Holiday Home Work - Math, Physics, Chemistry, Biology, Computer, English Worksheets - Class Viii - 2013 Page 5
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1523.
What is the fabric used in making your school uniform shirt? Why do you think this fabric has been
chosen?
24.
Should the handle and bristles of a toothbrush be made of the same material? Explain your answer.
25.
Plastics are versatile in nature. Comment.
25.
Kabadiwala refuses to take old T.V. sets, telephones and broken electrical switches. Why?
26.
Plastics and metals are known to be potential soil pollutants. Explain why, giving reasons.
27.
Name 1 thermosetting plastic which is a good insulator, used to make plugs and switches.
28.
Which property of nylon is utilized in making socks and stockings?
29.
What is petroleum refining?
30.
How does recycling of thermoplastics limit its usage?
Biology
CROP PRODUCTION AND MANAGEMENT
Q1)Define_____a) Crops b)Manures c)Fertilisers d)Irrigation e)Animal
Husbandry
Q2)Why is soil made loose before sowing seeds?
Q3)What is the need of replenishing the soil ? How is it done?
Q4)What is Rhizobium ?Write its importance?
Q5)How is manure made?What is its importance over fertilisers ?
Q6)Name three fertilisers and the nutrients supplied by them ?
Q7)What happens if fertilisers are used in excess ?
Q8)Name the implements used in sowing seeds ,ploughing and harvesting?
Write their functions ?
Q9)Why is irrigation necessary for crops ?How is it done ?Which method is better
and why ?
Q10)What are Weeds ?Why should they be removed ?How are they
removed?What are weedicides ?
Q11)Name the harvest festivals of India?
Q12)What happens if the grains are not stored properly?Name few enemies of
crops and harms caused by them ?
Q130How should grains be stored?
Q14)Why is selection of seeds important?
Q15)Write five foods and their sources(animals and plants)
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Page 5
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