Cryptogams do not have

Options

A. Xylem vessels and sieve tubes
B. Tracheids and sieve tubes
C. Vessels , sieve tubes and companion cells
D. Tracheids and companion cells

Answer

To solve the question "Cryptogams do not have," we will analyze the options provided and determine which structures are absent in cryptogams.

### Step-by-Step Solution:

1. **Understanding Cryptogams**:
- Cryptogams are a group of plants that reproduce via spores instead of seeds. They include algae, fungi, mosses, and ferns.
- They are non-flowering plants and lack certain vascular structures that are present in higher plants.

2. **Analyzing the Options**:
- **Option 1: Vessels and Sieve Tubes**:
- Vessels are specialized structures for water transport found in higher plants (angiosperms). Cryptogams typically do not have vessels.
- Sieve tubes are involved in the transport of nutrients, especially sugars, in flowering plants. Cryptogams do not possess sieve tubes either.
- This option is likely correct as cryptogams do not have these structures.

- **Option 2: Tracheids and Sieve Tubes**:
- Tracheids are present in cryptogams and are involved in water conduction. Since tracheids are present, this option is incorrect.
- Sieve tubes are also absent in cryptogams, but since tracheids are present, this option cannot be correct.

- **Option 3: Vessel Tubes and Companion Cells**:
- As mentioned earlier, vessels are absent in cryptogams. Companion cells, which assist in the functioning of sieve tubes, are also absent.
- Therefore, this option is correct since cryptogams do not have vessel tubes or companion cells.

- **Option 4: Heterocysts and Companion Cells**:
- Heterocysts are specialized cells found in some cyanobacteria that fix nitrogen. While companion cells are absent in cryptogams, heterocysts can be present in certain cryptogams (e.g., some cyanobacteria).
- Hence, this option cannot be correct as it does not fully represent the absence of structures in cryptogams.

3. **Conclusion**:
- The correct answer is **Option 3: Vessel Tubes and Companion Cells**. Cryptogams do not have these structures.

### Final Answer:
Cryptogams do not have **Vessel Tubes and Companion Cells**.