Select the incorrect statements from the following:

A. Digestive system in Platyhelminthes is incomplete.

B. Bilateral symmetry is a characteristic feature of adult Echinoderms.

C. Pseudocoelom is possessed by Aschelminthes.

D. Notochord is persistent throughout life in the class Chondrichthyes.

E. Members of class Reptilia maintain a constant body temperature.

Choose the answer from the options given below:

Question

Select the incorrect statements from the following:

A. Digestive system in Platyhelminthes is incomplete.

B. Bilateral symmetry is a characteristic feature of adult Echinoderms.

C. Pseudocoelom is possessed by Aschelminthes.

D. Notochord is persistent throughout life in the class Chondrichthyes.

E. Members of class Reptilia maintain a constant body temperature.

Choose the answer from the options given below:

Accepted Answer

B. 1. **Checking statement A:**
Platyhelminthes (flatworms) have a digestive system with only one opening (mouth), so undigested waste and food intake share the same opening.
This makes the digestive system **incomplete**, so statement A is **correct**.

2. **Checking statement B:**
Radial symmetry, not bilateral symmetry, is the feature seen in **adult** echinoderms; bilateral symmetry is instead seen in their larval stage.
So, statement B is **incorrect**.

3. **Checking statement C:**
Members of Aschelminthes (roundworms) possess a body cavity called a **pseudocoelom**, which is not fully lined by mesoderm.
So, statement C is **correct**.

4. **Checking statement D:**
In class Chondrichthyes (cartilaginous fishes like sharks), the notochord does **persist throughout life**, since it is never fully replaced by a vertebral column.
So, statement D is **correct**.

5. **Checking statement E:**
Reptiles are **cold-blooded (poikilothermic)** animals, meaning their body temperature changes with the surroundings rather than staying constant.
So, statement E is **incorrect**.

6. **Conclusion:**
The incorrect statements are B and E.
Hence, the answer is **option B**.