NCERT Solutions For Class 8 Science Chapter 2: Very Short Answer Questions
Question 1. An ingredient is added to idlis and bhatura to make them soft. What is it?
Answer: Curd is added to idlis and bhatura to make them soft.
Question 2. A gas is responsible for the increase in the volume of dough. Name it.
Answer: Carbon dioxide given out by yeast is responsible for the increase in volume of dough.
NCERT Solutions for Microorganisms Friend and Foe VSAQs
NCERT Solutions for Class 8 Science Microorganisms VSAQs
Question 3. Yeast is used for commercial purposes. Write one commercial use of yeast.
Answer: Baking bread is one of the commercial uses of yeast. It is also used in alcohol manufacturing.
Question 4. Name the process in yeast that converts sugar into alcohol.
Answer: Fermentation is the process by which yeast converts sugars into alcohol.
Question 5. Should antibiotics be used for cold and flu? Give a reason for your answer.
Answer: No, antibiotics should not be used in cold and flu because these diseases are caused by viruses and antibiotics are not effective against viruses.
NCERT Class 8 Science Chapter 2 Microorganisms VSAQs
Question 6. Vaccines are essential for what purpose? Mention two diseases for which vaccines are available.
Answer: A Vaccine is essential to protect all children against several diseases. Polio and hepatitis are two diseases for which vaccines are available.
Question 7. Where is the mode of transmission in the yellow vein mosaic of okra?
Answer: Yellow vein mosaic of okra is a viral disease transmitted by an insect.
Microorganisms Friend and Foe NCERT Solutions for VSAQs
Question 8. We add a little curd to warm milk to set the curd for the next day. Why?
Answer: Curd contains several microorganisms. Of these, the bacterium Lactobacillus promotes the formation of curd. It multiplies in milk and converts it into curd.
VSAQs of Chapter 2 Class 8 Science Microorganisms