During alternation of generations in seaweeds, spores give rise to ____________ .

Options

A. gametes
B. gametophytes
C. sporophytes
D. sporozoids

Answer

**Step-by-Step Solution:**

1. **Understanding Alternation of Generations**: In the life cycle of seaweeds, particularly in brown algae (Phaeophyceae), there is a process known as alternation of generations. This involves alternating between two distinct forms: the gametophyte and the sporophyte.

2. **Role of Spores**: Spores are produced during the sporophyte stage of the life cycle. These spores are haploid (1N) and are crucial for the next generation.

3. **Germination of Spores**: When these haploid spores germinate, they develop into gametophytes. This is the next stage in the alternation of generations.

4. **Formation of Gametophytes**: The germination of spores leads to the formation of male and female gametophytes. Male gametophytes produce sperm (antherozoids), while female gametophytes produce eggs.

5. **Fertilization**: The sperm from the male gametophyte fertilizes the egg from the female gametophyte, resulting in the formation of a diploid zygote (2N).

6. **Development of Sporophyte**: The zygote then develops into a sporophyte, which is the diploid generation. This sporophyte will eventually undergo meiosis to produce new haploid spores, thus continuing the cycle.

7. **Conclusion**: Therefore, during the alternation of generations in seaweeds, spores give rise to **gametophytes**.

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