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1
Which one is not an algae?
Spirogyra
Yeast
Ulva
Chlorella
2
Removal of ________________ by the action of microbes keeps our planet clean.
Non biodegradable substances.
Plants and animals
Food products
Dead bodies.
3
What are the uses of algae ?
In medicines
As food
In industries
All of these.
4
Where does virus reproduce ?
In cells of plants.
In cells of animals.
In cells of bacteria.
5
What are the advantages of microorganisms ?
Helps in production of food material.
Helps in fermentation.
Helps in the preparation of vaccine.
6
Which of the following substances are produced by an individual to prevent or resist the spread of microorganisms?
i. Antiseptics
ii. Antibiotics
iii. Antibodies
i and ii only
iiand iii only
iii only
ii only
7
A group of microoganisms that have the characters of both living and non-living are _________________.
Virus
Bacteria
Protozoa
Fungi
8
Which of the following organisms is not a 'fungi'?
Mushroom
Mould
Diatom
9
What are the harmful effects of algae ?
Some algae are toxic.
Some algae act as parasite.
Cause water pollution.
10
Which microorganism is smaller than bacteria?
Protozoan
Algae
11
Where can viruses reproduce?
Both inside and outside the cell
Only outside the cell
Only inside living cell
Only inside plant cell
12
Which of the following organisms is considered to be on the borderline of living and non-living ?
13
Which of the following organisms is used in the preparation of alcohol?
Mucor
14
Which of the following are correct :
(a) Microbes like bacteria and fungi act on the bodies of dead plants and animals and convert them into simple substances.
(b) Bacteria are also used in sewage treatment, where they help in the decay of waste organic matter.
(c) Microbes like bacteria and fungi act on the bodies of dead plants and animals and convert them into complex substances.
Only (a) and (b) are correct.
Only (b) and (c) are correct.
Only (a) and (c) are correct.
15
(a) Denitrification is the process that converts nitrate to nitrogen gas.
(b) Nitrification is the process that converts nitrate to nitrogen gas.
(c) Blue-green algae and bacteria like Rhizobium help in fixing atmospheric nitrogen and increasing soil fertility
None of these.