Read the following statements and select the correct option.
Statement (i)Pure water has the highest water potential,`i.e.` zero.
Statement (ii)Process of diffusion does not require any input of energy.
Statement (iii)Water moves from the system containing water at higher water potential to the one having lower water potential.

Options

A. Statements `(i)`and `(ii)` are correct.
B. Statements`(ii)` and `(iii)` are correct.
C. Statements `(i)` and `(iii)` are correct.
D. Statements `(i),(ii)` and `(iii)` are correct.

Answer

To solve the question, we need to analyze each of the three statements provided and determine their validity.

### Step-by-Step Solution:

1. **Evaluate Statement (i):**
- **Statement:** Pure water has the highest water potential, i.e., zero.
- **Explanation:** Water potential is a measure of the potential energy of water in a system. Pure water, which has no solutes, has a water potential of zero. When solutes are added, the water potential becomes negative because the presence of solutes reduces the free energy of water. Thus, this statement is **correct**.

2. **Evaluate Statement (ii):**
- **Statement:** The process of diffusion does not require any input of energy.
- **Explanation:** Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. This process occurs naturally due to the kinetic energy of the molecules and does not require any external energy input (like ATP). Therefore, this statement is also **correct**.

3. **Evaluate Statement (iii):**
- **Statement:** Water moves from the system containing water at higher water potential to the one having lower water potential.
- **Explanation:** Water moves from areas of high water potential (where there is more free water and fewer solutes) to areas of low water potential (where there are more solutes and less free water). This movement is driven by the concentration gradient, aiming to achieve equilibrium. Hence, this statement is **correct** as well.

### Conclusion:
Since all three statements are correct, the correct option is:
- **Option D: 1, 2, and 3 are correct.**