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
  1. Extrusomes

  2. Cryptomonad ejectosomes

  3. Chlorosome

  4. Carboxysomes

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

A Chlorosome is a photosynthetic antenna complex found in green sulfur bacteria (GSB) and some green filamentous anoxygenic phototrophs (FAP) (Chloroflexaceae, Oscillochloridaceae). They differ from other antenna complexes by their large size and lack of protein matrix supporting the photosynthetic pigments.

Multiple choice
  1. Lacto bacilli

  2. Mycobacterium bacilli

  3. Pox bacilli

  4. Candida Albicans

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

Lactobacilli are beneficial bacteria that naturally occur in milk and produce lactic acid, which inhibits the growth of harmful pathogenic bacteria. Mycobacterium causes tuberculosis, pox bacilli cause smallpox, and Candida Albicans is a yeast fungus.

Multiple choice
  1. clear nucleus

  2. pigments

  3. chlorophyll

  4. All of the above

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

Fungi lack chlorophyll, the pigment essential for photosynthesis. This is why they cannot produce their own food through photosynthesis like plants and must obtain nutrients from external sources as heterotrophs. Presence of a clear nucleus and pigments (other than chlorophyll) are not the limiting factors.

Multiple choice
  1. Cryptococcosis

  2. Dermatophytosis

  3. Endothrix

  4. Epizootic lymphangitis

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

Endothrix refers to dermatophyte infections of the hair that invade the hair shaft and internalize into the hair cell. This is in contrast to exothrix (ectothrix), where a dermatophyte infection remains confined to the hair surface.

Multiple choice
  1. Esophageal candidiasis

  2. Fungemia

  3. Histoplasmosis

  4. Mycosis

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

Fungemia is the presence of fungi or yeasts in the blood. It is most commonly caused by Candida species but can be caused by other fungi as well, including Aspergillus and Cryptococcus. It is most commonly seen in immunosuppressed or immunocompromised patients with severe neutropenia, oncology patients, or in patients with intravenous catheters.

Multiple choice
  1. Tetanus

  2. Trench fever

  3. Tuberculosis

  4. Sporotrichosis

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

Sporotrichosis is a disease caused by the infection of the fungus Sporothrix schenckii. This fungal disease usually affects the skin, although other rare forms can affect the lungs, joints, bones, and even the brain.

Multiple choice
  1. galls

  2. virgate

  3. acme

  4. stolon

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

Galls or cecidia are outgrowths on the surface of lifeforms caused by invasion by other lifeforms, such as parasites or bacterial infection. Plant galls are abnormal outgrowths of plant tissues and can be caused by various parasites, from fungi and bacteria to insects and mites.

Multiple choice
  1. Tinea pedis

  2. Tinea unguium

  3. Tinea cruris

  4. Tinea corporis

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

Jock itch of the groin, caused by tinea cruris, is a fungal infection that affects the skin of genitals, inner thighs and buttocks. Jock itch causes an itchy, red and often ring-shaped rash in these warm and moist areas of the body.

Multiple choice
  1. Penicillium notatum

  2. Aspergillus oryzae

  3. Rhizopus stolonifer

  4. Gibberella fujikuroi

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

Bakanae disease (also called 'foolish seedling disease') is a rice disease caused by Gibberella fujikuroi, a fungus that produces gibberellic acid, causing abnormal elongation of rice seedlings. Penicillium notatum produces penicillin, Aspergillus oryzae is used in fermentation, and Rhizopus stolonifer causes bread mold.

Multiple choice
  1. Penicillium

  2. Aspergillus

  3. Agaricus

  4. Paramecium

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

Penicillium, Aspergillus, and Agaricus are all fungi (kingdom Fungi), while Paramecium is a unicellular protist (kingdom Protista). The odd one out is Paramecium because it belongs to a different kingdom and is a protozoan, not a fungus.