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 is an example of a dimorphic fungus?

  1. Aspergillus fumigatus

  2. Candida albicans

  3. Histoplasma capsulatum

  4. Rhizopus stolonifer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Histoplasma capsulatum is a dimorphic fungus that can exist in both mycelial and yeast forms.

Multiple choice

What is the term for a fungal infection of the skin?

  1. Dermatophytosis

  2. Candidiasis

  3. Aspergillosis

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

Dermatophytosis is a fungal infection of the skin caused by dermatophytes.

Multiple choice

Which of the following is an example of a pathogenic yeast?

  1. Saccharomyces cerevisiae

  2. Candida albicans

  3. Cryptococcus neoformans

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

Candida albicans is a pathogenic yeast that can cause infections in humans.

Multiple choice

Which of the following is an example of a mycorrhizal fungus?

  1. Amanita muscaria

  2. Boletus edulis

  3. Aspergillus fumigatus

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

Boletus edulis is an example of a mycorrhizal fungus that forms symbiotic relationships with plants.

Multiple choice

Which of the following is an example of a fungal toxin?

  1. Aflatoxin

  2. Ochratoxin A

  3. Patulin

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

Aflatoxin is an example of a fungal toxin produced by certain species of Aspergillus.

Multiple choice

Which of the following is an example of a fungal enzyme?

  1. Cellulase

  2. Amylase

  3. Lipase

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

Cellulase is an example of a fungal enzyme that breaks down cellulose, a major component of plant cell walls.

Multiple choice

What is the largest group of fungi?

  1. Ascomycetes

  2. Basidiomycetes

  3. Zygomycetes

  4. Deuteromycetes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deuteromycetes, also known as imperfect fungi, is the largest group of fungi, containing species that lack a known sexual reproductive stage.

Multiple choice

Which microorganism is responsible for causing athlete's foot?

  1. Trichophyton rubrum

  2. Candida albicans

  3. Staphylococcus aureus

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

Trichophyton rubrum is a fungus that commonly causes athlete's foot, a contagious skin infection.

Multiple choice

Which lichen species is commonly used as a food source in some parts of the world?

  1. Cladonia rangiferina

  2. Xanthoria parietina

  3. Lobaria pulmonaria

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

Cladonia rangiferina, also known as 'reindeer lichen,' is a widely distributed lichen species that serves as a primary food source for reindeer and caribou in Arctic and subarctic regions.

Multiple choice

What is the primary mechanism of action of fungicides?

  1. Inhibition of spore germination

  2. Disruption of cell wall synthesis

  3. Interference with DNA replication

  4. Blocking of nutrient uptake
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fungicides often target and inhibit the germination of fungal spores, preventing the establishment of fungal infections.

Multiple choice

Which species of fungus is found in the Sundarbans?

  1. Mushroom

  2. Yeast

  3. Mold

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

The mushroom is a fungus species found in the Sundarbans.

Multiple choice

What is the primary cause of mold growth on bread?

  1. Bacteria

  2. Yeast

  3. Mold spores

  4. Viruses
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mold growth on bread is primarily caused by mold spores present in the air or on the bread's surface. These spores germinate and grow under favorable conditions, such as high humidity and temperature, consuming the bread's nutrients and producing visible mold colonies.

Multiple choice

Which pest is known for causing extensive damage to tomato plants, resulting in irregular holes in leaves and fruits?

  1. Aphids

  2. Whiteflies

  3. Tomato hornworm

  4. Spider mites
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The tomato hornworm is a large, green caterpillar that feeds on tomato plants, causing significant damage to leaves and fruits.

Multiple choice

What is the common name for the fungal disease that causes powdery mildew on cucurbit crops, such as cucumbers and melons?

  1. Downy mildew

  2. Fusarium wilt

  3. Powdery mildew

  4. Botrytis blight
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Powdery mildew is a fungal disease that forms a white, powdery growth on the leaves of cucurbit plants, affecting their photosynthesis and overall health.

Multiple choice

Which bacterial disease is responsible for causing soft rot in vegetables, leading to a slimy, foul-smelling decay?

  1. Bacterial spot

  2. Erwinia carotovora

  3. Fire blight

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

Erwinia carotovora is a bacterium that causes soft rot in vegetables, resulting in a rapid decay characterized by a slimy, foul-smelling rot.