. (a) Name two diseases that are caused by virus.
(b) Write one important characteristic of virus.
What will happen to ‘pooris’ and ‘unused kneaded flour’ if they
are left in the open for a day or two?
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?
. Paheli watched her grandmother making mango pickle. After
she bottled the pickle, her grand mother poured oil on top of the
pickle before closing the lid. Paheli wanted to know why oil was
poured? Can you help her understand why?
Polio drops are not given to children suffering from diarrhoea.
Why?
Why should we avoid standing close to a tuberculosis patient
while he/she is coughing?
In the soil, which nutrient is enriched by blue-green algae
(cyanobacteria)?
Suggest a suitable word for each of the following statements.
(a) Chemicals added to food to prevent growth of microorganisms.
(b) Nitrogen-fixing microorganism present in the root nodules
of legumes.
(c) Agent which spreads pathogens from one place to another.
(d) Chemicals which kill or stop the growth of pathogens.
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