Slime pores occur ventrally in

Options

A. Marchantia
B. Riccia
C. Sphagnum
D. Anthoceros.

Answer

To solve the question "Slime pores occur ventrally in", we will analyze each of the given options step by step.

### Step-by-Step Solution:

1. **Understanding Slime Pores**:
- Slime pores are structures found in certain plants, specifically in the sporophyte generation. They are involved in the secretion of mucilage and are typically located on the ventral (lower) side of the plant body.

2. **Analyzing the Options**:
- **Option 1: Marchantia**
- Marchantia is a liverwort and primarily exhibits a gametophyte plant body, which is haploid (1n). Since slime pores are characteristic of the sporophyte, this option is incorrect.

- **Option 2: Riccia**
- Riccia is also a liverwort and like Marchantia, it has a gametophyte dominant life cycle. Therefore, it does not have slime pores in the sporophyte stage. This option is also incorrect.

- **Option 3: Sphagnum**
- Sphagnum, commonly known as peat moss, primarily consists of a gametophyte plant body. The sporophyte is dependent on the gametophyte and does not exhibit slime pores. Thus, this option is incorrect as well.

- **Option 4: Anthoceros**
- Anthoceros is a hornwort and it possesses a sporophyte that is embedded in the gametophyte tissue. The sporophyte of Anthoceros has slime pores located ventrally. Therefore, this is the correct option.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option 4: Anthoceros**.

### Final Answer:
Slime pores occur ventrally in **Anthoceros**.