Algae such as (i)_______ have a haplo-diplontic life cycle, while Fucus has a (ii)_______ life cycle.

Options

A. i-Ectocarpur, ii-haplontic
B. i-Spirogyra, ii-diplontic
C. i-Ectocarpus, ii-diplontic
D. i-Spirogyra, ii-haplontic

Answer

To answer the question, we need to fill in the blanks regarding the life cycles of certain algae.

1. **Identify algae with a haplo-diplontic life cycle:**
- The haplo-diplontic life cycle is characterized by the presence of both haploid (gametophytic) and diploid (sporophytic) stages that are both significant in the life cycle.
- An example of algae that exhibits a haplo-diplontic life cycle is **Ectocarpus**.

2. **Identify the life cycle of Fucus:**
- Fucus is a type of brown algae that primarily exists in the diploid state for most of its life cycle, indicating it has a predominantly diploid (sporophytic) life cycle.
- Therefore, Fucus has a **diplontic** life cycle.

Combining these findings, we can fill in the blanks:

(i) Ectocarpus
(ii) Diplontic

### Final Answer:
Algae such as **Ectocarpus** have a haplo-diplontic life cycle, while Fucus has a **diplontic** life cycle.