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

Which of the following statements is/are not true about fungal diseases of coffee?

  1. Red blister disease of coffee is caused by Fusarium solani.
  2. Phoma costaricensis causes thread blight disease.
  3. Gibberella xylarioides causes tracheomycosis.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Red blister disease of coffee is caused by Cercospora coffeicola. Dry root rot disease of coffee is caused by Fusarium solani. Thread blight disease is caused by Corticium koleroga in coffee. Phoma costaricensis causes tip blast disease in coffee. Tracheomycosis is caused by the fungus Gibberella xylarioides in coffee.

Multiple choice

Match the diseases in List-A with causing fungal pathogens in List-B and select the correct answer using the codes given below ||| |---|---| |List-A |List-B| |A. Cottony snow mold of wheat|1. Sclerotium rolfsii| |B. White leaf spot of crucifer|2. Coprinus psychromorbidus| |C. Hull rot of almond|3. Rhizopus sp.| |D. Southern blight of cotton|4. Pseudocercosporella capsellae|

  1. A - 2, B - 4, C - 3, D - 1

  2. A - 3, B - 1, C - 4, D - 2

  3. A - 2, B - 4, C - 1, D - 3

  4. A - 1, B - 3, C - 2, D - 4

  5. A - 2, B - 1, C - 3, D - 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cottony snow mold of wheat is caused by the fungus Coprinus psychromorbidus. White leaf spot of crucifer is caused by Pseudocercosporella capsellae. Hull rot disease of almond is mainly caused by Rhizopus sp. Southern blight of cotton is caused by the fungal pathogen Sclerotium rolfsii. Hence, the sequence of codes A - 2, B - 4, C - 3, D - 1 is correct.

Multiple choice

Full form of TMV is

  1. tomato mosaic virus

  2. tobacco mosaic virus

  3. tamarind mosaic virus

  4. tobacco microbe virus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

TMV is a well-known virus that infects tobacco plants. The correct expansion is Tobacco Mosaic Virus, named after the host plant and the mosaic pattern it creates on leaves.

Multiple choice

Black wart disease of potatoes is caused by

  1. synchytrium endobioticum

  2. phytophthora

  3. alternaria solani

  4. ustilago tritici

  5. albugo candida
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Black wart disease of potatoes is caused by Synchytrium endobioticum.

Multiple choice

______ is a species of fungi.

  1. Crow

  2. Yeast

  3. Virus

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

Yeast is a unicellular fungus used in baking and brewing. Unlike crows (animals), viruses (non-cellular), or bacteria (prokaryotes), yeast is a eukaryotic fungal organism. It reproduces by budding and is classified under Kingdom Fungi.

Multiple choice

Fire blight of pome fruits is caused by

  1. Cryphonectria parasitica

  2. Erwinia amylovora

  3. Cochliobolus heterostrophus

  4. Phytophthora parasitica
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Erwinia amylovora bacterium causes fire blight of pome fruits.