Microorganisms: Friend and Foe (CBSE Class-8 Science): Questions 10 - 16 of 46

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Question number: 10

» 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: 11

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

MCQ▾

Question

Nucleus of the bacteria is called as

Choices

Choice (4) Response

a.

Spirilla

b.

Nucleus

c.

Nucleoid

d.

Vibrios

Question number: 12

» Microorganisms: Friend and Foe » Microorganisms » Virus

MCQ▾

Question

Habitat of micro-organism is:

Choices

Choice (4) Response

a.

Soil

b.

Air

c.

Water

d.

All a. , b. and c. are correct

Question number: 13

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

MCQ▾

Question

Name of parasitic Fungi is

Choices

Choice (4) Response

a.

Mushrooms

b.

Yeast

c.

Mildews

d.

Moulds

Question number: 14

» Microorganisms: Friend and Foe » Microorganisms » Where Do Microorganisms Live?

MCQ▾

Question

Cyst is:

Choices

Choice (4) Response

a.

Blue-green bacteria

b.

A small capsule like sac that enclose an organism in resting stage.

c.

The outermost layer of earth

d.

In animals a multi-layered extra cellular external body covering

Question number: 15

» 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: 16

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

MCQ▾

Question

Bacterial diseases in plants are:

Choices

Choice (4) Response

a.

Leaf spot of cotton

b.

Citrus canker, potato scab

c.

loose smut of wheat, potato blight

d.

Both a. and b. are correct

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