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

What is the scientific name of the fungus that causes black bread mold?

  1. Rhizopus stolonifer

  2. Aspergillus niger

  3. Penicillium roqueforti

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

Rhizopus stolonifer is a fungus that commonly causes black bread mold, characterized by its rapid growth and black spores.

Multiple choice

Which of the following is a fungus that causes athlete's foot and ringworm?

  1. Trichophyton rubrum

  2. Candida albicans

  3. Aspergillus fumigatus

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

Trichophyton rubrum is a fungus that is the most common cause of athlete's foot and ringworm.

Multiple choice

What are the main pests and diseases that affect rye?

  1. Ergot

  2. Rust

  3. Smut

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

Ergot, rust, smut, and aphids are the main pests and diseases that affect rye.

Multiple choice

What is the primary disease that has devastated banana plantations worldwide?

  1. Panama disease

  2. Black Sigatoka

  3. Banana bunchy top virus

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

Panama disease, caused by the fungus Fusarium oxysporum f. sp. cubense, is a devastating disease that has caused significant losses in banana plantations worldwide. It affects the roots and vascular system of the plant, leading to wilting and eventually death.

Multiple choice

Which of the following is NOT a type of microbial nutrition?

  1. Autotrophic

  2. Heterotrophic

  3. Mixotrophic

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

Parasitic nutrition is not a type of microbial nutrition, but rather a type of symbiotic relationship in which one organism (the parasite) benefits at the expense of another organism (the host).

Multiple choice

What is the term used to describe the mutually beneficial relationship between a plant and a fungus?

  1. Mycorrhizae

  2. Rhizobia

  3. Endophytes

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

Mycorrhizae is a symbiotic relationship between a plant and a fungus, where the fungus helps the plant absorb water and nutrients from the soil, while the plant provides the fungus with carbohydrates.

Multiple choice

What is the term used to describe a microorganism that lives inside a plant without causing harm?

  1. Pathogen

  2. Endophyte

  3. Epiphyte

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

Endophytes are microorganisms that live inside a plant without causing harm. They can provide various benefits to the plant, such as protection against pathogens, drought tolerance, and enhanced nutrient uptake.

Multiple choice

Which type of microorganism is responsible for causing plant diseases?

  1. Pathogens

  2. Symbionts

  3. Endophytes

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

Pathogens are microorganisms that cause disease in plants. They can be bacteria, fungi, viruses, or nematodes, and they can infect plants through various means, such as wounds, stomata, or roots.

Multiple choice

Which type of microorganism is responsible for forming symbiotic relationships with mycorrhizal fungi?

  1. Mycorrhizae

  2. Rhizobia

  3. Endophytes

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

Mycorrhizae are symbiotic relationships between plants and fungi. The fungus helps the plant absorb water and nutrients from the soil, while the plant provides the fungus with carbohydrates.

Multiple choice

Which type of microorganism is responsible for causing damping-off disease in seedlings?

  1. Pythium

  2. Rhizobia

  3. Endophytes

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

Pythium is a type of fungus that is responsible for causing damping-off disease in seedlings. This disease can cause the seedlings to rot and die, and it is a major problem in nurseries and greenhouses.

Multiple choice

Which type of microorganism is responsible for causing powdery mildew disease in plants?

  1. Erysiphe

  2. Rhizobia

  3. Endophytes

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

Erysiphe is a type of fungus that is responsible for causing powdery mildew disease in plants. This disease can cause the leaves of plants to become covered in a white powdery substance, and it can reduce the plant's ability to photosynthesize.

Multiple choice

Which type of microorganism is commonly used in the production of biopesticides?

  1. Bacteria

  2. Fungi

  3. Protozoa

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

Bacteria, particularly certain species of Bacillus and Pseudomonas, are commonly used in the production of biopesticides, which are environmentally friendly alternatives to chemical pesticides.

Multiple choice

What is the primary vector for the spread of Dutch elm disease?

  1. Bark beetles

  2. Aphids

  3. Fungi

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

Bark beetles are the primary vector for the spread of Dutch elm disease, transmitting the fungal pathogen Ophiostoma ulmi from infected to healthy elm trees.

Multiple choice

Which disease is caused by the fungus Phytophthora ramorum and affects a wide range of tree species, including oaks and tanoaks?

  1. Sudden oak death

  2. Chestnut blight

  3. Dutch elm disease

  4. White pine blister rust
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sudden oak death is caused by the fungus Phytophthora ramorum and affects various tree species, including oaks and tanoaks.

Multiple choice

What is the primary management strategy for controlling white pine blister rust?

  1. Applying fungicides to infected trees

  2. Removing infected branches and cankers

  3. Planting resistant tree species

  4. Encouraging natural predators of the rust fungus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Planting resistant tree species is the primary management strategy for controlling white pine blister rust, as it reduces the susceptibility of forests to the disease.