Answer:




The correct answer is option 'D', which is Winnowing. Winnowing is a separation technique based on the difference in weights of the solids in a solid-solid mixture. Let's understand the process of winnowing in detail.

What is Winnowing?
Winnowing is a method used to separate lighter impurities from heavier solids in a mixture. It is commonly used in agriculture to separate grains from chaff, husk, or dirt.

The Process of Winnowing:
1. Step 1: Collection of Mixture
The solid-solid mixture is collected in a winnowing basket or tray. This mixture usually consists of grains and other unwanted impurities like husk or chaff.

2. Step 2: Tossing the Mixture
The winnowing process involves tossing the mixture into the air. By doing so, the lighter impurities like husk or chaff are carried away by the wind, while the heavier grains fall back into the tray.

3. Step 3: Separation of Components
As the mixture is tossed, the wind carries away the lighter impurities due to their low weight. At the same time, the heavier grains fall back into the tray or basket. This separation occurs because the lighter impurities get blown away by the wind, whereas the grains are heavier and resist being carried away.

4. Step 4: Collection of Grains
After the tossing process, the separated grains are collected in the tray or basket, ready for further processing or use.

Advantages of Winnowing:
- It is a simple and inexpensive method of separation.
- It does not require any complex equipment or machinery.
- It can be easily done manually or with the help of simple tools.

Disadvantages of Winnowing:
- It is not suitable for separating mixtures with very small or similar-sized particles.
- It is dependent on wind or airflow, so it may not be effective in calm or indoor environments.

In conclusion, winnowing is a separation technique where the difference in weights of the solids in a solid-solid mixture is utilized to separate the lighter impurities from the heavier grains. It is a simple and effective method commonly used in agriculture for separating grains from chaff or husk.

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