Plant Pathology 04 — Agri Master Mind
The first antibiotic penecillin was discovered by -
- Alexander Flaming
- L. Pasteur
- Edward jenner
- John Needham
Virus infecting a bacterium is called -
- Bacteriophage
- Viron
- Viroid
- All of the above
Agar-Agar is byproduct of -
- Algae
- Fungi
- Plant
- Bacteria
Crown gall disease of various plants is caused by:
- Erwinia
- Agrobacterium
- Corynebacterium
- Spiroplasma
Puccinia graminis is an example of:
- Bacteria
- Fungi
- Mycoplasma
- Algae
Hair like appendages present. on the surface of most of Gram negative bacteria which helps them to attach to natural substrate are called:
- Fimbriae
- Flagella
- Hypha
- None of the above
Barberry is the alternate host for.......
- Smut of wheat
- Powdery mildew of Pea
- Rusts of Wheat
- None of the above
Mycoplasma differs from bacteria in the absence of -
- Cell membrane
- DNA
- Cell wall
- Ribosomes
Lichen is an association between -
- Algae and Fungus
- bacterium and fungus
- Fungus and virus
- fungus and nematode
One of the following which will not grow on artificial nutrient medium-
- Mycoplasma
- Yeast
- Bacillus
- TYMV
Who undertook extensive studies on anthrax bacillus?
- Robert Koch
- Pasteur
- Waksman
- lachman
The ability to cause disease in various plants or animals or even micro-organisms is called -
- Virulence
- Pathogenicity
- pathogenesis
- Antibiosis
If a wheat field is inoculated with bacterium rhizobium, the soil will become rich in-
- Nitrogen
- Potassium
- phosphorus
- None of the above
Pure culture of bacteria were obtained by -
- Joseph lister
- Louis Pasteur
- Robert koch
- Eli Metchini koff
Who coined the term 'Viroid' ?
- Prusiner et al.
- D'Herelle et al.
- Diener et al.
- Sinsheimer
Bacteriophages are -
- Bacteria that attacks bacteria
- Bacteria that attacks fungi
- Bacteria that attacks virus
- Viruses that attacks bacteria
Cells of Mycoplasma are sensitive to -
- Penicillin
- Vancomycin
- Tetracycline
- Streptomycin
Which one of the following is not a disease of mungbean?
- Yellow mosaic
- Tungro
- Powdery mildew
- Cercospora leaf spot
Which one of the following disease is caused by phytoplasma?
- White rust of mustard
- Green ear of bajra
- Phyllody of sesamum
- Bunt of wheat
In early blight of tomato, symptoms first appear on -
- Stem
- Fruits
- Newly formed leaves
- Older leaves
Sexual state of Phytophthora infestans consists of -
- Oospores
- Ascospores
- Sclerotia
- Zygospores
Roguing of plants is not effective in management of -
- Viral disease
- Bacterial disease
- Phytoplasmal diseases
- Non-parasitic diseases
How much quantity of Agrimycin-100 is required to prepare ten litres of spray solution of 100 ppm concentration?
- 0.01 g.
- 0.1 g
- 1 g
- 10 g
The diseases of which of the following groups are controlled by tridemorph fungicide?
- Powdery mildew
- Downy mildew
- Wilts
- Leaf curls
Acervuli are produced on infected host surface by the fungus causing?
- Die-back of chillies
- Early blight of tomato
- Aonla rust
- Purple blotch of onion
Sporangia cause secondary infection in-
- Anthracnose of grapes
- Powdery mildew of ber
- Late blight of potato
- Leaf spot of turmeric
Under anaerobic condition of certain soils the population of …...are dominated.
- Bacteria
- Fungi
- Actinomycetes
- None of these
Sun light essential for ...........soil microorganisms.
- Bacteria
- Fungi
- Algae
- None of these
Black leg or soft rot of potato is caused by -
- Bacteria
- Fungi
- Phytoplasma
- None of these
Which was firstly discovered antibiotic in world…
- Streptomycine
- Tetracycline
- Penicillin
- Teramycine
Who discovered streptomycin (antibiotic)....
- Alexander Fleming
- Selman Waksman
- Albert Schatz
- Both b & c
The........ is refers to the total above ground portions of plants as habitat for microorganisms.
- Phylloplane
- Phyllosphere
- Rhyzosphere
- None of these
Example of host specific or host selective toxins is/are
- T-Toxin
- HC-Toxin
- Victorin
- All of these
The example of mycotoxins which is caused human and animal illness is......
- Aflatoxin
- Fumonisins
- Ergotamine
- All of these
All the powdery mildew fungus are..........in nature
- Facultative parasite
- Saprophyte parasite
- Obligate parasite
- All of these
Appearance of tumors on tubers and dirty cauliflower like outgrowth on infected potato tuberous is characteristics symptoms of
- Soft rot of potato
- Wart disease of potato
- Black heart of potato
- None of these
Fungus, Fusarium oxysporium produces..
- Micro conidia
- Macro conidia
- Chlamydospores
- All of these
Browning of fruits is due to
- Mo deficiency
- B deficiency
- Ca deficiency
- K deficiency
Multiplication of bacteria is chiefly done by.....
- Binary fussion
- Budding
- Fragmentation
- Parasexually
Which is the bacterial disease of rice........
- Brown leaf spot
- Leaf blight
- Blast
- False smut
Causal organism of karnal bunt disease of wheat is….(vvi)
- Puccinia recondita
- Ustilago nuda
- Nevossia indica
- All of above
At the high soil moisture level which fungi is more prevalent to cause disease-
- Phytophthora
- Sclerotium
- Pythium
- All of these
National Virology Institute is situated at........
- New Delhi
- Bangalore
- Hyderabad
- Pune
Vector of cucumber mosaic virus (CMV) disease is….
- Thrips
- Aphids
- White flies
- Jassids
Which is the example of fungicide.
- Kelthane
- Rogor
- Confidor
- Karathane
Domestic quarantine is adopted against
- Scab disease of potato
- Wart disease of potato
- Golden nematode of potato
- b & c both
Rust or white blister of crucifers is caused by...
- Puccinia spp.
- Peranospora spp
- Albugo candida
- Phytophthora
Who is known as father of Wheat Rust disease in India?
- Anton De Bary
- Mundkur
- K.
- Mehta
Bengal famine (1943) is caused due to (vvi)
- Pyricularia oryzae
- Xanthomanas oryzac
- Helminthosporium oryzae
- Urocysts spp.
Iris famine (1845) is caused by fungus........
- Alternaria solani
- Phytophthora infestans
- Colletotrichum falcutum
- Helminthosporum oryzae