Determine the animal that has blind sac body plan and intracellular as well as extracellular digestion.

Options

A. Meandrina .
B. Taenia
C. Psittacula
D. Limulus

Answer

To solve the question of determining the animal that has a blind sac body plan and exhibits both intracellular and extracellular digestion, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Blind Sac Body Plan**:
- A blind sac body plan refers to an organism that has a digestive cavity with a single opening that serves as both the mouth and the anus. This means that food enters and waste exits through the same aperture.

2. **Identify the Type of Digestion**:
- Intracellular digestion occurs within the cells, while extracellular digestion occurs outside the cells in a digestive cavity. We need to find an organism that exhibits both types of digestion.

3. **Consider the Group of Animals**:
- The group of animals that typically have a blind sac body plan and exhibit both types of digestion are the **Cnidarians** (also known as Silentrata). This group includes organisms like jellyfish, corals, and sea anemones.

4. **Examine Characteristics of Cnidarians**:
- Cnidarians are diploblastic, meaning they have two germ layers. They possess a gastrovascular cavity where digestion occurs. The cells in this cavity can perform intracellular digestion, while extracellular digestion occurs in the cavity itself.

5. **Evaluate the Options Given**:
- The question likely provides options, and we need to evaluate them:
- **Meandrina**: This is a genus of corals, which are Cnidarians. They fit the criteria.
- **Tenia**: This is a tapeworm, which does not have a blind sac body plan.
- **Sitacula**: This refers to a more complex organism that does not fit the criteria.
- **Limulus**: This is a horseshoe crab, which is part of Arthropoda and does not have a blind sac body plan.

6. **Conclusion**:
- Based on the analysis, the animal that has a blind sac body plan and exhibits both intracellular and extracellular digestion is **Meandrina**.

### Final Answer:
**Meandrina** (a genus of corals in the Cnidaria phylum).

---