Microorganisms: Friend and Foe (CBSE Class-8 Science): Questions 17 - 24 of 46

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Question number: 17

» Microorganisms: Friend and Foe » Food Preservation » Storage and Packing

MCQ▾

Question

Method of storing and packing of food is

Choices

Choice (4) Response

a.

Drying

b.

Irradiation

c.

UHT

d.

Canning

Question number: 18

» Microorganisms: Friend and Foe » Microorganisms » Virus

MCQ▾

Question

Viral diseases are:

Choices

Choice (4) Response

a.

Typhoid fever, Anthrax, Pneumonia

b.

Sleeping sickness, Malaria, diarrhoea

c.

Measles, Mumps, Chickenpox, Rabies

d.

Loose smut of wheat, potato blight

Question number: 19

» Microorganisms: Friend and Foe » Microorganisms » Bacteria and Fungi

MCQ▾

Question

Vitamin which we get from fungi is

Choices

Choice (4) Response

a.

Vitamin A

b.

Vitamin D

c.

Vitamin B

d.

Vitamin C

Question number: 20

» Microorganisms: Friend and Foe » Nitrogen Fixation » Nitrogen Cycle

MCQ▾

Question

Nitrification is the process of conversion of

Choices

Choice (4) Response

a.

Conversion of animals excretory product into ammonia

b.

Conversion of nitrites and nitrates from soil back to air

c.

Conversion of ammonia into nitrites then to nitrates

d.

The process of conversion of free nitrogen into its compounds

Question number: 21

» Microorganisms: Friend and Foe » Harmful Microorganisms » Disease Causing Microorganisms in Humans

MCQ▾

Question

Disease caused by micro-organisms in animals is:

Choices

Choice (4) Response

a.

Malaria

b.

Anthrax

c.

Foot and mouth disease

d.

Both b. and c. are correct

Question number: 22

» Microorganisms: Friend and Foe » Microorganisms » Bacteria and Fungi

MCQ▾

Question

what is the size of smallest bacteria?

Choices

Choice (4) Response

a.

1.25 micrometre

b.

0.15 micrometre in diameter

c.

1.5 micrometre in length

d.

None of the above

Question number: 23

» Microorganisms: Friend and Foe » Food Preservation » Preservation by Common Salt

MCQ▾

Question

Method of preservation of meat and fish is:

Choices

Choice (4) Response

a.

Salting

b.

Drying

c.

Irradiation

d.

Refrigeration

Question number: 24

» Microorganisms: Friend and Foe » Nitrogen Fixation » Nitrogen Cycle

MCQ▾

Question

Bacteria used in converting ammonia products in to ammonia are

Choices

Choice (4) Response

a.

Nitrosomonas bacteria

b.

Pseudomonas

c.

Putrefying bacteria

d.

Nitrobacter bacteria

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