Fill in the blanks:
(a) The method of separating the seeds of paddy from their stalks is called ______.
(b) When milk, cooled after boiling, is poured onto a piece of cloth, the cream (malai) is left behind on it. This process of separating cream from milk is an example of ______.
(c) Salt is obtained from sea water by the process of ____________ .
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called ____________.
(a) The method of separating the seeds of paddy from their stalks is called threshing.
(b) When milk, cooled after boiling, is poured onto a piece of cloth, the cream (malai) is left behind on it. This process of separating cream from milk is an example of filtration.
(c) Salt is obtained from seawater by the process of evaporation.
(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The processes of separation used in this example is called sedimentation and decantation.
[Explanation: Threshing is the process of loosening the edible part of the grain or seeds (or other crops) from the straw and chaff to which they are attached. It can be done manually by beating it on a solid surface or by using a threshing machine.
Filtration is a physical separation process that separates solid matter and fluid from a mixture using a filter medium like filter paper or muslin cloth.
Evaporation is the process by which liquid changes into its vapor form on heating.
Sedimentation is the process in which heavier particles of an insoluble solid settle down in a liquid.
Decantation is the process of pouring out the liquid without disturbing the sediment.]
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