Which is wrong for an insect

Options

A. Cephalization and unjointed appendages
B. Chitinous exoskeleton and wings
C. Ceohalisation and complete metamorphosis
D. Well developed sensory organs and haemocoel.

Answer

To determine which statement is incorrect regarding insects, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Options**:
We have four options to evaluate:
- Option 1: Cephalization and unjointed appendages
- Option 2: Chitinous exoskeleton and wings
- Option 3: Cephalization and complete metamorphosis
- Option 4: Well-developed sensory organs and hemocytes

2. **Analyzing Option 1**:
- **Cephalization**: This is the concentration of sensory organs and nerve tissues at the front end of the organism, forming a head. Insects exhibit cephalization, so this part is correct.
- **Unjointed Appendages**: Insects have jointed appendages, not unjointed. Therefore, this part of the statement is incorrect.

3. **Analyzing Option 2**:
- **Chitinous Exoskeleton**: Insects possess an exoskeleton made of chitin, which is correct.
- **Wings**: Many insects have wings, making this part of the statement correct as well. Thus, this option is correct.

4. **Analyzing Option 3**:
- **Cephalization**: As previously mentioned, insects are cephalized, so this is correct.
- **Complete Metamorphosis**: Many insects undergo complete metamorphosis, which includes stages such as egg, larva, pupa, and adult. This is also correct. Therefore, this option is correct.

5. **Analyzing Option 4**:
- **Well-developed Sensory Organs**: Insects have advanced sensory organs, which is correct.
- **Hemocytes**: Insects have hemolymph (analogous to blood) that circulates in their body, and they do have cells called hemocytes involved in immune responses. Thus, this option is also correct.

6. **Conclusion**:
After analyzing all the options, we find that Option 1 is the only incorrect statement regarding insects. Insects do exhibit cephalization, but they do not have unjointed appendages; instead, they have jointed appendages.

### Final Answer:
The incorrect option is **Option 1: Cephalization and unjointed appendages**.

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