Life cycle is haplontic in

Options

A. Funaria
B. Ulothrix
C. Selaginella
D. Pinus.

Answer

### Step-by-Step Solution:

1. **Understanding Life Cycles in Plants**:
- In plants, there are different types of life cycles characterized by the alternation of generations, specifically the haploid (gametophyte) and diploid (sporophyte) phases.

2. **Defining Haplointic Life Cycle**:
- A haplontic life cycle is one where the dominant phase is haploid. In this cycle, the sporophyte is typically a unicellular zygote, and there are no free-living sporophytes.

3. **Examples of Organisms with Haplointic Life Cycle**:
- This type of life cycle is primarily observed in certain algae, such as:
- **Chlamydomonas**
- **Spirogyra**
- **Ulothrix**

4. **Meiosis in Haplointic Life Cycle**:
- In the haplontic life cycle, meiosis occurs in the zygote, resulting in the formation of haploid spores. These spores then germinate to form the gametophyte.

5. **Identifying the Correct Answer**:
- The question asks which organism exhibits a haplontic life cycle. Among the options provided:
- **Ulothrix** is the correct answer as it is known to have a haplontic life cycle.
- The other options, such as **Phanaria** (a moss), **Selaginella**, and **Pinus** (both ferns), exhibit different types of life cycles (haplodiplontic).

### Final Answer:
- The life cycle is haplontic in **Ulothrix**.

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