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

In sheep, break down of enzyme resistant cellulose is done by_______.

  1. aerobic bacteria

  2. protozoa

  3. anaerobic bacteria

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In sheep and other ruminants, protozoa living in the rumen are primarily responsible for breaking down cellulose through fermentation. While anaerobic bacteria also contribute, protozoa are the main agents for digesting enzyme-resistant cellulose. Aerobic bacteria cannot survive in the anaerobic environment of the rumen.

Multiple choice

Which one of the following ‘fungi’ is used as a bio-weapon in warfare?

  1. Rhizwus

  2. Pentadiplandra

  3. Aspergillus

  4. Fusarium

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

Harmful chemicals in the form of toxins are called bio-weapons, produced by various species of Fusarium, Myrotecium, Trichoderma, Cephalosporium, etc. The chemicals cause very dangerous diseases to human beings such as bloody diarrhea, weight loss, nervous disorders, cardiovascular alterations, immune-depression, hemostatic derangements, skin toxicity, decreased reproductive capacity and bone marrow damage. Hence, Fusarium is used as a bio-weapon in warfare.

Multiple choice

The vegetative plant body of Rhizopus is called:

  1. mycelium

  2. gametangia

  3. sporangiophore

  4. columella
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rhizopus is a fungus, and the vegetative body of fungi is called mycelium - a network of thread-like hyphae. Gametangia are reproductive structures, sporangiophore bears spores, and columella is a sterile structure inside the sporangium. Mycelium is the correct answer for the vegetative plant body.