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SCIENCE
– II
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Time : 2 ½ Hours
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MARCH – 2000
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Marks : 60
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| Q.
1. |
A) |
Fill
in the blanks and rewrite the completed statements:
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3
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i) |
The
structure of under-nourished child is ----------- |
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ii) |
Losses of perishable foods are due to endogenous
---------- |
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iii) |
Nightblindness is due to deficiency of vitamin
---------- |
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B) |
Select the proper words from Group ‘B’
for the items in Group ‘A’ and rewrite the pairs:
| Group ‘A’ |
Group ‘B’ |
| i) Bone fluorosis |
a) Cholesterol |
| ii) Thickening of long bones |
b) Vitamin A |
| iii) Arteriosclerosis |
c) Fluorine |
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d) Vitamin D |
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e) Saturated fats |
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3
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C)
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Considering the relation between the group of words
from the first pair, write the correct word to match the third
word: |
1
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Metal : Reducing agent : : Non-metal : ………… |
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D) |
Select the odd man out: |
1
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Sugar, Salt, Oil, Baking Soda |
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E) |
Write whether the following statements are True
of False: |
2
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i) |
If
the snake population declines, the proportion of rats inclines. |
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ii) |
Losses of Roots and Tubers are lesser than the
losses of grains. |
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| Q.
2. |
A) |
Answer the following briefly (any Three): |
6
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i) |
Give
the constituents of petroleum. |
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ii) |
In
which of the following food chains man gets more energy? Why?
a)
Maize ® Man;
b)
Maize ® Goat ® Man. |
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iii) |
Give
two important functions of the following:
a. Proteins;
b. Vitamin C. |
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iv) |
Distinguish between metals and non-metals. |
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B)
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Attempt any Two of the following: |
4
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i)
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Draw
a neat labelled diagram to show electrolytic cell for refining
metals. |
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ii) |
Observe the following diagram of preparation of
Hydrogen Sulphide by Kipp’s apparatus and correct it
if necessary, redraw and label. |
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iii)
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Write down the effects of deficiency of vitamin
A, C, E and K. |
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| Q.
3. |
A) |
Give
the scientific reasons for any Three of the following: |
6
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i) |
Addiction of Tobacco should be avoided. |
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ii) |
Blood sugar level increases in diabetes. |
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iii) |
Sulphur dust is spread on fruit trees. |
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iv) |
Copper sulphate crystals on heating turn to white
powder. |
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v) |
The
existence of life on the earth depends on the sun. |
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B)
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How
is carbon dioxide gas prepared in the laboratory? Explain
with the help of a neat labelled diagram. |
4
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| Q.
4. |
A) |
Explain the following chemical reactions with the
help of balanced equations (any Three): |
6
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i) |
Piece of yellow phosphorus is heated with conc.
solution of potassium hydroxide. |
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ii) |
Sulphur is burnt in the air. |
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iii) |
Hydrogen sulphide gas is passed through an acidified
solution of copper sulphate. |
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iv) |
A
glass rod dipped in concentrated hydrochloric acid is introduced
in a gas jar of ammonia. |
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B) |
Answer any Two of the following: |
4
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i) |
Distinguish between Autotrophs ad Heterotrophs. |
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ii) |
Write four plant sources of Thiamine. |
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iii) |
Distinguish between saturated and unsaturated hydrocarbons. |
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| Q.
5. |
A) |
Answer any Three of the following: |
6
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i) |
Why
should an automobile vehicle be checked periodically? |
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ii) |
Write down the habits which spoil community hygiene. |
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iii) |
Name
two alloys of aluminium and write their constituents. |
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iv) |
Write four methods of concentration of ores. |
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B) |
What
are wastes? How are they classified according to their origin? |
4
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| Q.
6. |
A) |
Attempt any Three of the following: |
6
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i) |
Explain the losses of food due to traditional customs. |
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ii) |
Name
any four important minerals containing phosphorus. |
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iii) |
Define:a)
Communicable disease; b) Non-communicable disease. |
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iv) |
Why
is water called an universal solvent? |
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B) |
What
will happen if all the green plants disappear from the earth?
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4
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OR
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i) |
Write the effect of consumption of spoiled food
on health. |
2
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ii) |
What
are health hazards of air pollution on human life? |
2
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