Life cycle of Ectocarpus and Fucus respectivley are

Options

A. Haplontic , Diplontic
B. Diplontic,Haplodiplontic
C. Haplodiplontic,Diplontic
D. Haplodiplontic, Haplontic

Answer

To answer the question regarding the life cycles of Ectocarpus and Fucus, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Identify the Organisms**:
- Ectocarpus and Fucus are both types of algae. Recognizing them as members of the plant kingdom helps in understanding their life cycles.

2. **Understand Life Cycle Types**:
- Life cycles in plants can be categorized into different types: haplontic, diplontic, and haplodiplontic.
- Haplontic: Dominated by the haploid (n) phase.
- Diplontic: Dominated by the diploid (2n) phase.
- Haplodiplontic: Alternation of generations between haploid and diploid phases.

3. **Determine the Life Cycle of Ectocarpus**:
- Ectocarpus exhibits a haplodiplontic life cycle. This means it has both a multicellular haploid phase (gametophyte) and a multicellular diploid phase (sporophyte).

4. **Determine the Life Cycle of Fucus**:
- Fucus, on the other hand, has a diplontic life cycle. This means that the dominant phase is the diploid sporophyte, and the haploid phase is relatively short-lived.

5. **Conclude the Answer**:
- Therefore, the life cycles of Ectocarpus and Fucus respectively are haplodiplontic and diplontic.

### Final Answer:
The life cycle of Ectocarpus is haplodiplontic, and the life cycle of Fucus is diplontic.

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