Statement 1: In plants, the tonoplast facilitates the transport of a number of ions and other materials against concentration gradients into the vacuole.
Statement 2: In amoeba, the contractile vacuole is important for osmoregulation and excretion.

Options

A. Both statement 1 and 2 are correct
B. Statement 1 is incorrect and statement 2  ,is correct
C. Statement 1 is correct and statement 2 is incorrect
D. Both statement 1 and 2 are incorrect

Answer

To analyze the given statements, we will break down each statement step by step.

### Step 1: Analyze Statement 1
- **Statement 1**: "In plants, the tonoplast facilitates the transport of a number of ions and other materials against concentration gradients into the vacuole."
- The tonoplast is the membrane surrounding the vacuole in plant cells.
- It plays a crucial role in maintaining the internal environment of the vacuole by regulating the transport of ions and other substances.
- The tonoplast uses energy (ATP) to transport ions such as calcium, nitrate, and potassium against their concentration gradients.
- This active transport helps maintain osmotic pressure within the vacuole, which is vital for cell turgor and overall plant health.

**Conclusion for Statement 1**: This statement is correct.

### Step 2: Analyze Statement 2
- **Statement 2**: "In amoeba, the contractile vacuole is important for osmoregulation and excretion."
- The contractile vacuole is an organelle found in freshwater protists like amoeba.
- Its primary function is to manage water balance (osmoregulation) by collecting excess water that enters the cell due to the hypotonic environment.
- The contractile vacuole stores this excess water and periodically expels it to prevent the cell from bursting (lysis).
- Additionally, it aids in the excretion of waste products from the cell.

**Conclusion for Statement 2**: This statement is also correct.

### Final Conclusion
Both statements are correct.

### Summary of the Solution
- Statement 1 is correct because the tonoplast in plant cells actively transports ions and maintains osmotic pressure.
- Statement 2 is correct because the contractile vacuole in amoeba is essential for osmoregulation and excretion.