Method: 1 Mark
Reason: 1 Mark
The best way to remove the Horlicks clumps is through filtration. While filtering the Horlicks solution, the powder clumps remain with the filter paper.
We choose filtration because Horlicks is a solution since it dissolves in milk. The dissolved particles of Horlicks go through the filter paper along with milk, and the undissolved portion remains on the filter paper, getting us exactly what we need.

Reason: 1 Mark
Process name: 1 Mark
Mechanism: 1 Mark
By beating bundles of wheat, the farmer is trying to free the grain seeds from the stalks and this process is known as threshing.
Grains are attached at the weakest links of the stalk. As bundles of stalks are beaten, grains detach from the stalk and fall apart.
Threshing can be performed manually or with the help of machines.

Sedimentation: 1 Mark
Decantation: 1 Mark
The process of separating insoluble substances which are heavier than liquid by allowing them to settle down on their own due to gravity is called sedimentation. 
In decantation, the clear upper liquid is poured out from the container without disturbing the sediment.

Addition of ice: 1 Mark
Dissolving more sugar: 1 Mark
Solubility of different substances: 1 Mark
More salt: 1 Mark
Other water soluble things: 1 Mark
The sugar should be added before the ice.
We can dissolve more sugar in warm water since sugar dissolves in warm water more quickly than in cold water. So it's better to add the ice after adding sugar.
Water does not dissolve equal amounts of different substances. It will dissolve different amounts of salt and sugar.
To dissolve more salt in a saturated solution of salt and water, the salt solution can be heated to make room for more salt particles to dissolve.
Other water soluble things include coffee and soap.

Explanation: 1 Mark each
1. She can separate the two easily by using the method of winnowing.
2. The method of winnowing is based on the principle that the lighter particles will be blown away when air is blown through the mixture.
3. The mixture is taken to an open ground and is held while standing on a raised platform. The mixture is put on a plate or a sheet of paper. The plate or sheet of paper containing the mixture is held at shoulder level. It's slightly tilted downward so that the mixture slowly starts sliding out.
4.The plate is moved upwards and downwards in the air so that the mixture falls to the ground.
5. The dried leaves will scatter out because they are lighter and are carried away by the wind. The wheat forms a separate heap on the ground. Hence the two components are separated.

Method of separation: 1 Mark
Explanation: 1 Mark
Example: 1 Mark
The method of separation being used here is sieving in this case.
Sieving is used to separate substances that are of different sizes. In this method, a sieve is used. The smaller components of the mixture can pass through the pores of the sieve whereas bigger components of the mixture are retained by the sieve.
For example, wheat flour has some finely powdered wheat as well as some bigger impurities. When this flour is put through a sieve, the fine powder falls through the small holes in the sieve, while the thicker impurities remain as they are too big for these holes. And hence, the substances are separated from the mixture. 

Statement: 1 Mark
Explanation: 1 Mark
Use of decantation: 1 Mark
No, we cannot remove the ink from the water through decantation, since the mixture of ink and water forms a solution.
In the solutions, the particles are evenly mixed around, and will not form sediments. 
Decantation can be used for a mixture of two liquids which are not soluble into each other and forms distinct layers or it can be used to separate the components of a  solid-liquid mixture in which the solid particles settles at the bottom and the clear liquid above it can be poured into another container.

Explanation: 1 Mark each
We can separate them in various ways.
1. The mixture is taken and put into a beaker of water.
After a few seconds of stirring, since sugar is soluble in water, the sugar will dissolve into the water. 
2. If the mixture is now left undisturbed for a few hours, the leftover pebbles from the mixture will form a sediment on the bottom of the beaker. 
The top layer of clean water is transferred into another beaker.
3. We can also use filtration to remove the stones from the beaker instead of waiting for it to form a sediment.
4. The new solution is now heated to a boil and left to evaporate. After the water has evaporated, the sugar will remain behind in the beaker.
Thus the sugar and the stones are removed. 
5. So while separating sugar from the stones, the various processes involved are sedimentation/filtration, decantation, and evaporation.

Filtration helps to remove the suspended impurities. The mixture which contain insoluble solid particles suspended in a liquid are passed through a filter paper. The filter paper has minute pores that trap the solid particles. 
In the given example, the size of tea leaves are large enough, so they can be easily separated from the prepared tea by filtration.

Heating the solution increases the solubility of solute in it. In other words, on heating more amount of a substance can be dissolved in the same solution. For example, more amount of sugar can be dissolved in hot water as compared to water at room temperature.