Grapes immersed in water would shrink if

Options

A. water containing a good amount of salts
B. water containing starch
C. water is cold
D. water is hot.

Answer

To solve the question "Grapes immersed in water would shrink if...", we need to analyze the effects of different solutions on the grapes, particularly focusing on the concept of osmosis.

### Step-by-Step Solution:

1. **Understanding Osmosis**:
- Osmosis is the movement of water across a semi-permeable membrane from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration).

2. **Analyzing the Options**:
- **Option A**: If there is a good amount of salt in the water.
- When grapes are placed in salt water, the concentration of solute (salt) outside the grape is higher than inside the grape. This causes water to move out of the grape to balance the solute concentrations, leading to the grapes shrinking.

- **Option B**: If there is starch in the water.
- Starch is a type of carbohydrate, and if it is present in the water, it will not create a significant difference in solute concentration compared to the sugars inside the grapes. Therefore, there would be no net movement of water, and the grapes would not shrink.

- **Option C**: If the grape is immersed in cold water.
- Cold water does not create a higher solute concentration outside the grape. Therefore, there would be no significant movement of water out of the grape, and it would not shrink.

- **Option D**: If the grape is immersed in hot water.
- Similar to cold water, hot water does not create a higher solute concentration outside the grape. While temperature can affect the rate of osmosis, it does not directly cause the grapes to shrink.

3. **Conclusion**:
- The only condition under which grapes would shrink when immersed in water is if the water contains a good amount of salt (Option A). This creates a hypertonic environment outside the grape, causing water to exit the grape through osmosis.

### Final Answer:
**Grapes immersed in water would shrink if there is a good amount of salt in the water (Option A).**