Haplodiplontic life cycle is observed in

Options

A. Bryophyta
B. Pteridophyta
C. Most of the Algae
D. Both (a) and ( b)

Answer

### Step-by-Step Solution:

1. **Understanding the Haplodiplontic Life Cycle**:
- The haplodiplontic life cycle is characterized by the alternation of generations between two distinct phases: the haploid phase (gametophyte) and the diploid phase (sporophyte).
- In this life cycle, the gametophyte produces haploid gametes through mitosis, while the sporophyte produces diploid spores through meiosis.

2. **Identifying the Organisms**:
- The organisms that exhibit a haplodiplontic life cycle include bryophytes (such as mosses and liverworts) and pteridophytes (such as ferns).
- Both groups show a clear alternation between the haploid gametophyte and the diploid sporophyte.

3. **Excluding Other Groups**:
- While algae can have varied life cycles, they do not consistently exhibit a haplodiplontic life cycle like bryophytes and pteridophytes do.
- Therefore, we can conclude that the haplodiplontic life cycle is not observed in algae.

4. **Final Answer**:
- The correct answer to the question is that the haplodiplontic life cycle is observed in **bryophytes and pteridophytes**.