Name two factors that affect water potential.

Explanation

**Step-by-Step Solution:**

1. **Understanding Water Potential**: Water potential is a measure of the potential energy of water in a system and is influenced by various factors. It is denoted by the symbol Ψ (psi) and is measured in units of pressure (usually megapascals, MPa).

2. **Identifying the Factors**: There are two main factors that affect water potential:
- **Solute Potential (Ψs)**: This factor is influenced by the presence of solutes in the water. When solutes are added to pure water, they bind with water molecules, reducing the number of free water molecules and thus decreasing the water potential. The solute potential is usually negative because the addition of solutes lowers the water potential compared to pure water.
- **Pressure Potential (Ψp)**: This factor refers to the physical pressure exerted on the water within a plant cell or system. Pressure potential can be positive or negative, but it is typically positive in living plant cells due to turgor pressure. This pressure can increase the water potential.

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