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.
(a) Crop
Crop may be defined as the same kind of plants that are grown on the large scale.
(b) Preparation
Before growing crops, preparation of soil is done. In this process, turning and loosening steps of the soil is done. It allows the roots to penetrate deep into the soil.
(c) Float
The damaged seeds are light in weight. That is why they float on water whereas the fresh seeds are heavy in weight so they easily settle down in the bottom.
(d) Water and nutrients
For a health crop, we need a proper sunlight, water and nutrients. If the deficiency of these things occurs then the crop should be weak.
Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
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.
If wheat is sown in the kharif season, what would happen? Discuss.
Write a paragraph in your own words on each of the following.
(a) Preparation of soil (b) Sowing
(c) Weeding (d) Threshing
Explain how fertilisers are different from manure.
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
Give two examples of each.
(a) Kharif crop
(b) Rabi crop
Explain how soil gets affected by the continuous plantation of crops in a field.
What is irrigation? Describe two methods of irrigation which conserve water.
What are weeds? How can we control them?
Which of the following can be beaten into thin sheets?
(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen
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.
(c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the terminal of the battery.
(d) The process of depositing a layer ofany desired metal on another material by means of electricity is called .
Give two examples each of situations in which you push or pull to change the state of motion of objects.
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.
List conditions under which combustion can take place.
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)
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.
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.
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.
What are the different ways in which water gets contaminated ?
Prepare a brief speech on global warming that you have to make in your class.
In the following Table some substances are given in Column I. In Column II some uses are given. Match the items in column I with those in Column II.
Column I | Column II |
---|---|
(i) Gold (ii) Iron (iii) Aluminium (iv) Carbon (v) Copper (vi) Mercury |
(a) Thermometers (b) Electric Wire (c) Wrapping food (d) Jewellery (e) Machinary (d) Fuel |
List conditions under which combustion can take place.
List sources of noise pollution in your surroundings.
Explain how you can take care of your eyes.
Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.
Explain circumstances leading to acid rain. How does acid rain affect us?
Give examples to show that friction is both a friend and a foe.
Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.
Clear, transparent water is always fit for drinking. Comment.