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Microorganisms friend and foe

Total questions: 84

Worksheet time: 1hrs 9mins

Name
Class
Date
1.

Which of the following statements about freezing as a method of food preservation is INCORRECT?

a)

It helps to slow down the growth of food spoiling bacteria.

b)

It kills the bacteria present in the food.

c)

It helps to slow down the enzyme activity of food spoiling bacteria

d)

The water inside the food freezes into ice crystals

2.

What food preservation technique has been used here?

a)

Freezing.

b)

Drying.

c)

Salting.

3.

It is the removal of the moisture content of the food.

a)

Drying

b)

Freezing

c)

Salting

4.

Assertion: Pasteurisation is the method to preserve milk.

Reason: In pasteurisation, the milk is heated to high temperature and cool down slowly.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

5.

Assertion: Adding salt preserves the meat and fish for ages.

Reason: Salt draws water out of food and dehydrates the food.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

6.

Which of the following is considered a physical property of an element?

a)

density

b)

color

c)

conductivity

d)

flammable

7.

Malleability is a physical property. It means . . .

a)

a solid element can be crushed into a powder.

b)

a solid piece of metal can be hammered into a shape.

c)

a solid piece of metal can be pulled into a wire.

d)

a solid can be melted to a liquid.

8.
Which of the following is a property of a non-metal?
a)
Conducts electricity and heats well
b)
Can be hammered into thin sheets
c)
Is brittle and breaks easily
d)
Has a shiny, metallic luster
9.

Assertion: Mercury is widely used in clinical thermometer.

Reason: Mercury is solid at room temperature.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

10.

Assertion: Copper used widely to conduct electricity.

Reason: Silver has the highest electrical conductivity of all metals.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

11.

Name the groups in which microorganisms are broadly classified.

a)

yeast

b)

fungi

c)

protozoa

d)

algae

12.

What helps in the rise of bread or dosa dough?

a)

Heat

b)

Grinding

c)

Growth of yeast cells

d)

Low pressure

13.

The disease caused by protozoa is

a)

tuberculosis

b)

polio

c)

typhoid

d)

malaria

14.

The process of putting a vaccine inside the body of a person in order to produce immunity against some disease is called (a)  

(if you put the answer right but came wrong then the word could contain capital letters)

15.

(a)   is the ability of a body to develop resistance against diseases.

16.

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

17.

Which of the following is not used as food preservatives?

a)

Salt

b)

Sugar

c)

Vinegar

d)

Methane

18.

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

a)

Yeast

b)

Algae

c)

Bread

d)

None of these options

19.

Microorganisms can be found only in air and water.

a)

True

b)

False

20.

Protozoa cause diseases like dysentery and malaria.

a)

True

b)

False

21.

Jams, jellies and squashes are preserved by adding salt.

a)

True

b)

False

22.

Name the groups in which microorganisms are broadly classified.

a)

yeast

b)

fungi

c)

protozoa

d)

algae

23.

Microorganisms are classified into (a)   major groups

24.

Another name for a microorganism is (a)  

25.

Bacteria and yeast are alsohelpful for (a)   of rice idlisand dosa batter

26.

Beneficial or Harmful?


Plankton are a food source for small fish

a)

beneficial

b)

harmful

27.

What are bacteria that cause disease?

a)

viruses

b)

pathogens

c)

endospores

d)

antibiotics

28.

Assertion: Adding salt preserves the meat and fish for ages.

Reason: Salt draws water out of food and dehydrates the food.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

29.

Penicillin is a

a)

Algae

b)

Fungus

c)

Vaccine

d)

Bacteria

30.

Viruses have all cell organelles present in them.

a)

True

b)

False

31.

Beneficial or Harmful?


yeast used to cause bread to rise

a)

beneficial

b)

harmful

32.

Beneficial or Harmful?


fungus & bacteria decomposes tree limbs in forest

a)

beneficial

b)

harmful

33.

Is it possible for Bacteria to grown immune to Antibiotics?

a)

Yes

b)

No

c)

Maybe

34.

Can Fungi spoil only cooked foods?

a)

Yes

b)

No

c)

Maybe

35.

Assertion: Copper used widely to conduct electricity.

Reason: Silver has the highest electrical conductivity of all metals.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

36.

Vaccine for small pox was discovered by ____________

a)

Louise Pasteur

b)

Alexander Fleming

c)

Edward Jenner

d)

John Mendal

37.

Beneficial or Harmful?


bacteria used in cheese and yogurt

a)

beneficial

b)

harmful

38.
Which of the following is a property of a non-metal?
a)
Conducts electricity and heats well
b)
Can be hammered into thin sheets
c)
Is brittle and breaks easily
d)
Has a shiny, metallic luster
39.

Beneficial or Harmful?


algae causes Red Tide

a)

beneficial

b)

harmful

40.

Which of the following is not responsible for spoilage of food?

a)

Algae

b)

Fungi

c)

Bacteria

d)

Chemical

41.

What describes the relationship of microorganisms to humans?

a)

harmful

b)

useful

c)

both harmful and useful

d)

nethier harmful nor useful

42.

Vaccine for small pox was discovered by ____________

a)

Louise Pasteur

b)

Alexander Fleming

c)

Edward Jenner

d)

John Mendal

43.
Turberculosis is a disease that was widespread during the turn of the century.  This disease is an example of.....
a)
A helpful bacteria
b)
A helpful fungi
c)
A harmful bacteria
d)
A harmful probiotic
44.
Are microorganisms helpful or harmful?
a)
Helpful
b)
Harmful
c)
Both
d)
Neither
45.

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

46.

What science tool is used to view organisms too small to see with a magnifying lens?

a)

telescope

b)

binoculars

c)

microscope

d)

netherscope

47.

Beneficial or Harmful?


Algae in the ocean makes oxygen

a)

beneficial

b)

harmful

48.

Beneficial or Harmful?


bacteria in uncooked chicken

a)

beneficial

b)

harmful

49.

Beneficial or Harmful?


algae causes Red Tide

a)

beneficial

b)

harmful

50.

Beneficial or Harmful?


bacteria used in cheese and yogurt

a)

beneficial

b)

harmful

51.

Beneficial or Harmful?


yeast used to cause bread to rise

a)

beneficial

b)

harmful

52.

Beneficial or Harmful?


bacteria weakens teeth enamel

a)

beneficial

b)

harmful

53.

Beneficial or Harmful?


fungus & bacteria decomposes tree limbs in forest

a)

beneficial

b)

harmful

54.

Beneficial or Harmful?


Plankton are a food source for small fish

a)

beneficial

b)

harmful

55.
This microorganism has whip-like flagella, that help them move.
a)
Virus
b)
Bacteria
c)
Algae
d)
Fungi
56.
All bacteria are
a)
unicellular
b)
multicellular
c)
eukaryotic
57.
Some bacteria is known as ________________ and cause disease.
a)
pathogens
b)
flagella
c)
influenza
d)
ebola
58.
Bacteria is known as ______________ in an ecosystem when feeding on dead organisms.
a)
decomposers
b)
herbivores
c)
pathogens
d)
infections
59.
The smallest microorganism on earth is known as  _____________
a)
a virus
b)
bacteria
c)
algae
d)
fungi
60.
Viruses can also be called ______________
a)
flagella
b)
parasites
c)
decomposers
d)
pathogens
61.
This microorganism uses host cells to make copies of itself
a)
Protozoa
b)
Fungi
c)
Virus
d)
Bacteria
62.
Fungi is benefical to us because 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
63.
What is true about bacteria?
a)
Bacteria use photosynthesis to make their own food
b)
Bacteria can only be found in dirt
c)
Bacteria is always beneficial
d)
Bacteria can be used to make certain foods
64.
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
65.
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
66.

What type of fungi is used to help bread rise?

a)

mushrooms

b)

yeast

c)

mold

d)

truffles

67.

Scientists must use a ____________________________ to see bacteria and protists.

a)

telescope

b)

magnifying glass

c)

microscope

d)

microorganism

68.

What is an antibiotic?

a)

a rapid spread of a disease around the world

b)

a type of bacteria living in human cells

c)

a medicine that attacks harmful microbes

d)

a disease for which there is no known cure

69.
Which of the following is the basic building block of living organisms?
a)
cell 
b)
organelle
c)
nucleus
d)
organ system
70.
Amoebas have no definite shape
a)
True
b)
False
71.
The different colors in algae are caused by _____________.
a)
pigments
b)
protozoans
c)
cilia
d)
phytoplankton
72.

Microbes are effective due to their

a)

Various shapes

b)

Ability to reproduce

c)

Tolerance

d)

Both b and c

73.

Microorganisms are

a)

Autotrophs & heterotrophs

b)

Autotrophs only

c)

Saprophytes only

d)

Hetrotrophs only

74.

Bacteriophage is a

a)

Bacteria

b)

Virus

c)

Protozoan

d)

Funguss

75.

Yogurt and cheese can be produced from ___________.

a)

Bacteria

b)

Virus

c)

Protozoa

d)

Algae

76.

_________________ bacteria are in your _________________ to help digest food.

a)

Helpful; throat

b)

Helpful; stomach

c)

Harmful; esophagus

d)

Harmful; lungs

77.

A bacteria responsible for curdling of milk is:

(a)  

78.

What type of fungi is used to help bread rise?

a)

mushrooms

b)

yeast

c)

mold

d)

truffles

79.

A preparation of weakened or killed pathogens.

a)

Bacteria

b)

Antibiotic Resistance

c)

Vaccine

d)

Capsid

80.

Are microorganisms helpful or harmful?

(a)  

81.

Yeast makes bread, rolls and cakes rise.

a)

True

b)

False

82.

Scientists must use a ____________________________ to see bacteria and protists.

a)

telescope

b)

magnifying glass

c)

microscope

d)

microorganism

83.

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

84.

What is an antibiotic?

a)

a rapid spread of a disease around the world

b)

a type of bacteria living in human cells

c)

a medicine that attacks harmful microbes

d)

a disease for which there is no known cure

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