Which of the following cannot be considered as characteristic feature of arthropods?

Options

A. Jointed appendages
B. Direct development
C. Schizocoelom
D. Bilateral symmetry

Answer

To determine which feature cannot be considered a characteristic of arthropods, we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Characteristics of Arthropods**:
- Arthropods are known for specific features such as jointed appendages, a segmented body, a hard exoskeleton made of chitin, and bilateral symmetry.

2. **Examine the First Option: Jointed Appendages**:
- Jointed appendages are a defining characteristic of arthropods. They have legs and other appendages that are segmented and jointed, allowing for flexibility and movement.
- **Conclusion**: This feature is characteristic of arthropods.

3. **Examine the Second Option: Direct Development**:
- Direct development refers to a life cycle where the organism develops directly from an egg to an adult without undergoing any larval stages.
- In arthropods, particularly insects, the development involves metamorphosis, which includes larval and pupal stages before reaching adulthood.
- **Conclusion**: Direct development is not a characteristic of arthropods.

4. **Examine the Third Option: Coelom**:
- Arthropods possess a hemocoel, which is a type of body cavity filled with blood (hemolymph), but they do not have a true coelom like some other animal groups. However, the term "coelom" can sometimes refer to the body cavity in a broader sense.
- **Conclusion**: While arthropods have a body cavity, it is not a true coelom in the traditional sense, but it is still a feature associated with them.

5. **Examine the Fourth Option: Bilateral Symmetry**:
- Bilateral symmetry is a characteristic of arthropods, meaning their body can be divided into two equal halves along a single plane.
- **Conclusion**: This feature is characteristic of arthropods.

### Final Answer:
The characteristic that cannot be considered a feature of arthropods is **Direct Development**.

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