The plant body of bryophytes is thallus-like and prostate or erect, and attached to substratum by

Options

A. Unicellular roots
B. Multicellular roots
C. Unicellular or multicellular rhizoids
D. Adhesive

Answer

### Step-by-Step Text Solution:

1. **Understanding Bryophytes**: Bryophytes are a group of non-vascular plants that include mosses, liverworts, and hornworts. They are often referred to as the "amphibians of the plant kingdom" because they require water for their reproductive processes.

2. **Plant Body Structure**: The plant body of bryophytes is characterized as thallus-like, meaning it does not have true roots, stems, or leaves like higher plants. Instead, it has a simple structure that can be either prostate (lying flat) or erect (standing upright).

3. **Attachment to Substratum**: Bryophytes attach themselves to the substratum (the surface they grow on) using structures known as rhizoids. These rhizoids can be either unicellular (made up of a single cell) or multicellular (made up of multiple cells).

4. **Types of Rhizoids**:
- **Unicellular Rhizoids**: These are simple, single-celled structures that anchor the bryophyte to the substrate.
- **Multicellular Rhizoids**: These are more complex, consisting of multiple cells, providing better anchorage and sometimes aiding in water absorption.

5. **Conclusion**: In summary, the plant body of bryophytes is thallus-like and is attached to the substratum by unicellular or multicellular rhizoids.

### Final Answer:
The plant body of bryophytes is thallus-like and is attached to the substratum by unicellular or multicellular rhizoids.

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