Structure common between earthworm and cockroach is
Or Which one feature is common to leech cockroach and scorpion

Options

A. Nephridia
B. Cephalization
C. Ventral nerve chord
D. Antennae

Answer

To solve the question regarding the common structure between earthworm and cockroach, we can follow these steps:

### Step 1: Analyze the Options
The options given are:
a. Nephridia
b. Cephalization
c. Ventral nerve cord
d. Antenna

### Step 2: Understand Each Option
- **Nephridia**: This is an excretory structure found in earthworms, used for osmoregulation and excretion. Cockroaches do not have nephridia; instead, they have Malpighian tubules for excretion.

- **Cephalization**: This refers to the concentration of sensory organs and nervous tissue at the anterior end of the organism. While cockroaches exhibit cephalization, earthworms do not show this feature prominently.

- **Ventral nerve cord**: Both earthworms and cockroaches possess a ventral nerve cord. This structure is part of their nervous system, consisting of paired ganglia connected by lateral nerves.

- **Antenna**: Antennae are sensory structures found in cockroaches (which are insects) but are absent in earthworms.

### Step 3: Identify the Common Structure
From the analysis:
- Nephridia is specific to earthworms.
- Cephalization is more pronounced in cockroaches.
- Ventral nerve cord is present in both.
- Antenna is only in cockroaches.

Thus, the common structure between earthworm and cockroach is the **ventral nerve cord**.

### Step 4: Final Answer
The correct answer is **c. Ventral nerve cord**.

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