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प्रश्न
What are micro-organisms?
उत्तर
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
State whether the following statement is true or false. Explain your statement.
Tomato wilt is a viral disease.
Write the characteristics of viruses.
Who am I?
I have a nucleus and membrane-bound cell organelles.
Who am I?
I reproduce mainly by cell division.
Complete the following conceptual picture:
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 |
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?
Assertion (A): Boiling milk is a method of preservation.
Reason (R): Probiotic is a method of preserving milk.
Yeasts are a rich source of ______.
Name the scientist who first discovered the penicillin antibiotic. Can you name any other known antibiotic?
