Question

FRIEND AND FOE
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27
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Q. 4. Describe the main characteristic of viruses in brief.
Ans. Viruses are very small organisms and can be seen under an electron microscope.
Ordinarily, their presence is felt by the effect they have on their hosts. They have no
independent existence. It is a non divinis particle when cemains outside a living cell. They
amount of a genetic material enclosed by a protective protein coat. They are parasitie in
nature,
Q. 5. What do you know about protozoa?
Ans. Protozoa are single celled living cells, Amoeba, Paramecium, Euglena, Plasmodium
are examples of protozoa, They are oval, spherical and elongated in shape. They cause
diseases like malaria and dengue. They decompose organic matters to convert them in useful
soil nutrients
Q. 6. What are fungi?
Ans. Fungi are microorganisms which exist in unicellular as well as in multicellular
forms. Some of the fungus like mushroom, yeast etc. can be seen with naked eyes also.
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2.2 WHERE DO MICROORGANISMS LIVE?
Q. 1. How many cells are generally present per microorganism?
Ans. Microorganisms are generally single celled except algae.
2. 2. Name two habitats of mieroorganisms.
Ans. Water and soil.
Q. 3. Where do microbes grow?
Ans. Microbes grow on specific organisms and hosts. Some prefer to grow on flesh while
other prefers to grow on our intestines. Some may even grow freely in nature.
R. 4. Give two groups of microorganisms which live in colonies.
Ans. Bacteria, fungi.
Q. 5. How do you compare the number of microbes present in ponds and lakes
with those present in water obtained from deep wells or hand pumps?
Ans. The water of ponds and lakes contain large amount of microorganisms in comparison
to the water of hand pumps or deep wells.
2.3 MICROORGANISMS AND US
2. 1. Is it true that microbes are essential part of our life?
Ans. It is true that microbes are essential part of our life. Our important organisms li
nose, throat, mouth, and intestines are inhabitated by a large number of microbes.
2.2. Explain whether microorganisms are our friends or foe?
Ans. Microorganisms play an important role in our lives. Some of them are bene
in many ways whereas some others are harmful and cause diseases. Thus bacteria are
friend and foe
23. How are blue green algae and bacteria useful in fertility of soil?
Ans. Some bacteria and blue green algaes are able to fix nitrogen from the atmo
to enrich soil with nitrogen and increase its fertility. These microbes are commonly
biological nitrogen fixers.​

Answer 1

Answer:

Friend is Friend

Foe is enemy

I m Your friend plz mark me brainliest