Select the incorrect statement.

Options

A. Photosynthesis takes place in the leaf of a plant.
B. Relation between fungi and roots of higher plants is parasitic in nature.
C. Rhizobium often lives in the roots of pea and bean plants.
D. Cuscuta is a total parasitic plant that has no leaves and roots.

Explanation

To solve the question of selecting the incorrect statement, we will analyze each of the four statements provided:

1. **Statement 1**: "Photosynthesis takes place in the leaf of a plant."
- This statement is **correct**. Photosynthesis primarily occurs in the leaves of plants where chlorophyll is present.

2. **Statement 2**: "There is a relationship between fungi and roots of higher plants which is parasitic in nature."
- This statement is **incorrect**. The relationship between fungi (specifically mycorrhizal fungi) and the roots of higher plants is typically **symbiotic**, not parasitic. In this relationship, both the fungi and the plants benefit.

3. **Statement 3**: "Rhizobium often lives in the roots of P and B plants."
- This statement is **correct**. Rhizobium is a type of bacteria that forms a symbiotic relationship with leguminous plants (often referred to as P and B plants), helping them fix nitrogen.

4. **Statement 4**: "Cascuit is a total parasitic plant that has no leaves and roots."
- This statement is **correct**. Cascuit (or Cuscuta) is indeed a parasitic plant that lacks chlorophyll, leaves, and roots, relying on host plants for nutrients.

Based on the analysis, the incorrect statement is **Statement 2**.

### Final Answer:
The incorrect statement is: **"There is a relationship between fungi and roots of higher plants which is parasitic in nature."**