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ii.
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The process of separating grain from chaff and hay with the help of wind.
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iii.
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The removal of anthers from the flowers of a plant to prevent self pollination.
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iv.
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The process of transfering the seedlings from the nursery to the main field by hand.
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v.
|
Machine used to remove honey from honey comb.
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vi.
|
The rearing of bees for obtaining honey.
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vii.
|
Scientist who invented the dry cell.
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viii.
|
Another name of blue green algae.
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ix.
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The process by which yeast reproduces.
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x.
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A fungi used as a food.
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3.
|
Give reasons:
|
2 x 5 = 10
|
|
i.
|
Virus particle not considered to be a cell. Why?
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ii.
|
We use iron for making an electromagnet and not steel. Why?
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iii.
|
Farmers carry out lavelling of the ploughed field. Why?
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iv.
|
Weeds multiply and spread very fast. Why?
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v.
|
A person having acidity is given milk of magnesia. Why?
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4.
|
Answer the following questions:
|
2 x 5 = 10
|
|
i.
|
What js pisiculture? How are fish reared by pisiculture?
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|
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ii.
|
Give two broad groups of cattle feed. Give their constitutions.
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iii.
|
What are the two types of crops based on seasons? Give two examples for both.
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|
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iv.
|
What is meant by electromagnetic induction? Name the two scientists discovered the effect of it.
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v.
|
What are mycoplasmas? Name two diseases caused by mycoplasmas.
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5.
|
Difference between the following pair with example:
|
2 ½ x 4 = 10
|
|
i.
|
Manure and fertiliser
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|
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ii.
|
Dry cell and storage cell
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|
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iii.
|
Conductors and insulators
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|
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iv.
|
Gram positive and Gram negative bacteria.
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6.
|
Define following with diagram (any four)
|
2 ½ x 4 = 10
|
|
i.
|
Electromagnet
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|
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ii.
|
Magnetic compass
|
|
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iii.
|
Electric circuit
|
|
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iv.
|
Protozoan
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|
|
v.
|
Yeast
|
|
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7.
|
Answer any two of following questions:
|
5 x 2= 10
|
|
i.
|
You are given two similar steel bars, one of which is a magnet. What else would you require to test which of the given steel bar is a magnet?
|
|
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ii.
|
What are the various types of bacteria? Give shape and one example of each.
|
|
|
iii.
|
How will you find out whether an egg is
(a) fertilised or unfertilised?
(b) spoiled or good eggs?
|
|
|
8.
|
Give the answer of the following:
|
|
|
i.
|
Name two high yielding breeds/varities of the following:
(a) Cow (b) Buffalo (c) Hen (d) Wheat (e) Paddy.
|
1 x 5 = 5
|
|
ii.
|
Write the full form of the following:
(a) KVIC (b) DDT (c) BHC (d) TMV (e) RNA.
|
1 x 5 = 5
|
|
iii.
|
Name the types of chemical reactions:
|
1 x 5 = 5
|
|
a)
|
$mathrm{NH}_{3}+mathrm{HCl} rightarrow mathrm{NH}_{4} mathrm{Cl}$
|
|
|
b)
|
$mathrm{CaCO}_{3} rightarrow mathrm{CaO}+mathrm{CO}_{2}$
|
|
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c)
|
$mathrm{Fe}+mathrm{CuSO}_{4} rightarrow mathrm{FeSO}_{4}+mathrm{Cu}$
|
|
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d)
|
$mathrm{NaOH}+mathrm{HCl} rightarrow mathrm{NaCl}+mathrm{H}_{2} mathrm{O}$
|
|
|
e)
|
$mathrm{CuO}+mathrm{H}_{2} rightarrow mathrm{Cu}+mathrm{H}_{2} mathrm{O}$
|
|
|
iv.
|
Name the disease causing microorganism:
(a) Food poisoning (b) AIDS (c) Measles
(d) Sleeping sickness (e) Ring worm.
|
1 x 5 = 5
|
|
v.
|
Draw the electric symbol of the following:
(a) Dry cell (b) Battery (c) Electric bulb
(d) Switch open (e) Connecting wire.
|
1 x 5 = 5
|
|
vi.
|
Draw anyone labelled diagram:
(a) Fractionating Tower (b) Dry cell
|
2 ½ x 2 = 5
|
