Plant Pathology Quiz

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Questions and Answers

Which of the following diseases is caused by a protozoan organism?

Red rust of mango

Root knot on vegetables

Hart rot of coconut (correct)

Downy mildew of grape

Which of the following is NOT classified under flowering plant parasites?

Orobanche on tomato

Mollicutes causing corn stunt (correct)

Dodder on niger

Striga on sugarcane

What characteristic is NOT true of Mycoplasma?

They are filterable through bacterial filters

They have a rigid cell wall (correct)

They are unicellular

They can form typical 'fried-egg' shaped colonies

Which type of disease affects the absorption and accumulation of water and minerals?

Root rot Signup and view all the answers

What is a characteristic of diseases caused by Mycoplasma?

They are thermolabile Signup and view all the answers

Which of the following diseases affects the growth (meristematic) activity of plants?

Gall Signup and view all the answers

Which of the following is categorized as a complete root parasite?

Orobanche on tobacco Signup and view all the answers

Which disease primarily affects the physiological process of photosynthesis?

Grapevine leafroll Signup and view all the answers

What environmental condition is most conducive to the development of the Peronosporaceae family pathogens?

High relative humidity Signup and view all the answers

What type of rot is primarily caused by the action of pectinolytic enzymes on plant tissues?

Soft rot Signup and view all the answers

Which pathogen is responsible for crown gall formation in plants?

Agrobacterium tumefaciens Signup and view all the answers

What symptom is characterized by localized enlargement of plant parts due to changes in growth regulator concentration?

Galls Signup and view all the answers

Which disease is directly associated with the sudden death of plant organs, causing them to turn brown or black?

Blight Signup and view all the answers

What is the distinguishing feature of powdery mildew in mango during winter season?

Observation on young leaves and inflorescence Signup and view all the answers

What characteristic distinguishes leaf curl symptoms from other plant diseases?

Thickening of veins and small leaf projections Signup and view all the answers

Which of the following conditions results in spot formation on plant leaves?

Localized death of cells within a limited area Signup and view all the answers

What was Theophrastus' explanation for the cause of plant diseases?

Nutritional deficiencies and bad air Signup and view all the answers

Which ancient Indian text is considered the oldest regarding agriculture and plant diseases?

Krishi Parashar Signup and view all the answers

Who is recognized as the Father of Mycology?

Micheli, P.A. Signup and view all the answers

What role did CuSO4 have according to the research mentioned?

It serves as a chemical treatment for controlled diseases Signup and view all the answers

What was the primary concern of the Roman festival Rubigalia?

To please God Rubigus for better crop yield Signup and view all the answers

What significant discovery about plant diseases did Benedict Prevost make?

Microorganisms are responsible for diseases Signup and view all the answers

What specific effect did Tillet observe regarding wheat seeds with black powder?

They produced more diseased plants Signup and view all the answers

What was the contribution of Anton van Leeuwenhoek to the study of plant pathology?

He developed the first microscope and described bacteria Signup and view all the answers

What term did Martinus Wilhem Beijerinck use to describe the causal agent of tobacco mosaic?

Contagium vivum fluidum Signup and view all the answers

Which of the following is true regarding the findings of W.M. Stanley?

He identified a crystalline protein from TMV and confirmed that it could replicate. Signup and view all the answers

What key characteristic distinguishes viroids from conventional viruses?

Viroids consist of a small, naked single-stranded circular molecule of RNA. Signup and view all the answers

Which scientist is recognized as the Father of Plant Nematology?

N.A. Cobb Signup and view all the answers

What was the significant finding by H.O. Holmes in 1929 concerning viruses?

He measured the infectivity of viruses through tissue lesions. Signup and view all the answers

What disease is caused by the potato spindle tuber viroid (PSTVd)?

Potato spindle tuber disease Signup and view all the answers

Which of the following diseases is associated with prions?

Mad Cow disease Signup and view all the answers

How did Needham contribute to the study of plant diseases?

He was the first to report the association of a nematode with plant disease. Signup and view all the answers

What arrangement is characteristic of Sarcina bacteria?

Packets of eight cells Signup and view all the answers

Which structure is the main component of bacterial flagella?

Flagellin Signup and view all the answers

What type of flagellation do Pseudomonas species exhibit?

Amphitrichous Signup and view all the answers

What defines a peritrichous arrangement of flagella?

Flagella surround the entire cell Signup and view all the answers

Which component protects the bacterial cell and defines its shape?

Cell wall Signup and view all the answers

What type of arrangement do bacilli exhibit in a palisade formation?

Four bacilli stacked vertically Signup and view all the answers

Which bacterial group is characterized by the absence of flagella?

Atrichous Signup and view all the answers

What is the complex polymer that forms the bacterial cell wall?

Peptidoglycan Signup and view all the answers

What was the primary finding reported by Atkinson regarding the relationship between fungus and nematodes?

Fusarium wilt of cotton was more severe in the presence of nematodes. Signup and view all the answers

Which protozoan disease did Woronin study, and what was its causative agent?

Club root of cabbage caused by Plasmodiophora brassicae. Signup and view all the answers

Which chemical control method was first recommended by Prevost for wheat diseases?

Copper sulfate for seed treatment. Signup and view all the answers

What was the significance of the findings from the studies conducted by Carter in 1943?

Discovery of the nematicidal properties of DD (Dichloropropene dichloropropane). Signup and view all the answers

Which organism is responsible for sleeping sickness in humans, particularly in Africa?

Trypanosoma. Signup and view all the answers

Which of the following was introduced as the first systemic fungicide effective against higher fungi?

Plantvax (Oxy Carboxin). Signup and view all the answers

What contribution did Lafonte make to the understanding of protozoan diseases?

Identified causal agents in laticiferous plants. Signup and view all the answers

Which statement accurately reflects the issues related to Koch's postulates in protozoan studies?

Koch's postulates were not proved due to the obligate nature of protozoans. Signup and view all the answers

Study Notes

Plant Pathology Extended Syllabus

Introduction to plant pathology, scope, and objectives
Significance and economic importance of plant diseases (e.g., late blight of potato, coffee rust)
Historical overview of plant pathology, including significant contributors.
Definitions and concepts of plant pathology (pathogenesis, disease triangle, tetrahedron)
Classification of plant diseases based on etiology, affected parts, distribution, crops, inoculum source, and symptoms
General symptoms of various plant diseases
Important plant pathogenic organisms (fungi, bacteria, viruses, nematodes)
Detailed characteristics of fungi, including somatic structures, types of fungal thalli, fungal tissues, and reproduction (asexual and sexual).
Detailed characters and important examples of fungal groups like Peronosporales, Erysiphales, Uredinales, and Ustilaginales.
Detailed morphological characters and reproduction, classification of bacteria along with symptoms produced
Features of plant viruses, replication, symptoms, and classifications
General morphology, characteristics, symptoms, and classification of plant parasitic nematodes, viruses, algae, and Protozoa
Diseases caused by abiotic factors (black heart of potato, Khaira of rice)
Liberation/ dispersal and survival of plant pathogens
Pathogenesis: Role of enzymes, toxins, and growth regulators
Plant defense mechanisms (structural, biochemical)
Epidemiology: Factors affecting disease development in plants.
Key reference books (e.g., Agrios, Principles of Plant Pathology)

Practical Experiments

Microscopy procedures, collection & disease specimens
Study of symptoms and diagnosis of plant diseases, fungi and bacteria identification
Preparation and techniques for plant culture media, sterilization, and disinfecting
Methods of inoculation and proof of Koch's postulates
Morphology and staining techniques for bacteria
Morphology and methods of transmission for viruses/nematodes
Extraction techniques for nematodes, phanerogamic parasites, fungicides; and their formulations
Calculation of spray concentration; insecticide evaluation
Methods for pesticide use and their safe practices

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Description

Test your knowledge on plant diseases, their causes, and characteristics in this engaging quiz. Explore various pathogens, their effects on plants, and the environmental conditions that facilitate disease development. Perfect for students and enthusiasts of plant biology.