class 9 science chapter 8 useful and harmful microbes question answer| std 9 science ch 8 Exercise
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9th Std science chapter 8 useful and harmful microbes question answer
class9 science ch 8 Exercise
Std9th std science Chapter 8 question answer
Class 9 science chapter 8 question answer
Exercise class 9 science chapter 8 useful and harmful microbes question answer
Class 9 science chapter 8 exercise
Class 9 science chapter 8 exercise question answer
Class9 science chapter 8 question answer
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Science and Technology English
Exercises
1. Complete the statements using the
proper option from those given
below. Explain the statements.
(mycotoxins, budding, rhizobium)
a. Yeast reproduces asexually by the
method.
b. Toxins of fungal origin are called
c. Leguminous plants can produce
more proteins due to...............
2 Write the names of microbes found
in following food materials.
yoghurt, bread, root nodules of
leguminous plants, idli, dosa, spoiled
potato curry.
3. Identify the odd word out and say
why it is the odd one?
a. Pneumonia, diphtheria, chicken
pox, cholera.
b.
Lactobacilli, rhizobia,
clostridia.
yeast,
c. Root rot, rust (tambera), rubella,
mozaic.
4. Give scientific reasons.
a. Foam accumulates on a the surface
of 'dal' kept for a long time in
summer.
b. Why are naphthalene balls kept with
clothes to be put away.
5. Write down the modes of infection
and the preventive measures against
fungal diseases.
6. Match the pairs.
'A' group
1. Rhizobium
2. Clostridium
3. Penicillium
4. Yeast
'B' group
a. Food poisoning
b. Nitrogen fixation
c. Bakery products
d. Production of
antibiotics
7. Answer the following questions.
a. Which vaccines are given to
infants? Why?
b. How is a vaccine produced?
c. How do antibiotics cure disease?
d. Are the antibiotics given to humans
and animals the same? Why?
e. Why is it necessary to safely store
the pathogens of a disease against
which vaccines are to be produced?
8. Answer the following questions in
brief.
a. What are 'broad
antibiotics?
b. What is fermentation?
c. Define 'Antibiotic'.
Activity:
spectrum
Collect information about generic
medicines and discuss them in the
class.
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