The life cycle of cord moss is

Options

A. Haplontic
B. Haplo-diplontic
C. Diplontic
D. Haplo-haplontic

Answer

To understand the life cycle of cord moss (Bryophyta), we need to explore the different types of life cycles in plants and identify which one applies to cord moss. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Plant Life Cycles
Plant life cycles can be categorized into different types based on the dominance of haploid (n) and diploid (2n) stages. The main types are:
- **Haplontic**: Dominant haploid stage, with a short diploid stage.
- **Diplontic**: Dominant diploid stage, with a short haploid stage.
- **Haplo-diplontic**: Alternation of generations, where both haploid and diploid stages are multicellular.

### Step 2: Identify the Life Cycle of Cord Moss
Cord moss, which belongs to the group of bryophytes, exhibits a life cycle that includes both haploid and diploid stages. In this cycle:
- The **gametophyte** (haploid) is the dominant stage and is multicellular.
- The **sporophyte** (diploid) is dependent on the gametophyte and is typically unicellular or less developed.

### Step 3: Classify the Life Cycle
Since cord moss has a dominant haploid stage (the gametophyte) and a shorter diploid stage (the sporophyte), it is classified as having a **haplo-diplontic** life cycle. This means it alternates between multicellular haploid and diploid forms.

### Conclusion
The life cycle of cord moss is best described as **haplo-diplontic**.

### Final Answer
The life cycle of cord moss is haplo-diplontic.

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