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 categories is penicillium from?

  1. Bacteria from the family of lacto bacillus

  2. Fungus from the family of Trichocomaceae

  3. Virus in the family of Abaca Bunchy

  4. Protozua from the family of Sphores
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Penicillium is a species of fungus from the family Trichocomaceae. It is common in temperate and subtropical regions and can be found on salted food products, but it is mostly found in indoor environments, especially in damp or water-damaged buildings. 

Multiple choice

Match the name of the disease with the causal organism.

Disease Causal organism
P. False smut of rice 1. Plasmopara viticola
Q. Ring rot of potato 2. Collectotrichum falcatum
R. Red rot of sugarcane 3. Corynebacterium sepidonicum
S. Downy mildew of grape 4. Ustilaginoidea virens
5. Erwinia amylovora
6. Synchytrium endobioticum

  1. P - 1, Q - 5, R - 2, S - 4

  2. P - 4, Q - 3, R - 2, S - 1

  3. P - 6, Q - 2, R - 4, S - 1

  4. P - 5, Q - 3, R - 2, S - 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice

Match the following sauerkraut defects for their causative agents

P. Soft kraut 1. Due to growth of bacteria, mold and/or yeast
Q. Slimy kraut 2. Due to surface growth of Torula yeast
R. Rotted kraut 3. Bacterial growth does not initiate till last stage
S. Pink kraut 4. Rapid growth of Lactobacillus cucumens and L, plantarum specially at elevated temperature

  1. P – 4, Q – 2, R – 3, S – 1

  2. P – 3, Q – 4, R – 1, S – 2

  3. P – 1, Q – 3, R – 2, S – 4

  4. P – 2, Q – 1, R – 4, S – 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soft kraut (P-4) is caused by rapid fermentation at high temperatures. Slimy kraut (Q-2) is due to Torula yeast. Rotted kraut (R-3) is due to delayed bacterial initiation. Pink kraut (S-1) is due to yeast/mold growth.

Multiple choice

What do you call a fungal infection of the skin?

  1. ringworm

  2. herpes

  3. impetigo

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

Ringworm, or tinea, is a common fungal infection of the skin. Herpes is viral, impetigo is bacterial, and folliculitis is inflammation of the hair follicle.

Multiple choice botany root - external morphology zones of the root morphology of root root system in plants

Hairy root disease of dicot plants is caused by

  1. Agrobacterium tumefaciens

  2. Agrobacterium rhizogene

  3. Bacillus thuringiensis

  4. Meloidogyne incognita
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • A soil bacterium Agrobacterium rhizogenes causes “hairy root” disease in some dicotyledonous plants(For example, capsicum species).
  • A bacterial Ri (root inducing) plasmid integrates its transfer-DNA (T-DNA) into the plant genome (DNA). As a result, rapidly growing and intensely branched (hairy) adventitious roots are developed.
  • Hence Hairy root disease of dicot plants is caused by Agrobacterium rhizogene.
  • So, the correct answer is 'Agrobacterium rhizogene'.
Multiple choice evs developmental journey of seed seed to plants germination of seeds life within the seed

The species of Tilletia responsible for hill bunt or stinking smut of wheat are __________________.

  1. Tilletia caries and T. Foetida

  2. Tilletia caries and T. Barclayana

  3. Tilletia contraversa and T. Caries

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tilletia caries and T. foetida are the primary fungal species responsible for causing common bunt or stinking smut in wheat.

Multiple choice biology cell biology and biotechnology agritourism biotechnology commercial applications of biotechnology

Natural resistance to late blight of potato is present in

  1. Solanum tuberosum

  2. Solanum acaule

  3. S. demissum

  4. S. stoioniferum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Complete destruction of the potato crop by late blight caused the 'Irish potato famine' in the middle of the 19th century, led to the search for resistant plants. Single genes for resistance to late blight (R genes) were discovered nearly 100 years ago in S. demissum, a wild potato species indigenous to Mexico.

Multiple choice biology biosystematics species, communities and ecosystems kingdom fungi monera, protista, fungi

Which of the following is an edible fungus? 

  1. Mushroom

  2. Cabbage

  3. Pea

  4. Rhizobium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Edible mushrooms are fleshy and have edible fruit bodies. They are found either below ground or above ground where they may be picked by hand. Edibility is due to the absence of poisonous effects on humans and desirable taste and aroma.

So, the correct answer is 'So, the correct answer is 'Mushroom'
Multiple choice evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods

Which of the following is a seed borne disease

  1. Bacterial blight of rice

  2. Kharia of paddy

  3. Whiptail of Brassica

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacterial blight of rice is a seed borne disease which is transmitted to paddy. Seedlings when raised under high humid conditions. This disease is caused by Xanthomonas oryzae.