Question

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5. Fill in the blanks:
a. Air is really not one substance but a .
b. The component of air that supports burning is called .
c. Method of making compost using is called vermin composting
d. Converting plant and animals wastes into manure is called .
e. is an area where the garbage is collected.
f. Water vapour gets added to air by and .
g. Excessive rains may cause while lack of it for long periods may cause ____________.
h. The water in the and is saline.
i. A change in state from gaseous to liquid is called______________.
j. Water exists in___________states.
k. Water covers______________of the earth’s surface.
l. Water helps to_____________the temperature of the body.
m. The major natural source of water is_______________.
n. Water disappears from wet clothes by the process of______________.
o. The source of water below the ground such as wells, tubewells, lakes etc. is known as___________________________.
p. In winter mornings , _______________is formed due to condensation of water vapour near the ground.
q. Many tiny water droplets high up in the air, come together and fall down a_____________________, ______________and_________________.

6. True or false:
a. Air is a compound but not an element.
b. Air is an opaque material.
c. Air contains water vapour.
d. The major part of air is Nitrogen.
e. Plants produce Oxygen through photosynthesis.
f. Paper can be recycled to get useful products.
g. Drains get choked due to plastic thrown by us.
h. Plastics are eco-friendly.
i. Plastics give out harmful gases up on heating or burning.
j. The removal of the upper layer of soil is called erosion of soil.
k. Life is possible on earth without water:
l. Saline water is fit for drinking and other domestic, agricultural and industrial needs.


7. Name the following

a. Two natural sources of water-
b. Two fresh water bodies -
c. Two rainwater harvesting techniques -
d. Four uses of water at home -
e. The two processes through which water vapour enters the air -
f. Two adverse effects of floods –

g. Two adverse effects of drought –

8. Write any five methods of water conservation.
a) …………………………………………………………………….
b) …………………………………………………………………….
c) ……………………………………………………………………..
d) …………………………

Answer 1

5a.oxides.

b.co2.
d.composting.
e.muncipality
f.rain.
g.drought.
k.3/4.
I. remain.
m.rain
n.sunlight
o.ground water.
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Answer 2

Answer:

5 ways to conserve water

Five measures adopted for conservation of water resources are. (i) Construction of multi-purpose projects and canals. (ii) Solving river water disputes quickly. (iii) Inter-basin transfer of water. (iv) Measures to raise underground water table.