Dominant phase of bryophytes bear

Options

A. Multicellular sex organs
B. Unicellular sex organs
C. Spore mother cells
D. Capsules

Answer

### Step-by-Step Solution:

1. **Understanding the Life Cycle of Bryophytes**:
- Bryophytes, which include mosses, liverworts, and hornworts, have a unique life cycle that alternates between two phases: the gametophytic phase and the sporophytic phase.

2. **Identifying the Dominant Phase**:
- In bryophytes, the dominant phase is the gametophytic phase. This phase is characterized by the presence of gametes, which are produced by the gametophyte.

3. **Characteristics of the Gametophytic Phase**:
- The gametophytic phase is haploid (n), meaning it has one set of chromosomes. In this phase, both male and female gametes are produced.
- The gametophyte is not unicellular; instead, it is multicellular and functions as a sex organ, producing numerous gametes.

4. **Comparing with Sporophytic Phase**:
- The sporophytic phase, which is diploid (2n), arises from the fertilization of gametes and is not the dominant phase in bryophytes. It is typically dependent on the gametophyte for nutrition.

5. **Conclusion**:
- Based on the characteristics and dominance of the phases, the correct answer to the question "Dominant phase of bryophytes bear" is that the dominant phase is the **multicellular sex organ**, which corresponds to the gametophytic phase.

### Final Answer:
The dominant phase of bryophytes bears multicellular sex organs (gametophytic phase).

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