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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
Carrier of malaria-causing protozoan is ___________.
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 |
Match the pairs
| ‘A’ group | ‘B’ group | ||
| a. | Xylitol | 1. | Pigment |
| b. | Citric acid | 2. | To impart sweetness |
| c. | Lycopene | 3. | Microbial restrictor |
| d. | Nycin | 4. | Protein binding emulsifier |
| 5. | To impart acidity | ||
Who am I?
I have a nucleus and membrane-bound cell organelles.
Who am I?
I reproduce mainly by cell division.
Who am I?
I can produce my replica.
Draw a neat and labelled diagram.
Bacteriophage.
Give reasons.
A refrigerator is used in almost every home.
How disease causing microorganisms enter into human beings?
Unscramble the jumbled word underlined in the following statement.
Cells of our body produce santiidobe to fight pathogens
