Biology

Microbes and Plant Diseases

1,118 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

Which among the following plants and diseases associated with them is not matched properly?

  1. Bunchy top - Banana

  2. Tundu - Wheat

  3. Witches broom - Rice

  4. Red Rot - Sugarcane

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bunchy top affects banana, Tundu disease affects wheat, and Red Rot affects sugarcane - all correctly matched. However, Witches' Broom disease primarily affects plants like cassava, cocoa, and legumes, not rice. Rice is affected by diseases like blast, bacterial blight, and sheath blight.

Multiple choice

Late blight of potato is caused by:

  1. alternaria solani

  2. phytophthora infestans

  3. helminthosporium oryzae

  4. puccinia graminis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Phytophthora infestans is an oomycete (water mold) pathogen that causes late blight of potato. This disease was responsible for the Irish Potato Famine in the 1840s. The other options are: Alternaria solani (causes early blight), Helminthosporium oryzae (rice brown spot pathogen), and Puccinia graminis (stem rust of cereals).

Multiple choice

Largest class of lichenised fungi is

  1. Saccharomycetes

  2. Pucciniomycetes

  3. Orbiliomycetes

  4. Lecanoromycetes

  5. Geoglossaceae
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lecanoromycetes is the largest class of lichenised fungi. It belongs to the subphylum Pezizomycotina in the phylum Ascomycota.The asci (spore-bearing cells) of the Lecanoromycetes most often release spores by rostrate dehiscence.

Multiple choice

Which of the following mushrooms is edible?

  1. Beefsteak fungus

  2. Funeral Bell

  3. False morels

  4. White saddle

  5. Blackening Waxcap
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Beefsteak fungus is large, dark-red and slimy on top, and pale-yellow underneath. Its flesh resembles a raw steak (hence, the common name) and when the fungus is young, it oozes red droplets that look like blood. It is edible.

Multiple choice

The diseases caused by Bacillus subtilis and Colletotrichum graminicola in maize, respectively are

  1. black kernel rot disease, holcus spot disease

  2. seed rot-seedling blight, anthracnose leaf blight

  3. seed rot-seedling blight, anthracnose leaf blight

  4. black bundle disease, black kernel rot

  5. stewart’s disease, holcus spot disease
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Seed rot-seedling blight is caused by Bacillus subtilis while anthracnose leaf blight is caused by Colletotrichum graminicola in maize.