Which one of the following has haplontic life cycle

Options

A. (a) Ustilago
B. (b) Wheat
C. (c) Funaria
D. (d) Polytrichum

Answer

To determine which organism has a haplontic life cycle, we can follow these steps:

### Step 1: Understand the Types of Life Cycles
- **Diplontic Life Cycle**: This cycle begins with the formation of a zygote after fertilization. The zygote undergoes mitosis to develop into a diploid multicellular organism. This organism has specialized sex organs that undergo meiosis to produce gametes, which then fertilize to form a new zygote.

- **Haplodiplontic Life Cycle**: In this cycle, the zygote formed after fertilization undergoes mitosis to create a diploid multicellular organism. This organism also has sex organs that undergo meiosis to produce spores. These spores then undergo mitosis to form a haploid multicellular organism. This cycle has both haploid and diploid stages.

- **Haplontic Life Cycle**: In this cycle, after fertilization, the zygote undergoes direct meiosis to produce spores. These spores can be single-celled or multicellular but remain haploid throughout their life cycle, with no diploid multicellular stage.

### Step 2: Analyze the Options
- The options provided likely include various organisms. We need to identify which of these organisms exhibits a haplontic life cycle.

### Step 3: Identify the Correct Organism
- According to the information provided in the transcript, **Eustilago**, which is a type of fungus, is mentioned as having a haplontic life cycle.

### Conclusion
- Therefore, the organism that has a haplontic life cycle from the given options is **Eustilago**.

### Final Answer
- The correct answer is **Eustilago**.