The NCERT solutions for class 6 offered are arranged in an extremely efficient manner. Mirroring the order of chapters and topics in the textbooks, the answers give students the opportunity to explore the traditional or evident method of completing a question.
CBSE NCERT Solutions for Class 6 Science Chapter 4:
What is winnowing? Where is it used?
Winnowing is the process of separation of the heavier components from the lighter
components of a mixture by wind or by blowing air. This process is completely done by the wind. The heavier particles stay down whereas the husk particles jump away.
It is generally used by farmers to separate the lighter impurities such as husk particles from the cereals
How will you separate husk or dirt particles from a given sample of pulse before
The dirt particles that are present in the pulses are removed by washing the latter with water.
Being heavier, the pulses settle down, while the dirt particles being lighter keep floating in water.
This process is called sedimentation. The dirty water can be removed by the method of decantation, leaving the pulses at the bottom.
What is sieving? Where is it used?
Sieving is the method of separation of fine particles from bigger particles by allowing the finer particles to pass through the holes of a sieve, leaving the bigger particles in the sieve itself. It is generally used in homes to separate flour from impurities such as pieces of stone, stalk, and husk. It is also used at construction sites to separate sand from small stones.
Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Yes, it is possible to separate a mixture of sugar and what flour. This can be done by the process of sieving. If the mixture of sugar and wheat flour is allowed to pass through a sieve, then the fine wheat flour particles would pass through the sieve, the sugar particles would be retained by the sieve.