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 fungi is heteroecious?

  1. Puccinia

  2. Ustilago

  3. Rhizopus

  4. Yeast

  5. Mucor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is a heteroceous fungi genus that needs two host, one is primary and another secondary. Both the primary host and an alternate unrelated host are required for the parasite to complete the life cycle.

Multiple choice

Match the following:

a. Stachybotrys atra 1. Indoor mold
b. Aspergillus niger 2. Textile
c. Bipolaris 3. Black mold
d. Ulocladium 4. Food decaying

  1. a - 3, b - 4, c - 1, d - 2

  2. a - 4, b - 3, c - 2, d - 1

  3. a - 3, b - 1, c - 4, d - 2

  4. a - 1 , b - 4, c - 3, d - 2

  5. a - 2, b - 3, c - 4, d - 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stachybotrys atra is a black mold, Aspergillus niger is an indoor mold, Bipolaris decays foods, and Ulocladium is related to textiles.

Multiple choice

What is the infection of Zeis gland called?

  1. Hordeolum

  2. Chalazion

  3. Blepharitis

  4. Ectropion

  5. Ablepharia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hordeolum or styes is an infection of the sebaceous glands of zeis usually caused by Staphylococcus aureus bacteria. It is characterized by an acute onset of symptoms, and it looks like a red bump placed underneath the eyelid. The main symptoms of styes include pain, redness of the eyelid and sometimes swollen eyelids.

Multiple choice

Which of the following fungi is used in production of antibiotics?

In our daily routine, fungi have both positive and negative impacts. There are number of beneficial roles of fungi in different aspects of our life such as food, scientific uses, medicines, agriculture, commercial products, etc.

  1. S. cerevisae

  2. Mycorrhiza

  3. Streptomycin

  4. Mushrooms

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

Streptomycin is used in production of antibiotic drugs,  which can not be taken orally. It must be used as intracellular injection on a regular basis.

Multiple choice

Which of the following fungi cause brain tumor?

In our daily routine, fungi have both positive and negative impacts. There are number of beneficial roles of fungi in different aspects of our life such as food, scientific uses, medicines, agriculture, commercial products, etc.

  1. Amanita

  2. Alternaria solani

  3. Albugo candida

  4. Cryptococcus neoformans

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

Cryptococcus neoformans causes different human diseases such as meningitis and brain tumor which is encapsulated yeast, susceptible both within plants’ animals’ body. Sometimes it may found in excrement of pigeon.

Multiple choice

Which of the following bacteria causes leaf blight of rice?

Economic importance of bacteria also includes its harmful activities. Around 90% infections in humans are caused by bacteria. They equally affect green plants including their different parts.

  1. Xanthomonas citri

  2. Xanthomonas oryzae

  3. Salmonella

  4. Saprophytic bacterium

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

Xanthomonas oryzae, species of proteobacteria is responsible for causing leaf blight of rice. Rice is its important host.

Multiple choice

Match the following items: Column-I Column-II

  1. Helminthosporium oryzae A. Early blight of potato
  2. Puccinia graminis B. Late blight diseases
  3. Alternaria solani C. Stem rot diseases
  4. Phytiphtoria infestans D. Brown rust
  5. Macrophomina phaseoli E. Black rust

  1. 1 - A, 2 - B, 3 - C, 4 - D, 5 - E

  2. 1 - E, 2 - A, 3 - C, 4 - D, 5 - B

  3. 1 - D, 2 - E, 3 - A, 4 - B, 5 - C

  4. 1 - B, 2 - C, 3 - D, 4 - A, 5 - E

  5. 1 - C, 2 - D, 3 - B, 4 - E, 5 - A
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Helminthosporium oryzae is a fungus causes brown rust. All species of Puccinia graminis obligate plant pathogen and causes black rust. Alternaria solani is a harmful fungus causes early blight of potato. Phytiphtoria infestans is an oomycete which causes late blight diseases. Macrophomina phaseoli botryosphaeriaceae fungus causes Stem rot diseases

Multiple choice

Which of the following food crop diseases are caused by a virus?

  1. Citrus canker and rice stripe necrosis

  2. Cassava mosaic disease and rice stripe necrosis

  3. Potato late blight and citrus canker

  4. Rice stripe necrosis and potato late blight

  5. Potato late blight and cassava mosaic disease
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cassava mosaic disease is caused by Begomovirus. Rice stripe necrosis rice is caused by stripe necrosis virus rice.

Multiple choice

Dandruff is caused by

  1. Candida albicans

  2. Corynebacterium acnes

  3. Malassezia furfur

  4. Staphylococcus aureus

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

Normal habitat of Malassezia furfur in human body is scalp. It causes dandruff.