MCQ on Class 8 Science Microorganisms Friends and Foe

Last updated on December 14th, 2023 at 08:02 am

 

Which plants commonly form a symbiotic relationship with Rhizobium bacteria?

1. a) Grasses
2. b) Trees
3. c) Ferns
4. d) Leguminous plants

Answer: d) Leguminous plants

 

What is the process of converting atmospheric nitrogen gas into nitrogen compounds called?

1. a) Nitrogen fixation
2. b) Nitrogen respiration
3. c) Nitrogen synthesis
4. d) Nitrogen absorption

Answer: a) Nitrogen fixation

 

What is the circulation of nitrogen between living things and the non-living environment called?

1. a) Nitrogen fixation
2. b) Nitrogen respiration
3. c) Nitrogen cycle
4. d) Nitrogen synthesis

Answer: c) Nitrogen cycle

 

The plant disease called ‘rust of wheat’ is caused by …….

1.  Virus
2.  Algae
3.  Fungi
4.  Bacteria

Answer: Fungi

 

Dengue is caused by a……………

1.  Virus
2.  None of These
3.  Protozoa
4.  Bacteria

Answer: Virus

 

Scientists who study microorganisms are known as ………

1.  Pedologist
2.  None of These
3.  Microbiologist.
4.  Ornithologist

Answer: Microbiologist

 

Malaria is caused by ………….

1.  Protozoa
2.  None of These
3.  Bacteria
4.  Virus

Answer: Protozoa

 

The insect which transmits disease-causing micro-organisms to humans is called a ……….

1.  Transmitter
2.  Carrier
3.  Messenger
4.  None

Answer: Carrier

 

The antibiotic ‘penicillin’ was discovered ‘Penicillium’ which is a ………….

1.  Fungus
2.  None of These
3.  Bacteria
4.  Algae

Answer: Fungus

 

The plant disease called ‘citrus canker’ is caused by …….

1.  Virus
2.  Bacteria
3.  Fungi
4.  Algae

Answer: Bacteria

 

Bacteria and fungi are used to make medicines called……….

1.  Vitamins
2.  Antibiotics
3.  Vaccines
4.  None

Answer: Antibiotics

 

Spiral-shaped bacteria are called ………

1.  Spirilla
2.  Bacilli
3.  Cocci
4.  None of These

Answer: Spirilla

 

The study of microorganisms is known as ………

1.  Pedology
2.  None of These
3.  Microbiology.
4.  Ornithology

Answer: Microbiology

 

The plant disease called ‘yellow vein mosaic of OKRA (bhindi)’ is caused by a ………

1.  Virus
2.  None of These
3.  Bacteria
4.  Protozoa

Answer: Virus

 

Rod-shaped bacteria are called ……….

1.  Cocci
2.  None of These
3.  Spirilla
4.  Bacilli

Answer: Bacilli

 

Who discovered the bacteria Bacillus anthracis which causes anthrax disease in animals in 1876?

1.  Robert Koch
2.  Louis Pasteur
3.  Oswald Avery
4.  None of These

Answer: Robert Koch

 

Microorganisms have a hard outer covering called ………

1.  Cyst
2.  None
3.  Bark
4.  Chitin

Answer: Cyst

 

Spherical-shaped bacteria are called …….

1.  Cocci
2.  Spirilla
3.  None of These
4.  Bacilli

Answer: Cocci

 

Edward Jenner discovered the vaccine for …………. in 1798.

1.  Polio
2.  Rabies
3.  Smallpox
4.  Varicella

Answer: Smallpox