Skip to main content

Fastidious Vascular Pathogens

1. When were Mycoplasma-like organisms (MLOs) discovered as causal agents of dwarf mulberry, potato witches' broom and Aster yellows?

A. 1967

B. 1976

C. 1982

D. 1971


2. Which antibiotic was found to have an effect on the symptoms of the diseases caused by MLOs?

A. Penicillin

B. Tetracycline

C. Amoxicillin

D. Ciprofloxacin


3. What recognition did Doi, Ishi and their colleagues receive for their contribution to the study of MLOs?

A. Nobel Prize

B. Citation from International Organization of Mycoplasmology

C. Best Paper Award

D. Research Grant


4. Who cultured the MLO causing citrus stubborn in 1971?

A. Sagglio et al in France and Fudl-Allah et al. in USA

B. Doi et al.

C. Ishi et al.

D. Davis and Worley


5. What trivial name was coined for the MLO causing citrus stubborn by Davis and Worley in 1973?

A. Phytoplasma

B. Spiroplasma

C. Phytomonas

D. Mycoplasma


6. What are non-cultivable MLOs that are not helical in thick sections of diseased tissues called?

A. Candidatus genus

B. Spiroplasma

C. Phytoplasma

D. Mycoplasma


7. What is the status given to phytoplasma as a genus?

A. Candidatus genus (hence not italicized)

B. Italicized genus

C. Unclassified genus

D. Species


8. What was the next addition to the list of plant pathogens after MLOs?

A. Fungi

B. Bacteria

C. Viruses

D. Flagellated protozoans


9. Which genus do phloem-inhabiting protozoan plant pathogens belong to?

A. Phytomonas

B. Phytoplasma

C. Mycoplasma

D. Candidatus genus


10. What are organisms inhabiting the phloem or/and xylem tissues as special 'niche' designated as?

A. Fastidious Vascular Pathogens

B. Candidatus genus

C. Spiroplasma

D. Phytoplasma


Answers: 

1. A 

2. B 

3. B 

4. A 

5. B 

6. C 

7. A 

8. D 

9. A 

10. A

Comments

Post a Comment

Popular posts from this blog

Initial history of plant pathology

1. Who is known as ‘The father of botany’? A. Antonie van Leeuwenhoek B. Micheli C. Theophrastus D. Linnaeus 2. Who invented the microscope in the 17th century? A. Antonie van Leeuwenhoek B. Micheli C. Theophrastus D. Linnaeus 3. Who discovered bacteria in 1617? A. Antonie van Leeuwenhoek B. Micheli C. Theophrastus D. Linnaeus 4. Who made an extensive study of fungi and their reproductive structures in 1729? A. Antonie van Leeuwenhoek B. Micheli C. Theophrastus D. Linnaeus 5. Who gave the first experimental proof that fungi were autonomous organisms which produced seed-like bodies? A. Antonie van Leeuwenhoek B. Micheli C. Theophrastus D. Linnaeus 6. Who gave the binomial system of nomenclature? A. Antonie van Leeuwenhoek B. Micheli C. Theophrastus D. Linnaeus 7. Who applied the binomial system of nomenclature to fungi and gave firm footing to the taxonomy of fungi? A. Antonie van Leeuwenhoek B. Micheli C. Theophrastus D. Linnaeus's students Persoon and Fries 8. Who experimentally p...
Post a Comment
Read more

Phytobacteriology

1. Which type of plant pathogenic bacteria is rod-shaped and lacks flagella? A) Atrichous B) Peritrichous C) Agrobacterium D) Rickettsia Like Organisms 2. What is the name of the rod-shaped plant pathogenic bacteria with flagella present on the whole periphery/surface? A) Atrichous B) Peritrichous C) Erwinia spp. D) Agrobacterium 3. Which type of bacteria is sensitive to antibiotics such as tetracycline and penicillin? A) Atrichous B) Peritrichous C) Rickettsia Like Organisms D) Agrobacterium 4. Which type of bacteria is sensitive to high temperature? A) Atrichous B) Peritrichous C) Rickettsia Like Organisms D) Agrobacterium 5. Which type of plant pathogenic bacteria is commonly associated with crown gall disease? A) Atrichous B) Peritrichous C) Erwinia spp. D) Agrobacterium Answers:  1. A) Atrichous  2. B) Peritrichous  3. C) Rickettsia Like Organisms  4. C) Rickettsia Like Organisms  5. D) Agrobacterium
Post a Comment
Read more

Ecology of Soil-Borne Plant Pathogens

1. Who discovered that the root disease fungus Phymatotrichum omnivorum could not grow in the soil although it infected the finest rootlets? A. Tabenhaus and Ezekiel B. Waksman C. Reinking and Manns D. Garrett 2. Who emphasized the important role that fungi play in the economy of the soil? A. Tabenhaus and Ezekiel B. Waksman C. Reinking and Manns D. Garrett 3. Who observed two types of soil fungi, soil inhabitants and the soil invaders? A. Tabenhaus and Ezekiel B. Waksman C. Reinking and Manns D. Garrett 4. Who renamed the soil invaders as root inhabiting fungi and distinguished the two groups by their "competitive saprophytic ability"? A. Tabenhaus and Ezekiel B. Waksman C. Reinking and Manns D. Garrett 5. Who consolidated the concept of inoculum potential? A. Tabenhaus and Ezekiel B. Waksman C. Reinking and Manns D. Garrett Answers: 1. A 2. B 3. C 4. D 5. D
Post a Comment
Read more