Microorganisms: Friend and Foe-Nitrogen Fixation (CBSE Class-8 Science): Questions 1 - 5 of 5

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Question number: 1

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

MCQ▾

Question

Nitrogen cycle is also called a perfect cycle because

Choices

Choice (4) Response

a.

Concentration of nitrogen in atmosphere always changing

b.

Concentration of nitrogen is same at day

c.

Concentration of nitrogen in atmosphere is same at nights

d.

Concentration of nitrogen in atmosphere always remain same

Question number: 2

» Microorganisms: Friend and Foe » Nitrogen Fixation » Process of Nitrogen Fixation

MCQ▾

Question

Fixation of Nitrogen is:

Choices

Choice (4) Response

a.

The process of conversion of free nitrogen into compounds of nitrogen.

b.

Free nitrogen present in the atmosphere.

c.

Release of ammonia after death or decay of plant bodies.

d.

Conversion of nitrogen into amino acids and proteins by the plants

Question number: 3

» 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: 4

» 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

Question number: 5

» Microorganisms: Friend and Foe » Nitrogen Fixation » Process of Nitrogen Fixation

MCQ▾

Question

Steps involved in nitrogen cycle are:

Choices

Choice (4) Response

a.

Ammonification

AND

Nitrogen Fixation

b.

Nitrification

c.

De-nitrification

d.

All a. , b. and c. are correct

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