In Bryophytes what is absent :-

Options

A. Embryo formation
B. Fertilization
C. Motile gametes
D. True roots and vascular tissue

Answer

### Step-by-Step Solution:

1. **Understanding Bryophytes**: Bryophytes are a group of non-vascular plants that include mosses, liverworts, and hornworts. They are characterized by their simple structure and lack of true roots, stems, and leaves.

2. **Identifying Structures in Bryophytes**:
- **True Roots**: Bryophytes do not have true roots. Instead, they have root-like structures called rhizoids that anchor them to the substrate but do not absorb nutrients like true roots do.
- **Vascular Tissue**: Bryophytes lack vascular tissues (xylem and phloem), which are responsible for the transport of water, nutrients, and food in higher plants. Instead, they absorb water and nutrients directly from their surroundings.
- **Mechanical Tissue**: Bryophytes also lack mechanical tissues that provide structural support, which is common in higher plants.

3. **Conclusion**: Based on the characteristics of bryophytes, we can conclude that the following are absent in bryophytes:
- True roots
- Vascular tissue
- Mechanical tissue

4. **Final Answer**: In bryophytes, true roots and vascular tissue are absent.