Class 8 Science - Chapter Crop Production and Management NCERT Solutions | Write a paragraph in your own words on e
Write a paragraph in your own words on each of the following.
(a) Preparation of soil (b) Sowing
(c) Weeding (d) Threshing
- Preparation of soil: The steps which are taken by a farmer before sowing are collectively known as preparation of soil. It involves tilling or ploughing, levelling and manuring. It bring the nutrients rich soil to the top so that plants can use these nutrients.
- Sowing: The process of putting seeds in the prepared soil is called sowing. It is the most important and precious part of the crop production. Before sowing, the healthy and good quality of seeds are selected. The seeds should be sown at appropriate distances and depth. Seed drill is the best method of sowing seeds in the fields.
- Weeding: The removal of unwanted plants that grow along with crop plants is called weeding. It is necessary since weeds complete with the crop plants for water, nutrients and light. Hence, they affect the growth of the plant or crop. Some weeds may be poisonous or harmful for animals and human beings.
- Threshing: The process of separating the grain seeds from the chaff is called threshing. Threshing is carried out with the help of a machine called ‘combine’ which is infact a harvester as well as a thresher.
More Questions From Class 8 Science - Chapter Crop Production and Management
- Q:-
Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
- Q:-
Complete the following word puzzle with the help of clues given below.
Down
1. Providing water to the crops.
2. Keeping crop grains for a long time under proper conditions.
5. Certain plants of the same kind grown on a large scale.Across
3. A machine used for cutting the matured crop.
4. A rabi crop that is also one of the pulses.
6. A process of separating the grain from chaff.
- Q:-
If wheat is sown in the kharif season, what would happen? Discuss.
- Q:-
Explain how fertilisers are different from manure.
- Q:-
Match items in column A with those in column B.
A B
(i) Kharif crops (a) Food for cattle
(ii) Rabi crops (b) Urea and super phosphate
(iii) Chemical fertilisers (c) Animal excreta, cow dung urine and plant waste
(iv) Organic manure (d) Wheat, gram, pea
(e) Paddy and maize - Q:-
Give two examples of each.
(a) Kharif crop
(b) Rabi crop - Q:-
Explain how soil gets affected by the continuous plantation of crops in a field.
- Q:-
What is irrigation? Describe two methods of irrigation which conserve water.
- Q:-
What are weeds? How can we control them?
- Q:-
Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation(a) The same kind of plants grown and cultivated on a large scale at a place is called _____________.
(b) The first step before growing crops is _____________ of the soil.
(c) Damaged seeds would _____________ on top of water.
(d) For growing a crop, sufficient sunlight and _____________ and _____________ from the soil are essential.
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Which of the following can be beaten into thin sheets?
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Fill in the blanks
(a) Most liquids that conduct electricity are solutions of , ______________ and ______________.
(b) The passage of an electric current through a solution causes ______________ effects.
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(d) The process of depositing a layer ofany desired metal on another material by means of electricity is called . - Q:-
Give two examples each of situations in which you push or pull to change the state of motion of objects.
- Q:-
Fill in the blanks:
(a) Friction opposes the _____________ between the surfaces in contact with each other.
(b) Friction depends on the _____________ of surfaces. (c) Friction produces __________.
(d) Sprinkling of powder on the carrom board ________ friction.
(e) Sliding friction is ___________ than the static friction. - Q:-
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Indicate whether the following statements are True (T) or False (F).
(a) Unicellular organisms have one-celled body. (T/F)
(b) Muscle cells are branched. (T/F)
(c) The basic living unit of an organism is an organ. (T/F)
(d) Amoeba has irregular shape. (T/F) - Q:-
Which of the following cannot be charged easily by friction?
(a) A plastic scale
(b) A copper rod
(c) An inflated balloon
(d) A woollen cloth. - Q:-
Fill in the blanks:
(a) A place where animals are protected in their natural habitat is called .
(b) Species found only in a particular area is known as .
(c) Migratory birds fly to far away places because of changes. - Q:-
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.
- Q:-
What are the different ways in which water gets contaminated ?
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- Q:-
Fill in the blanks:
(a) Friction opposes the _____________ between the surfaces in contact with each other.
(b) Friction depends on the _____________ of surfaces. (c) Friction produces __________.
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(a) Dholak (b) Sitar (c) Flute - Q:-
In the following statements, tick T against those which are true, and F against those which are false:
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(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of vibration is large, sound is feeble. (T/F)
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- Q:-
Fill in the blanks with suitable words.
(a) Time taken by an object to complete one oscillation is called ................... .
(b) Loudness is determined by the .........................of vibration.
(c) The unit of frequency is..........................
(d) Unwanted sound is called ......................... .
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