Microorganisms Questions

Objective questions

What are microorganisms?

A) Organisms visible to the naked eye. B) Living organisms that can only be seen with a microscope. C) Non-living chemical compounds. D) Large organisms that live in water.

Correct Answer: B) Living organisms that can only be seen with a microscope.

Which of the following is NOT a type of microorganism?

A) Bacteria B) Viruses C) Protists D) Mammals

Correct Answer: D) Mammals

Where are microorganisms found?

A) Only in water B) Only in air C) Almost everywhere, including water, air, and soil D) Only inside living organisms

Correct Answer: C) Almost everywhere, including water, air, and soil

What shape are bacteria classified as Streptococci?

A) Rod-shaped B) Spiral-shaped C) Chain-forming spherical shapes D) Comma-shaped

Correct Answer: C) Chain-forming spherical shapes

Which type of bacteria causes cholera?

A) Staphylococci B) Vibrios C) Spirilla D) Diplococci

Correct Answer: B) Vibrios

What is the genetic material in a virus surrounded by?

A) A cell wall B) A protein coat C) A lipid membrane D) A cytoplasmic layer

Correct Answer: B) A protein coat

Which microorganism is responsible for diseases like malaria?

A) Bacteria B) Protists C) Fungi D) Viruses

Correct Answer: B) Protists

What characteristic distinguishes cyanobacteria from other bacteria?

A) Lack of chlorophyll B) Ability to photosynthesize C) Presence of a nucleus D) Multicellular structure

Correct Answer: B) Ability to photosynthesize

What is a culture medium?

A) A liquid that kills bacteria. B) A material used to grow microorganisms in the lab. C) A solution used to sterilize equipment. D) A method to destroy viruses.

Correct Answer: B) A material used to grow microorganisms in the lab.

Which of the following instruments is NOT required for the preparation of a culture solution?

A) Microscope B) Petri-dishes C) Test tubes D) Thermometer

Correct Answer: D) Thermometer

What precaution should be taken during the preparation of agar solution?

A) Avoid using sterile equipment. B) Allow sick individuals to participate. C) Wash hands before and after the experiment. D) Leave the petri-dishes uncovered.

Correct Answer: C) Wash hands before and after the experiment.

Which microorganism cannot grow on a culture medium and requires a host cell?

A) Bacteria B) Fungi C) Algae D) Viruses

Correct Answer: D) Viruses

What type of microorganism is used to make penicillin?

A) Bacteria B) Fungi C) Algae D) Viruses

Correct Answer: B) Fungi

Which type of algae forms the major food source for aquatic animals?

A) Phytoplankton B) Rhizopus C) Penicillium D) Aspergillus

Correct Answer: A) Phytoplankton

Fungi feed in what way?

A) Photosynthetically B) Saprophytically C) Parasitically D) Chemosynthetically

Correct Answer: B) Saprophytically

What is the term for an agent that transports microbes from one location to another?

A) Vector B) Pathogen C) Culture D) Host

Correct Answer: A) Vector

How do houseflies act as mechanical carriers?

A) By becoming infected themselves. B) By allowing microbes to grow on their bodies. C) By carrying pathogens on their body surfaces. D) By digesting pathogens and spreading them.

Correct Answer: C) By carrying pathogens on their body surfaces.

What should be done with unused agar medium to ensure safety?

A) Store it in the refrigerator. B) Leave it in the open. C) Sterilize it with heat or disinfectant. D) Cover it tightly and reuse.

Correct Answer: C) Sterilize it with heat or disinfectant.

How can microorganisms be identified in a petri-dish culture?

A) By observing the color, growth pattern, and appearance of colonies. B) By tasting the culture medium. C) By measuring the weight of microorganisms. D) By observing their behavior under a microscope.

Correct Answer: A) By observing the color, growth pattern, and appearance of colonies.

Which of the following water sources could contain natural water microorganisms?

A) Rainwater B) Pond water C) Tap water D) Bottled water

Correct Answer: B) Pond water

Theory Questions

Mention five microorganisms

What is a culture medium?

State 4 precautions when preparing culture solution

What are vectors?

Mention two ways by which animal vectors carry pathogens.