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

Psychoactive substances affect the brain functioning, causing changes in behaviour, mood and consciousness. Which among the following is a psychoactive basidiomycete fungus?

  1. Typhula

  2. Fly agaric

  3. Beefsteak fungus

  4. Jack-o'-lantern mushroom

  5. Destroying angel
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fly agaric is a mushroom and psychoactive basidiomycete fungus.The quintessential toadstool, it is a large white-gilled, white-spotted, usually red mushroom, one of the most recognisable and widely encountered in popular culture.

Multiple choice

Which among the following fungi was the causative agent of Great Irish Famine?

  1. Ustilago

  2. Rhizoctonia

  3. Xanthomonas

  4. Pythium

  5. Phytophthora
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Phytophthora spp. are mostly pathogens of dicotyledons, and are relatively host-specific parasites. Many species of Phytophthora are plant pathogens of considerable economic importance. Phytophthora infestans was the infective agent of the potato blight that caused the Great Irish Famine

Multiple choice

The species of which among the following fungal orders produces gelatinous basidiocarps on dead wood?

  1. Agaricales

  2. Sebacinales

  3. Auriculariales

  4. Dacrymycetes

  5. Tremellales
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The majority of species within the Auriculariales produce gelatinous basidiocarps (fruit bodies) on dead wood. In some these are conspicuous and may be ear-shaped, button-shaped, lobed, or effused. Their hymenophores (spore-bearing surfaces) may be smooth, warted, veined, toothed (as in the genus Pseudohydnum), or poroid (as in the genera Elmerina and Protomerulius).

Multiple choice

Which among the following classes of fungi contains 5 orders and 21 families?

  1. Cystobasidiomycetes

  2. Pucciniomycetes

  3. Classiculomycetes

  4. Atractiellomycetes

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

The Pucciniomycetes (formerly known as the Urediniomycetes) are a class of fungi in the Pucciniomycotina subdivision of the Basidiomycota. The class contains 5 orders, 21 families, 190 genera, and 8016 species. It includes several important plant pathogens causing forms of fungal rust.

Multiple choice

What is VAM?

  1. Ectomycorrhiza fungus

  2. Endomycorrrhiza fungus

  3. Ectoparasite

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

VAM is an endomycorrhizal fungus.

Multiple choice

Which of the following thermally dimorphic fungi causes a disease known as Cave disease, Darling's disease or Ohio valley disease?

  1. Blastomyces dermatitidis

  2. Sporothrix schenckii

  3. Histoplasma capsulatum

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

Histoplasma capsulatum fungus causes histoplasmosis. It is also known as Cave disease, Darling's disease or Ohio valley disease. The disease affects primarily the lungs and is common among AIDS patients due to their suppressed immunity.