Read the following statements about phylum Annelida. Identify the true and false statements and select the correct option after referring to the given table .
A. Annelids are diploblastic , metamerically segmented , coelomate animals.
B. Their neural system consists of paired ganglia connected by lateral nerves to a single ventral nerve cord .
C. They process longitudinal and circular muscle fibres which help in locomotion .
D Nephridia help them in osmoregulation and excretion.

Options

A. A: False , B: True , C: False , D: True
B. A: False , B: False , C: True , D: True
C. A: True , B: False , C: True , D: False
D. A: False , B: True , C: False , D: True

Answer

To solve the question regarding the phylum Annelida, we need to evaluate each statement provided and determine whether it is true or false. Let's analyze each statement step by step.

### Step 1: Analyze Statement A
**Statement A:** Annelids are diploblastic, metamerically segmented, coelomate animals.

- **Analysis:** Annelids are actually triploblastic, meaning they have three germ layers (ectoderm, mesoderm, and endoderm). They are indeed metamerically segmented and coelomate (having a true coelom). However, the classification as diploblastic is incorrect.
- **Conclusion:** This statement is **False**.

### Step 2: Analyze Statement B
**Statement B:** Their neural system consists of paired ganglia connected by lateral nerves to a single ventral nerve cord.

- **Analysis:** Annelids have a nervous system that includes paired ganglia, but they possess a double ventral nerve cord, not a single one. The connection to a single ventral nerve cord makes this statement incorrect.
- **Conclusion:** This statement is **False**.

### Step 3: Analyze Statement C
**Statement C:** They possess longitudinal and circular muscle fibers which help in locomotion.

- **Analysis:** This statement is accurate. Annelids have both longitudinal and circular muscle fibers that facilitate movement through contraction and relaxation, allowing them to burrow and move effectively.
- **Conclusion:** This statement is **True**.

### Step 4: Analyze Statement D
**Statement D:** Nephridia help them in osmoregulation and excretion.

- **Analysis:** Nephridia are indeed excretory structures in annelids that play a crucial role in osmoregulation and the removal of waste products from the body.
- **Conclusion:** This statement is **True**.

### Final Conclusion
Based on the analysis:
- Statement A: False
- Statement B: False
- Statement C: True
- Statement D: True

The correct option based on the true and false evaluations is **False, False, True, True**.