How many organisms show diplotic life cycle ?
Selaginella, Equisetum , Cycas , Cedrus , Ectocarpus , Fucus , sequoia

Options

A. 7
B. 5
C. 4
D. 6

Answer

To determine how many organisms from the given list show a diplontic life cycle, we need to analyze each organism based on their classification and life cycle type.

### Step-by-Step Solution:

1. **Understand Diplontic Life Cycle**:
- The diplontic life cycle is characterized by a multicellular diploid stage (sporophyte) that is dominant. In this cycle, the organism primarily exists in the diploid state, and the haploid stage is reduced and often short-lived.

2. **List the Organisms**:
- The organisms provided are:
- Selaginella
- Equisetum
- Cycas
- Cedrus
- Ectocarpus
- Fucus
- Sequoia

3. **Identify the Life Cycle of Each Organism**:
- **Selaginella**: This is a pteridophyte and exhibits a haplodiplontic life cycle.
- **Equisetum**: Also a pteridophyte, it shows a haplodiplontic life cycle.
- **Cycas**: This is a gymnosperm and exhibits a diplontic life cycle.
- **Cedrus**: Another gymnosperm, it also exhibits a diplontic life cycle.
- **Ectocarpus**: This is an algae and shows a haplodiplontic life cycle.
- **Fucus**: This is also an algae but exhibits a diplontic life cycle.
- **Sequoia**: A gymnosperm, it exhibits a diplontic life cycle.

4. **Count the Organisms with Diplontic Life Cycle**:
- From the analysis:
- Cycas (diplontic)
- Cedrus (diplontic)
- Fucus (diplontic)
- Sequoia (diplontic)
- Total organisms showing diplontic life cycle = 4 (Cycas, Cedrus, Fucus, Sequoia).

### Final Answer:
**4 organisms show a diplontic life cycle.**