Common feature in earthworm and cockroach is

Options

A. cuticle (exoskeleton)
B. solid and ventral nerve cord
C. nephridia
D. malpighian tubules

Answer

To determine the common feature between earthworms and cockroaches, we will analyze the options provided:

1. **Cuticle/Exoskeleton**:
- Cockroaches have a chitinous exoskeleton, which provides protection and support.
- Earthworms do not possess an exoskeleton; instead, they have a moist cuticle that aids in respiration and movement.
- Therefore, this option is not common to both.

2. **Solid and Ventral Nerve Cord**:
- Both earthworms and cockroaches belong to the group of non-chordates.
- In non-chordates, the nerve cord is solid and located ventrally (on the belly side).
- This is a characteristic feature of both organisms, making this option a common feature.

3. **Nephridia**:
- Nephridia are the excretory organs found in earthworms, responsible for the removal of waste.
- Cockroaches do not have nephridia; instead, they possess Malpighian tubules for excretion.
- Thus, this option is not common to both.

4. **Malpighian Tubule**:
- Malpighian tubules are the excretory structures found in cockroaches, helping in the elimination of uric acid.
- Earthworms do not have Malpighian tubules; they rely on nephridia for excretion.
- Therefore, this option is also not common to both.

After analyzing all the options, the common feature between earthworms and cockroaches is:

**Answer**: Solid and ventral nerve cord.