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 biology micro organisms food production and microorganisms microbial products - food, medicines and industrial products uses of microorganisms

Hyphomycetes is a group of

  1. Mushroom

  2. Yeast

  3. Mould

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mould is a fungus that grows on the bread when kept outside for long, molds feed on the carbohydrate present on the bread. Fungi have the saprophytic mode of nutrition. Fungi is further classified into fungi imperfecti called Hyphomycetes.

So, the correct option is 'Fungi'.

Multiple choice biology food production food production and microorganisms microbial products - food, medicines and industrial products uses of microorganisms

Curing of Tea leaves is accomplished by

  1. Viruses

  2. Fungi

  3. Mycorrhiza

  4. Bacteria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Curing of tea leaves is accomplished by bacteria. Leaves of tea and tobacco are cured off their bitterness with the help of certain bacteria, e.g., Bacillus megatherium. Beans of coffee and cocoa are similarly cured.

Multiple choice transpiration major activities of living organisms biology

Collecters secreting sticky exudations are characteristic of

  1. Pyrus

  2. Rosa

  3. Nicotiana

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In Botany, the term exudate refers to the fluid emitted through pores in the plants and the process is called as exuding. Examples of plant exudates are saps, gums, resins, latex and nectar. Sticky exudates are released from the glandular trichomes of the leaves or branches when damaged or even flowers. These sticky exudations are tactile signals of the plants which either work as alarm signals to the aphids, traps insects or are signals for pollinators.
Therefore, the correct answer is option D.

Multiple choice evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

Consider the following fungi:
1. Arthrobotrys oligospora
2. Dactylella cionopaga
3. Streptorrryces rimosus
Which of these are predaceous for the biological control of nematodes in soil?

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arthrobotrys oligospora and Dactylella cionopaga are well-documented predatory fungi that trap and consume nematodes using specialized structures like adhesive nets or rings. Streptomyces rimosus (note spelling: Streptomyces) is a soil bacterium producing antibiotics, not a predatory fungus.

Multiple choice zoology molecular basis of inheritance genome projects human genome project human genome project and dna fingerprinting

The commonly used hosts in HGP ________________.

  1. Bacteria and yeast

  2. Bacteria and fungi

  3. Protozoa and bacteria

  4. Plants and fungi
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the Human Genome Project, DNA fragments were cloned into vectors and propagated in host organisms to be sequenced. Bacteria (using BACs) and yeast (using YACs) were the primary hosts used for this purpose.

Multiple choice biology seeds - structure and germination germination seed germination the flower

In which one of the following pathogens do the cells of promycelium after the germination of teleutospore produced infection hyphae instead of basidiospores?

  1. Ustilago scitaminae

  2. Tilletia foetida

  3. Tilletia tritici

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

In Ustilago scitaminae, the promycelium typically produces infection hyphae directly rather than forming basidiospores, which is a characteristic feature of this smut fungus.

Multiple choice botany root - external morphology root systems root system in plants forms of root

Primary inoculums of red rot of sugarcane comes from _______________.

  1. Mycelium in reddened pith

  2. Conidia and mycelium in buds

  3. Acervuli in the rind

  4. Conidia and mycelium in debris
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Red rot of sugarcane is caused by Colletotrichum falcatum. The primary inoculum is the mycelium that survives in the infected pith of the sugarcane stalks used for planting.

Multiple choice evs - i food for all improved methods of agriculture receding water table water conservation and irrigation cropping patterns whose forests?

Storage grains produce aflatoxin due to growth of

  1. yeast

  2. mould

  3. Aspergillus

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

Aspergillus consists of several hundred mould species found in various climates worldwide. Aspergillus is highly aerobic and are found in almost all oxygen rich environments. The storage grain produces aflatoxin due to growth of Aspergillus which can cause acute liver damage and cancer.

Multiple choice plant diseases keeping diseases away biology

Pusa Swarnim a variety of Brassica is resistant to

  1. Bacterial blight

  2. White rust

  3. Curl and black rot

  4. Mosaic virus.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pusa Swarnim is a biofortified and disease-resistant variety of Brassica (mustard) specifically developed for resistance against White rust.