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

Mushroom is a

  1. saprophyte

  2. facultative parasite

  3. autotroph

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

Mushroom is a saprophyte, which obtains nutrients from dead organic matter.

Multiple choice

Which of the following is not a fungal plant disease?

  1. Citrus canker

  2. Potato late blight

  3. Red rot disease of sugarcane

  4. Corn smut

  5. Wheat leaf rust
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Citrus canker is a disease affecting citrus species that is caused by the bacterium Xanthomonas axonopodis.

Multiple choice

Which of the following is a set of imperfect fungi (deuteromycetes)?

  1. Mucor, Rhizopus and Albugo

  2. Aspergillus, Claviceps and Neurospora

  3. Agaricus, Ustilago and Puccinia

  4. Alternaria, Colletotrichum and Trichoderma

  5. Mucor, Claviceps and Puccinia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deuteromycetes are commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known. Some examples are Alternaria, Colletotrichum and Trichoderma.

Multiple choice

Which of the following diseases is caused by fungi in animals?

  1. Rust of wheat

  2. Citrus canker

  3. Yellow vein mosaic

  4. Foot and mouth disease

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

 Rust of wheat is a plant disease caused by bacteria. Yellow vein mosaic of bhindi is again a plant disease but caused by a virus. Foot and mouth disease is a viral disease, which affects cattle.Citrus canker is the disease for which the causal organism is fungi. 

Multiple choice

Plant decomposers are

  1. monera and fungi

  2. fungi and plants

  3. protista and animalia

  4. animalia and monera
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Decomposers are organisms such as bacteria & fungi that breakdown the organic matter in the dead bodies of plant and animals.

Multiple choice

Red rot disease in plants occurs in

  1. leaf tip

  2. leaf margins

  3. mid rib

  4. whole leaf

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

Tiny reddish lesions occur on the upper surface of the lamina. Minute red spots occur on the upper surface of the midrib in both the directions. Later on, these become straw colored in the center with the development of black acervuli and dark reddish brown margins.