Angiosperms : Roots : Rhodophyta : : ………….

Answer

To solve the analogy "Angiosperms : Roots : Rhodophyta : ………….", we need to understand the relationship between the first two terms and then apply that same relationship to the second pair.

1. **Identify the relationship in the first pair (Angiosperms : Roots)**:
- Angiosperms are flowering plants, and their roots serve a crucial function. Roots anchor the plant in the soil and are responsible for the absorption of water and nutrients.

2. **Identify the corresponding structure in Rhodophyta**:
- Rhodophyta, commonly known as red algae, do not have true roots like angiosperms. Instead, they have a structure called a "holdfast."

3. **Define the function of the holdfast**:
- The holdfast serves a similar purpose to roots in that it anchors the red algae to the substrate (the surface it grows on) in aquatic environments. While it does not absorb nutrients in the same way that roots do, it helps the algae stay attached and can assist in nutrient uptake from the surrounding water.

4. **Complete the analogy**:
- Therefore, just as roots are to angiosperms, holdfasts are to Rhodophyta.

Thus, the complete analogy is: Angiosperms : Roots : Rhodophyta : Holdfast.

**Final Answer**: Holdfast

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