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प्रश्न
Give reasons.
A refrigerator is used in almost every home.
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उत्तर
A refrigerator is used in almost every home because it prevents the spoilage of food. Refrigerator provides an optimum environment for storage of vegetables, fruits, and cooked and uncooked food. If an optimum temperature is not provided, it can lead to the growth of bacteria and fungi, thus leading to spoilage of food.
संबंधित प्रश्न
Alcohol is produced with the help of _________.
Can microorganisms be seen with the naked eye? If not, how can they be seen?
State whether the following statement is true or false. Explain your statement.
Tomato wilt is a viral disease.
Draw a neat and labelled diagram.
Bacteriophage.
What are micro-organisms?
Microorganisms are measured in _______.
How disease causing microorganisms enter into human beings?
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 |
Assertion: Bacillus Thuringiensis is a biocontrol agent.
Reason: It produces a protein called ‘cry protein’ which kills insect larva.
Name the scientist who first discovered the penicillin antibiotic. Can you name any other known antibiotic?
