophore is a tubular, often protrusible structure on the first abdominal segment of springtails and helps in adhesion and water…

• A. Ambulacrum
• B. Anholocyclic
• C. Amphitoky
• D. None of the above

Explanation: Amphitoky is a form of parthenogenesis in which unfertilized eggs produce both male and female offspring.

• A. Cenchri
• B. Annulate
• C. Apical
• D. Cauda

Explanation: The cauda is the tail-like projection at the posterior end of an aphid's abdomen and is commonly used in aphid identification.

• A. Chaetotaxy
• B. Chela
• C. Chitin
• D. Both b & c

Explanation: Chaetotaxy means the arrangement, number, and distribution of bristles or setae on an organism, a feature especially useful in identifying…

• A. Sclerite
• B. Somites
• C. Sutures
• D. Acron

Explanation: Insect body regions are divided into sclerites by external grooves called sutures.

• A. Xanthomonas
• B. Erwinia
• C. Pseudomonas
• D. Corynebacterium

Explanation: Corynebacterium is a Gram-positive phytopathogenic bacterium, whereas Xanthomonas, Pseudomonas and Erwinia are generally Gram-negative.

• A. Dung substratum (herbivore feces)
• B. Deadwood
• C. Decaying leaves
• D. Food articles

Explanation: Coprophilic fungi are specialized to grow on dung, particularly the feces of herbivores.

• A. Downy mildews
• B. Powdery mildews
• C. Covered smut
• D. Late blight of potato

Explanation: Erysiphe is a genus of fungi that causes powdery mildew, producing a characteristic white, flour-like growth on plant surfaces.