CBSE (Central Board of Secondary Education- Board Exam) Class-8 Science: Questions 18 - 24 of 469

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Question number: 18

» 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: 19

» 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: 20

» 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: 21

» Crop Production and Management » Harvesting » Harvesting

MCQ▾

Question

Combine is combination of two machines i. e.

Choices

Choice (4) Response

a.

Thresher and sickles

b.

Sickles or harvesters

c.

Thresher and winnow machine

d.

Harvester and thresher

Question number: 22

» 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: 23

» 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: 24

» 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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