class 8 MSQ of chapter 2 Microornism: Friend and Foe
Answers
Answer:
friend : microorganisms are used to make some medicine
yeast is used in cake bread
foe : it can spoil the good
Which of the following is a disease caused by protozoans?
- Tuberculosis
- Polio
- Malaria
- Typhoid
Answer: (C) Malaria
Which of the following diseases is caused by a bacteria?
- Chicken pox
- Tuberculosis
- Dengue
- Polio
Answer: (B) Tuberculosis
Some plants have nitrogen-fixing bacteria in their root nodules. What are these bacteria called?
- Blue green algae
- Nitrosomonas
- Azotobacter
- Rhizobium
Answer: (D) Rhizobium
In order to take precautionary steps to control dengue, we must take measures to stop the breeding of:
- Aedes mosquito
- Fleas
- Fire ants
- Anopheles mosquito
Answer: (A) Aedes mosquito
Partial sterilization of a product such as milk at a high temperature is known as:
- Pasteurization
- Filtration
- Pickling
- Refrigeration
Answer: (A) Pasteurization
Living organisms which are invisible to the naked eye are called _________ .
- Particles
- Molecules
- Microorganisms
- Macroorganisms
Answer: (C) Microorganisms
Which of the following is a communicable disease?
- Diabetes
- Chicken pox
- Alzheimer’s
- Cancer
Answer: (B) Chicken pox
Vaccines are made up of:
- Chemicals
- Weak microorganisms
- Viruses
- Drugs
Answer: (B) Weak microorga
The bacterium present in curd is:
- Salmonella typhi
- Lactobacillus
- Penicillin
- Vibrio cholera
Answer: (B) Lactobacillus
While baking cakes, yeast reproduces rapidly and produces ___ gas.
- Hydrogen
- Oxygen
- carbon dioxide
- nitrogen
Answer: (C) carbon dioxide