Answer: (a) microscope, (b) nitrogen, (c) yeast, (d) bacteria
Question 1: Yeast is used in the production of
Question 2: The following is an antibiotic
Question 3: Carrier of malaria-causing protozoan is
Question 4: The most common carrier of communicable diseases is
Question 5: The bread or idli dough rises because of
Question 6: The process of conversion of sugar into alcohol is called
|Column I||Column II|
|(a) Bacteria||(1) Fixing nitrogen|
|(b) Rhizobium||(2) Setting of curd|
|(c) Lactobacillus||(3) Baking of bread|
|(d) Yeast||(4) Causing malaria|
|(e) A protozoan||(5) Causing cholera|
|(f) A virus||(6) Causing AIDS|
|(g) Producing antibodies|
Answer: (a) → 5, (b) → 1, (c) → 2, (d) → 3, (e) → 4, (f) → 6
Question 1: Can microorganisms be seen with the naked eye? If not, how can they be seen?
Answer: Such organisms can be seen through microscope.
Question 2: What are the major groups of microorganisms?
Answer: The major groups of microorganisms are: bacteria, algae, fungi and protozoa
Question 3: Name the microorganisms which can fix atmospheric nitrogen in the soil.
Answer: Rhizobium, Blue-green algae
Question 4: Write 10 lines on the usefulness of microorganisms in our lives.
Answer: Usefulness of microorganisms:
Question 5: Write a short paragraph on the harms caused by microorganisms.
Answer: Many microorganisms are harmful for us. Some microbes enter our body and cause diseases. Some of the infectious diseases can be highly debilitating in nature. Some microbes infect cattle and poultry and thus cause heavy loss to us. Some microbes damage the crops. Microbes also spoil our food. For example; fruits, vegetables, meat, fish, milk, etc. can easily get spoiled due to microbes.
Question 6: What are antibiotics? What precautions must be taken while taking antibiotics?
Answer: A substance which kills or stops the growth of bacteria is called antibiotic. Following precautions need to be taken while taking antibiotics:
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