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my document is all about extra question and answers of science chapter 1 of class 8 and important points and clearly defination of word ......
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1.CROP PRODUCTION AND MANAGEMENTNOTES:-
Crop: Plants of same kind are cultivated at one place on a
large scale is said to be crop
-> There are two types of crops:
[i] Kharif crops: The crops which are sown in the rainy
season are called Kharif crops. These crops are generally
grown from June to September in India.
e.g- Paddy, Maize, Soyabean, Groundnut and cotton.
[ii] Rabi crops: The crops which are grown in the winter
season are called Rabi crops. These crops are generally
grown from October to march in India.
e.g- Wheat, Gram, Pea, Mustard and Linseed.
Q. why paddy can’t be grown in the winter season?
ANS. Paddy can’t be grown in the winter season because
paddy requires a lot of water. Therefore, it is grown in the
rainy season.
Q. Write down the seven agricultural practices.
ANS. The seven agricultural practices are given below:
[i] Preparation of soil
[ii] Sowing
[iii] Adding manure and fertiliser
[iv] Irrigation
[v] Protecting from weeds
[vi] Harvesting
[vii] Storage
Q. Why is it important to loose the soil?
ANS. It is important to loosen the soil because this allows the
roots to penetrate deep into the soil and the loosen soil
, allows the roots to breathe easily even when they go deep
into the soil.
Q. Why does the loosening of soil allows the roots to breathe
easily?
ANS. The loosening of soil allows the roots to breathe easily
because they helps in the growth of earthworms and
microbes present inn the soil and they further turn and loosen
the soil and add humus to it.
Ploughing: The process of loosening and turning of the soil
is called tilling or ploughing.
Crumbs: The ploughing field may have big clumps of soil
called crumbs.
Plough: The device which is used for tilling the soil, adding
fertilisers to the crops, removing the weeds and turning the
soil.
Hoe: It is a simple tool which is used for removing weeds and
for loosening the soil.
Cultivator: Nowadays, ploughing is done by tractor – driven
cultivator. The use of cultivator saves labour and time.
Q. Why does some seed float on the water?
A. Some seeds float on the water because those are damaged
seeds which become hollow and are thus, lighter. Which
cause them to float over water through this method we can
separate good and healthy seeds from the demaged seeds.
Traditional tool: The tool used traditionally for sowing seeds
are called traditional tools.
Seed drill: Nowadays, the seed drill is used for sowing with
the help of tractors.
Q. What are the benefits of using Seed drill?
ANS. The benefits of using seed drill are:
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