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

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

Which of the following is not a common type of cheese mold?

  1. Penicillium roqueforti

  2. Penicillium camemberti

  3. Aspergillus niger

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

Rhizopus oligosporus is not a common type of cheese mold. It is a type of mold that is commonly found on bread and other baked goods.

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

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 of the following is NOT a type of fungus?

  1. Yeast

  2. Mold

  3. Mushroom

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

Bacteria are not fungi.

Multiple choice

What is the structure that allows fungi to absorb nutrients?

  1. Hyphae

  2. Spores

  3. Mycelium

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

Hyphae are thread-like structures that allow fungi to absorb nutrients.

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

Which of the following is a common type of skin rash that is caused by a fungal infection?

  1. Ringworm

  2. Athlete's foot

  3. Jock itch

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

Ringworm, athlete's foot, and jock itch are all common types of skin rashes that are caused by a fungal infection.

Multiple choice

What is the most common type of ringworm?

  1. Tinea corporis

  2. Tinea capitis

  3. Tinea cruris

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

Tinea pedis, also known as athlete's foot, is the most common type of ringworm.

Multiple choice

What is the primary cause of ringworm?

  1. Fungi

  2. Bacteria

  3. Viruses

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

Ringworm is caused by fungi that live on the skin.