CBSE Class-8 Science: Questions 10 - 17 of 469

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Question number: 10

» Crop Production and Management » Harvesting » Threshing and Winnowing

MCQ▾

Question

The process of removing chaff from the threshed grain is called

Choices

Choice (4) Response
a.

Harvesting

b.

Threshing

c.

Winnowing

d.

Weeding

Question number: 11

» Microorganisms: Friend and Foe » Microorganisms » Protozoa and Algae

MCQ▾

Question

Algae that increases the soil fertility is

Choices

Choice (4) Response
a.

Real Algae

b.

Nostoc and Anabaena

c.

Diatoms

d.

Kelps

Question number: 12

» Microorganisms: Friend and Foe » Commercial Use of Microorganisms » Cleaning the Environment

MCQ▾

Question

Micro-organisms decompose organic waste such as

Choices

Choice (4) Response
a.

Vegetable peels, plants and animal waste

b.

Medicines

c.

Cheese, pickles

d.

Vaccines

Question number: 13

» Microorganisms: Friend and Foe » Harmful Microorganisms » Food Poisoning

MCQ▾

Question

Bacteria which causes the food poisoning is:

Choices

Choice (4) Response
a.

Escherichia coli

b.

Peneumococcus

c.

Spirilla

d.

Salmonella and Staphylococcus

Question number: 14

» Crop Production and Management » Preparation of Soil » Agricultural Implements

MCQ▾

Question

Name the tool used for making soil soft for penetration of roots

Choices

Choice (4) Response
a.

Hoe

b.

Ploughshare

c.

wooden plank

d. Question does not provide sufficient data or is vague

Question number: 15

» Microorganisms: Friend and Foe » Microorganisms » Protozoa and Algae

MCQ▾

Question

The term Protozoa means:

Choices

Choice (4) Response
a.

The most primitive and simplest animal

b.

Disease causing agents

c.

The disease causing micro-organisms

d.

Organisms which are the carriers of parasite

Question number: 16

» Crop Production and Management » Irrigation » Modern Methods of Irrigation

MCQ▾

Question

Which method of irrigation is useful for gardens and fruit plants?

Choices

Choice (4) Response
a.

Moat

b.

Rahat

c.

Pulley system

d.

Drip system

Question number: 17

» 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

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