Which of the following statements are incorrec?
(i) Parapodia are lateral appendages in arthropods used for swimming.
(ii) Radula in molluscs are structures involved in excretion.
(iii) Aschelminthes are dioecious.
(iv) Echinoderm adults show radial symmetry.
(v) Ctenophorans are diploblastic

Options

A. (i) and (ii)
B. (i) and (iii)
C. (i),(iv) and (v)
D. (iii) and (v)

Explanation

To determine which statements are incorrect, we will analyze each statement one by one.

1. **Statement (i)**: "Parapodia are lateral appendages in arthropods used for swimming."
- **Analysis**: Parapodia are actually found in annelids (such as earthworms) and are used for locomotion, not in arthropods. Therefore, this statement is incorrect.

2. **Statement (ii)**: "Radula in molluscs are structures involved in excretion."
- **Analysis**: The radula is a specialized feeding organ in molluscs, used for scraping food. It is not involved in excretion. Thus, this statement is also incorrect.

3. **Statement (iii)**: "Aschelminthes are dioecious."
- **Analysis**: Aschelminthes (now often referred to as a group of pseudocoelomates) are indeed dioecious, meaning they have distinct male and female individuals. This statement is correct.

4. **Statement (iv)**: "Echinoderm adults show radial symmetry."
- **Analysis**: Echinoderms, such as starfish, exhibit radial symmetry as adults. This statement is correct.

5. **Statement (v)**: "Ctenophorans are diploblastic."
- **Analysis**: Ctenophorans (comb jellies) are actually triploblastic, meaning they have three germ layers. This statement is incorrect.

**Conclusion**: The incorrect statements are (i), (ii), and (v).

### Summary of Incorrect Statements:
- (i) Parapodia are lateral appendages in arthropods used for swimming. (Incorrect)
- (ii) Radula in molluscs are structures involved in excretion. (Incorrect)
- (v) Ctenophorans are diploblastic. (Incorrect)