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प्रश्न
Write the characteristics of viruses.
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उत्तर
The various characteristics of viruses are:
- They are smaller and simpler than bacteria.
- They are ultramicroscopic and visible only under an electron microscope.
- They are considered to be on the boundary line of living and non-living things.
- They are obligate parasites and cannot live on their own.
- They cannot multiply on their own. They require living machinery to multiply.
- Viruses consist of genetic materials (DNA or RNA) surrounded by a protective coat of protein (capsid).
- Viruses are responsible for causing many dreadful diseases in plants, animals, and humans.
संबंधित प्रश्न
Find out my partner:
| A | B |
| Fungi | Chlorella |
| Protozoa | Bacteriophage |
| Virus | Candida |
| Algae | Amoeba |
| Bacteria | Prokaryotic |
Who am I?
I have a nucleus and membrane-bound cell organelles.
Draw a neat and labelled diagram.
Different types of bacteria.
Complete the following conceptual picture:
Microorganisms are measured in _______.
Mark the correct one as:
Assertion: Malaria is caused by Protozoa.
Reason: The disease is transmitted by mosquito.
Match the names of scientists given in Column A with the discovery made by them given in Column B.
| Column A | Column B |
| (a) Louis Pasteur | (i) Penicillin |
| (b) Robert Koch | (ii) Anthrax bacterium |
| (c) Edward Jenner | (iii) Fermentation |
| (d) Alexander Fleming | (iv) Small pox vaccine |
| (v) Typhoid |
Yeasts are a rich source of ______.
Vaccines stimulate the body to produce ______ against the ______ in the microbes.
Assertion: Bacillus Thuringiensis is a biocontrol agent.
Reason: It produces a protein called ‘cry protein’ which kills insect larva.
