Read following are two statements and choose the correct option .
(a) : A complete gut is present in the members of Ascheminthes
(b) : Tube -within -tube body plan is seen in the members of Aschelminthes

Options

A. Both (a)and (b) are false
B. Both (a) and (b) are true
C. Only (a) is true , (b) is false
D. Only (b) is true ,(a) is false

Answer

To solve the question, we need to evaluate the two statements regarding the members of Aschelminthes (also known as Nematodes or roundworms):

### Step-by-Step Solution:

1. **Understanding Statement A**:
- Statement A claims that "A complete gut is present in the members of Aschelminthes."
- A complete gut means that the organism has two openings: a mouth for ingestion and an anus for excretion.
- In the case of Aschelminthes (Nematodes), they do indeed have a mouth and an anus, which means they possess a complete digestive system.

2. **Understanding Statement B**:
- Statement B states that "Tube-within-tube body plan is seen in the members of Aschelminthes."
- The tube-within-tube body plan refers to a body structure where there is an outer tube (the body wall) and an inner tube (the digestive tract).
- Nematodes exhibit this body plan as they have a body cavity (pseudocoelom) that separates the gut from the body wall, confirming that they also fit this description.

3. **Evaluating Both Statements**:
- Since both statements A and B are true based on our understanding of Aschelminthes, we can conclude that the correct option is that both statements are true.

### Final Answer:
Both statements A and B are true.

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