Biology

Microbes and Plant Diseases

1,145 Questions

Microbes and plant diseases examine the role of fungi, bacteria, and viruses in causing infections in plants and humans. Topics cover symbiotic associations like mycorrhiza, fungal structures, and specific agricultural pathogens. Practice these biology questions to master microbiology concepts for upcoming competitive examinations.

Fungal associationsPlant pathogensMicrobial structuresBacterial infections

Microbes and Plant Diseases Questions

Multiple choice

The fungus causing coffee rust is

  1. autoecious

  2. dioecious

  3. heteroecious

  4. polymorphic

  5. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The fungus that causes coffee rust is autoecious.

Multiple choice

What causes rotten-neck disease of rice?

  1. Helminthosporium

  2. Xanthomonas oryzae

  3. Fusarium

  4. Pyricularia oryzae

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rotten-neck disease of rice is caused by pyricularia oryzae.

Multiple choice

Which of the following is not a rice disease?

  1. Bacterial blight (Xanthomonas oryzae)

  2. Bacterial leaf streak (Xanthomonas oryzae)

  3. Foot rot (Erwinia chrysanthemi)

  4. Grain rot (Burkholderia glumae)

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Since all the diseases are related to rice plant, so this is the correct answer.

Multiple choice

Which of the following is not correctly matched?

  1. Colletotrichum gloeosporioides - Causes coffee disease

  2. Erysiphe cichoracearum - Causes mint disease

  3. Fusicladium pisicola - Causes mango disease

  4. Erwinia cypripedii - Causes papaya disease

  5. Pythium paroecandrum - Causes carrot disease
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This pair is incorrectly matched as Fusicladium pisicola does not cause mango disease, it causes pea disease.

Multiple choice

Fungi are simple non-green plants that are not photosynthetic. Which of the following fungi draw their nutrients from the dead remains of plants and animals?

a. Mucor b. Puccinia c. Albugo d. Penicillium

  1. Only a and b

  2. Only b and d

  3. Only a and c

  4. Only a and d

  5. Only b and c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. Mucor and penicillium draw their nutrients from the dead remains of plants and animals. They are called decomposers.

Multiple choice

_______ is not caused by a fungus.

  1. Gumming disease

  2. Black stripe

  3. Pineapple disease

  4. Rind disease

  5. Black rot
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gumming disease of sugarcane is caused by bacterium Xanthomonas axonopodis.

Multiple choice

_________ is caused by a virus.

  1. False eyespot of wheat

  2. Wheat yellow leaf

  3. Pink seed of wheat

  4. Downy mildew of wheat

  5. Ergot of wheat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Wheat yellow leaf virus is a wheat, barley, rye and oat pathogenic virus of the family Closteroviridae. 

Multiple choice

White mold of pepper is caused by

  1. Botrytis cinerea

  2. Sclerotinia sclerotiorum

  3. Peronospora tabacina

  4. Stemphylium solani

  5. Macrophomina phaseolina
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White mold of pepper is caused by Sclerotinia sclerotiorum.

Multiple choice

Northern corn leaf blight is caused by

  1. Puccinia sorghi

  2. Bipolaris maydis

  3. Exserohilum turcicum

  4. Puccinia polysora

  5. Cercospora zeae-maydis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Northern corn leaf blight is caused by fungus Exserohilum turcicum.