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
  1. Puccinia asparagi

  2. Puccinia graminis

  3. Puccinia mariae-wilsoniae

  4. Puccinia poarum

  5. Puccinia striiformi

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

Puccinia asparagi is the causative agent of asparagus rust. It is an autoecious fungus, meaning that all stages of its life cycle – pyciniospores, aeciospores and teliospores develop upon the same host plant.

Multiple choice
  1. Rust

  2. Anthracnose

  3. Pine pitch canker

  4. Mildew

  5. Armillaria root rot

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

Pine trees are susceptible to pine pitch canker. Pine pitch canker first kills the tips of branches, then spreads down the entire length of branches, and ultimately it can kill the whole tree. Infected trees die because the fungus thrives inside the tree's vascular tissue and blocks its water supply. The fungus is spread through beetles that attack pine cones.

Multiple choice
  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only R and S

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

Yes, both are caused by fungus. Ergot of Rye is a plant disease that is caused by the fungus Claviceps purpurea. Powdery mildew of cucurbits is caused by two fungus: Sphaerotheca fuliginea and Erysiphe cichoracearum.

Multiple choice
  1. Rhizopus oryzae

  2. Saksenaea vasiformis

  3. Aspergillus fumigatus

  4. Beauveria bassiana

  5. Fusarium

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

This fungi is usually as a saprophytic contaminant. World-wide, known as an insect parasite. Sympodial development of single-celled conidia on a narrow geniculate or zig-zag rachis emanating from a flask-shaped conidiophore.

Multiple choice
  1. Absidia corymbifera

  2. Conidiobolus coronatus

  3. Cunninghamella bertholletiae

  4. Mucor

  5. Rhizomucor pusillus

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

It is a common human pathogen causing pulmonary, rhinocerebral, disseminated, CNS  zygomycosis. It is a small pyriform shaped sporangia with a characteristic conical shaped columellae and pronounced apophysis.

Multiple choice
  1. Candidiasis

  2. Chronic Candida onychomycosis

  3. Pityriasis folliculitis

  4. Paronychia

  5. Dermatophytosis

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

Dermatophytosis of the scalp, glabrous skin, and nails is caused by dermatophytes which have the ability to utilise keratin as a nutrient source. No living tissue is invaded, the keratinised stratum corneum is simply colonised.