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प्रश्न
What are micro-organisms?
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उत्तर १
There are countless -living organisms on the earth. Of these, the organisms which cannot be seen with our eyes but can only be observed under a microscope are called micro-organisms.
उत्तर २
Living organisms which are not visible to the naked eye are known as micro-organisms. They are living organisms that can be seen only with a microscope or a magnifying glass. Microorganisms were observed for the first time by Anton von Leeuwenhoek in 1674, using a microscope of his own.
संबंधित प्रश्न
Alcohol is produced with the help of _________.
Match the organisms in Column A with their action in Column B.
| A | B | ||
| (i) | Bacteria | (a) | Fixing Nitrogen |
| (ii) | Rhizobium | (b) | Setting of curd |
| (iii) | Lactobacillus | (c) | Baking of bread |
| (iv) | Yeast | (d) | Causing Malaria |
| (v) | A protozoan | (e) | Causing Cholera |
| (vi) | A Virus | (f) | Causing AIDS |
| (g) | Producing antibodies |
What are the major groups of microorganisms?
Arrange the following in ascending order of size Bacteria, Fungi, Viruses, Algae.
Give reasons.
A refrigerator is used in almost every home.
Unscramble the jumbled word underlined in the following statement.
Cells of our body produce santiidobe to fight pathogens
While returning from the school, Boojho ate chaat from a street hawker. When he reached home, he felt ill and complained of stomach ache and fell ill. What could be the reason?
The major constituent of vinegar is ______.
Yeasts are a rich source of ______.
Assertion: Bacillus Thuringiensis is a biocontrol agent.
Reason: It produces a protein called ‘cry protein’ which kills insect larva.
