Class 8 science chapter 1 question 37-39

37. Question
Explain the drip system of irrigation. State two advantages of the drip
system of irrigation.
Answer
In this system, there is a network of narrow pipes with small holes, in
the ϐields. When water ϐlows through these pipes, water falls drop by
drop just at the position of the roots. So, it is called drip system. Water
is not wasted at all. It is the best technique for watering fruit plants,
gardens and trees.
Advantages:
(i) Drip system is very useful in those regions where availability of
water is poor.
(ii) Drip system provides water to plants drop by drop. So, water is not
wasted at all.
38. Question
How do the irrigation requirements of a wheat crop differ from that of a
paddy crop ?
Answer
Each crop needs a speciϐic amount of water during its various stages of
its growth. The irrigation requirements depend on the nature of crop.
Some crops like need more water whereas other crops require less
water. For example, paddy crop requires continuous irrigation whereas
wheat crop requires less water.
39. Question
Explain why, the frequency of irrigation of crops is higher in summer season. 
Answer
The frequency of irrigation of crops is higher in summer season due to
the increased rate of evaporation of water from the soil and the leaves.


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