In platyhelminthes, digestive system is incomplete because

Options

A. it absorbs food from general body surface
B. it has suckers and hooks in parasitic from
C. it has only one opening that serves as mouth and anus
D. All of the above

Answer

To solve the question regarding why the digestive system in Platyhelminthes is considered incomplete, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Digestive Systems**:
- A complete digestive system has two separate openings: one for ingestion (mouth) and one for egestion (anus). An incomplete digestive system has only one opening that serves both functions.

2. **Identifying Characteristics of Platyhelminthes**:
- Platyhelminthes, commonly known as flatworms, possess a single opening that functions as both mouth and anus. This is a key characteristic of their digestive system.

3. **Evaluating the Options**:
- **Option A**: "It absorbs food from general body surface" - This is incorrect as Platyhelminthes primarily take in food through their mouth.
- **Option B**: "It has suckers and hooks in parasitic form" - While many Platyhelminthes are parasitic and have adaptations like hooks and suckers, this does not explain why their digestive system is incomplete.
- **Option C**: "It has only one opening that serves as mouth and anus" - This is correct and directly explains the incompleteness of their digestive system.
- **Option D**: "All of the above" - Since Options A and B are incorrect, this option cannot be correct.

4. **Conclusion**:
- The correct answer is that the digestive system of Platyhelminthes is incomplete because it has only one opening that serves as both mouth and anus.

### Final Answer:
The digestive system in Platyhelminthes is incomplete because it has only one opening that serves as both mouth and anus.

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