SUB - SCIENCE CLASS 8 MM: 30
MCQ’s [5]
1.Yeast is used in the production of
a). Sugar
b). alcohol
c). Hydrochloric acid d). Oxygen
2.The following is an antibiotic
a). Sodium bicarbonate b). Streptomycin
c). Alcohol d). Yeast
3.Carrier of malaria causing protozoan
a). Anopheles
b). Cockroach
c). housefly d). butterfly
4.The process of conversion of sugar into
alcohol is called
a). nitrogen fixation b). Moulding
c). fermentation d). infection
5.The bread or idli dough rises because of
a). ant b). heat
c). growth of yeast cells d). kneading
FILL IN THE BLANKS [5]
1.Alcohol is produced with the help of
___________
2.Cholera is caused by ________
3.Blue green algae fix ________ to enhance the fertility of soil.
4.The first step before growing crops is
________ of the soil.
5.Damaged seeds would _________ on the surface
of water.
MATCH THE COLUMN [5]
i.
Bacteria fixing nitrogen
ii.
Rhizobium setting of curd
iii.
Lactobacillus baking of bread
iv.
Yeast causing
malaria
v.
A protozoan causing cholera
TRUE OR FALSE [5]
1.Separation of grains from the chaff is called
ginning.
2.Harvesting is the cutting of immature crops.
3.Winnowing is a step of cultivating crops.
4.Blue green algae fixes phosphorous to the plants.
5.Providing water to crops is called irrigation.
SHORT ANSWER TYPE QUESTIONS [2 marks each]
1.What are weeds?
2.Give two examples each of kharif and rabi
crops?
3.write few lines about threshing?
4.Give four examples of common preservatives
used at home?
5.What are antibiotics?
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