What will happen when raisins are kept in water ?

Answer

### Step-by-Step Solution:

1. **Understanding the Subject**: Raisins are dried grapes, which means they have lost a significant amount of their water content. This makes them shriveled and small.

2. **Placing Raisins in Water**: When raisins are placed in water, they are exposed to a liquid environment that has a higher concentration of water compared to the inside of the raisins.

3. **Osmosis Process**: The process that occurs when raisins are kept in water is called osmosis. Specifically, it is a type of osmosis known as endosmosis.

4. **Endosmosis Explained**: Endosmosis refers to the movement of water molecules from an area of higher concentration (the water outside the raisins) to an area of lower concentration (the inside of the raisins).

5. **Result of Endosmosis**: As water enters the raisins, they start to swell up. This is because the water molecules are moving into the cells of the raisins, causing them to rehydrate and expand.

6. **Conclusion**: Therefore, when raisins are kept in water, they swell up due to the process of endosmosis, which allows water to enter the cells of the raisins.