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प्रश्न
Which are the different types of micro-organisms?
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उत्तर
Microorganisms can be divided into 5 major groups, like:
Bacteria are the most primitive and diverse unicellular organisms found in the living world. They are prokaryotic in nature as their genetic material, i.e., DNA, is not enclosed within a nuclear membrane. Because of their unique biochemical pathways and properties, they are of high economic importance to human beings.
Fungi: Fungi is a group of eukaryotic, unicellular, as well as multicellular, non-photosynthetic organisms that includes mushrooms, moulds and yeasts. These organisms have a rigid cell wall made up of chitin and are found in diverse shapes and sizes.
Algae: Algae are a diverse group of aquatic organisms that have the ability to conduct photosynthesis.
Protozoa: Protozoa are a group of unicellular micoorganisms that are non photosynthetic in nature. Many protozoa cause disease in animals and humans.
Viruses: Viruses are ultramicroscopic and non-cellular organisms. They have a simple structure, having genetic material coated by a protein coat. They are obligate parasites and highly pathogenic.
संबंधित प्रश्न
Microorganisms can be seen with the help of a _________.
Can microorganisms be seen with the naked eye? If not, how can they be seen?
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 | ||
Write the characteristics of viruses.
Who am I?
I am green, but don't have organs.
Draw a neat and labelled diagram.
Bacteriophage.
Give reasons.
A refrigerator is used in almost every home.
What are the main features of a microorganism?
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 |
