Class 8 science chapter 1 question 31-33

Short Answer Type Questions
31 A. Question
Why is it is necessary to dry the harvested food grains before storage ?
Answer
The fresh crop has more moisture. So, the food grains obtained by
harvesting the crop are dried before storage. If freshly harvested food
grains are stored without drying, they may get spoilt or attacked by
organisms, losing their germination capacity.
31 B. Question
What are the two ways in which farmers store food grains ?
Answer
The farmers store food grains in jute bags and metal bins at home.
32. Question
Out of drip system and sprinkler system of irrigation, which one is more
suitable :
(a) for uneven land?
(b) for sandy soil?
(c) for watering fruit plants ?
(d) where availability of water is poor?
Answer
(a) Sprinkler system is more suitable for uneven land where sufϐicient
water is not available.
(b) Sprinkler system is very useful for sandy soil.
(c) Drip system is best technique for watering fruit plants, gardens and
trees.
(d) Drip system of irrigation is more suitable where availability of
water is poor.
33 A. Question
What are weeds? Name any one weed found in a crop ϐield.
Answer
The undesirable plants which grow along with a cultivated crop are
called weeds. Wild oat is a weed which is found in wheat crop ϐield.
33 B. Question
How do weeds affect the growth of crops?
Answer
Weed compete with the crop plants for water, nutrients, space and light.
Thus, they affect the growth of crops.

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