Given below are three statements regarding Aschelminthes.
(i) They are bilaterally symmetrical and triploblastic.
(ii) They are dioecious.
(iii) All are plant or animal parasites.
Select the option that has both the correct statemets.

Options

A. (i) and (iii)
B. (i) and (iii)
C. (ii) and (iii)
D. None of these

Explanation

To solve the question regarding the statements about Aschelminthes, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Statement (i)**:
- The statement claims that Aschelminthes are bilaterally symmetrical and triploblastic.
- **Explanation**: Aschelminthes, also known as roundworms, are indeed bilaterally symmetrical, meaning they can be divided into two equal halves. They are also triploblastic, which means they develop from three germ layers: ectoderm, mesoderm, and endoderm.
- **Conclusion**: This statement is **correct**.

2. **Analyze Statement (ii)**:
- The statement claims that Aschelminthes are dioecious.
- **Explanation**: Dioecious means that the species have distinct male and female individuals. Aschelminthes do exhibit this characteristic, as they have separate male and female organisms.
- **Conclusion**: This statement is **correct**.

3. **Analyze Statement (iii)**:
- The statement claims that all Aschelminthes are plant or animal parasites.
- **Explanation**: While many Aschelminthes are indeed parasites of plants and animals, it is not accurate to say that all of them are. Some may be free-living or exist in non-parasitic forms.
- **Conclusion**: This statement is **incorrect**.

### Final Conclusion:
Based on the analysis:
- Statement (i) is correct.
- Statement (ii) is correct.
- Statement (iii) is incorrect.

Therefore, the option that includes both correct statements is **first and second**.