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Class 8: Microorganisms: Friend and Foe

Total questions: 60

Worksheet time: 33mins

Name
Class
Date
1.

Blue- green algae can fix atmospheric_______ in the soil

a)

Carbon

b)

Nitrogen

c)

Oxygen

d)

All of the above

2.

Cholera is caused by________________

a)

Fungi

b)

Bacteria

c)

Algae

d)

None of the above

3.

The bread or idli dough rises because of

a)

Heat

b)

Grinding

c)

Growth of yeast cells

d)

fermentation

4.

Rhizobium bacteria___________

a)

help in nitrogen fixation

b)

help in digestion

c)

causes various diseases

d)

All of the above

5.

Malaria is caused by

a)

Protozoa

b)

Virus

c)

Algae

d)

Bacteria

6.

Penicillin is a

a)

Algae

b)

Fungus

c)

Vaccine

d)

Bacteria

7.

Spirogyra is

a)

a algae

b)

a fungi

c)

a protozoa

d)

a bacteria

8.

Vaccine for small pox was discovered by ____________

a)

Louise Pasteur

b)

Alexander Fleming

c)

Edward Jenner

d)

John Mendal

9.

Which of the following is an antibiotic

a)

Sodium Bicarbonate

b)

Streptomycin

c)

Alchohol

d)

Yeast

10.

Which was the first antibiotic to be discovered

a)

Crocin

b)

Penicillin

c)

Ayurveda

d)

None of the above

11.

Name a disease which is common in human and other animals

a)

Rabies

b)

Anthrax

c)

Social anxiety

d)

Cholera

12.

Bacteria is known as__________________ in an ecosystem when feeding on dead organisms.

a)

Decomposers

b)

Herbivore

c)

Pathogens

d)

Infections

13.

Fungi is beneficial to us beacause of the following reason

a)

They are a source of oxygen

b)

They can clean up pollution

c)

They are a source of antibiotics

d)

They help to clean run off from waste

14.

A Bacteria responsible for curdling of milk is

a)

Rhizobium

b)

Oscillatoria

c)

Lactobacillus

d)

Plasmodium

15.

The Fermentation process is discovered by

a)

Louis Pasture

b)

Alexander flaming

c)

Edward jenner

d)

John Mendal

16.

Mushroom belongs to

a)

Algae

b)

Virus

c)

Fungi

d)

None of the above

17.

Rhizobium bacteria

a)

Help in Digestion

b)

Help in nitrogen fixation

c)

Cause diseases

d)

All the above

18.

Amoeba belongs to

a)

Algae

b)

Fungi

c)

Virus

d)

Protozoa

19.
Which of the following is an example of a harmful microorganism?
a)
Fungi used as antibiotics
b)
Ecoli on food that makes people sick
c)
Bacteria found in yogurt.
d)
Microorganisms helping dead matter to decay
20.
Which of the following statements are true?
a)
All microorganisms are bad
b)
All microorganisms are good
c)
Some microorganisms are harmful, while some can be helpful
d)
Microorganisms are too small to do anything to anyone
21.
Which is not an example of a harmful microorganism?
a)
Mold growing on a kitchen sponge
b)
Bacteria found in yogurt
c)
Bacteria that causes turberculosis
d)
Salmonella on uncooked chicken
22.

Yogurt and cheese can be produced from ___________.

a)

Bacteria

b)

Virus

c)

Protozoa

d)

Algae

23.

What type of fungi is used to help bread rise?

a)

mushrooms

b)

yeast

c)

mold

d)

truffles

24.

A preparation of weakened or killed pathogens.

a)

Bacteria

b)

Antibiotic Resistance

c)

Vaccine

d)

Capsid

25.

Scientists must use a ____________________________ to see bacteria and protists.

a)

telescope

b)

magnifying glass

c)

microscope

d)

microorganism

26.

The process of conversion of sugar into alcohol in the absence of oxygen is called

a)

Pasteurization

b)

Vaccination

c)

Fermentation

d)

Decomposition

27.

Carrier of malaria causing protozoan is

a)

Female Anopheles mosquito

b)

Cockroach

c)

Housefly

d)

Butterfly

28.

Who discovered vaccine for smallpox?

a)

Robert Koch

b)

Edward Jenner

c)

Louis Pasteur

d)

Alexander Fleming

29.

The most common carrier of communicable diseases is

a)

Ant

b)

Housefly

c)

Dragonfly

d)

Spider

30.

Name the bacteria which promotes the formation of curd

a)

Rhizobium

b)

Cyanobacteria

c)

Lactobacillus

d)

Clostridium

31.

Disease causing microbes are called

a)

Pathogens

b)

Protozoa

c)

Parasites

d)

Microbes

32.

Penicillin was discovered by

a)

Edward Jenner

b)

Louis Pasteur

c)

Alexander Fleming

d)

Robert Brown

33.

Cold, influenza and most cough are caused by ___?

a)

Bacteria

b)

Viruses

c)

Fungi

d)

None of these

34.

Bacteria is known as__________________ in an ecosystem when feeding on dead organisms.

a)

Decomposers

b)

Herbivore

c)

Pathogens

d)

Infections

35.

Mushroom belongs to

a)

Algae

b)

Virus

c)

Fungi

d)

None of the above

36.

Antibiotics

a)

kill disease-causing microorganisms

b)

slow down the growth of disease-causing microorganisms

c)

convert sugar into alcohol

d)

speed up the growth of micoorganisms

37.

The process of conversion of sugar into alcohol is known as ...

a)

Budding

b)

Fusion

c)

Fermentation

d)

Fixation

38.

Consumption of food spoiled by some micro-organisms causes ____.

a)

Food-poisoning

b)

Cancer

c)

Lungs

d)

None of these

39.
Are microorganisms helpful or harmful?
a)
Helpful
b)
Harmful
c)
Both
d)
Neither
40.

A fungus that causes skin disease.

a)

Ring Worm

b)

Salmonella

c)

Yeast

d)

Athletes Foot

41.

Carrier of malaria causing protozoan is

a)

Female Anopheles mosquito

b)

Cockroach

c)

Housefly

d)

Butterfly

42.

The disease caused by protozoa is

a)

tuberculosis

b)

polio

c)

typhoid

d)

malaria

43.

Whenever any harmful disease-causing microorganism enters the human body, the body produces substances to fight with the entered microbe. It is called

a)

Antibodies

b)

Tuberculosis

c)

Algae

d)

Fungi

44.

Which of the following is not used as food preservatives?

a)

Salt

b)

Sugar

c)

Vinegar

d)

Methane

45.

Fungi consist of two main groups of organisms ………….. and moulds.

a)

Yeast

b)

Algae

c)

Bread

d)

None of these options

46.

Microorganisms can be found only in air and water.

a)

True

b)

False

47.

Protozoa cause diseases like dysentery and malaria.

a)

True

b)

False

48.

Identify Me

I may be found as a single cell or as multiple cells.

I have a cell wall and chloroplast ,but i don't have roots,shoots or leaves

a)

Bacteria

b)

Virus

c)

Algae

d)

Fungi

49.

Which of the following is not a bacteria

a)

E.Coli

b)

Salmonella

c)

Bacillus Anthracis

d)

Bacteriophage

50.

A fungi which is a rich source of protein

a)

Mushroom

b)

Chlamydomonas

c)

Tofu

d)

Aspergillus

51.

Father of modern microbiology

a)

Edward Jenner

b)

Antonie van Leeuwenhoek

c)

Robert Koch

d)

Louis Pasteur

52.

Name the organism

a)

Paramecium

b)

Cockroach

c)

Amoeba

d)

Chlamydomonas

53.

Antibiotics are not useful against viral infections

a)

False

b)

True

54.

Which among the following insects is vector of the Dengue virus

a)

Female Anopheles Mosquito

b)

Female Aedes Mosquito

c)

House fly

d)

Cockroach

55.

Name the chemical preservative used in jams and squashes

a)

Carbon Benzoate

b)

Salt

c)

Sodium metabisulphite

d)

Oil and vinegar

56.

What do you think microbe means ?

a)

A microorganism, or microbe, is a microscopic organism, which may exist in its single-celled form or in a colony of cells.

b)

It is a thing that enters the human body or an animal .

c)

It is an insect

d)

It is something that we found it in the ocean

57.
All bacteria are
a)
unicellular
b)
multicellular
c)
eukaryotic
58.
Probiotics are an example of ....
a)
A microorganisms that can make people sic
b)
A microorganism that lives in the ocean
c)
An example of bacteria and all bacteria is harmful
d)
an example of live bacteria and yeast that is helpful to humans by aiding in the digestion of food
59.
The different colors in algae are caused by _____________.
a)
pigments
b)
protozoans
c)
cilia
d)
phytoplankton
60.

Bacteriophage is a

a)

Bacteria

b)

Virus

c)

Protozoan

d)

Funguss

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