Correct order of excretory organs in Cockroach, Earthworm and Rabbit respectively

Options

A. Skin, malpighi tubules, kidney
B. Malpighi tubules, nephridia, kidney
C. Nephridia, malpighi tubules, kidney
D. Nephridia, kidney, green gland

Answer

To determine the correct order of excretory organs in Cockroach, Earthworm, and Rabbit, we will analyze the excretory systems of each organism step by step.

### Step 1: Identify the excretory organ in Cockroach
- The primary excretory organ in a Cockroach is the **Malpighian tubules**. These tubules are located at the junction of the midgut and hindgut, and they play a crucial role in the excretion of waste products.

**Hint:** Remember that Malpighian tubules are specific to insects like cockroaches.

### Step 2: Identify the excretory organ in Earthworm
- In Earthworms, the excretory organs are called **nephridia**. Each segment of the earthworm contains a pair of nephridia, which function to filter waste from the body cavity and excrete it.

**Hint:** Earthworms have segmented bodies, and each segment has its own pair of nephridia.

### Step 3: Identify the excretory organ in Rabbit
- In Rabbits, which are mammals, the primary excretory organs are the **kidneys**. Rabbits have a pair of kidneys that filter blood and produce urine.

**Hint:** Mammals typically have kidneys as their main excretory organs.

### Step 4: Compile the findings
- Now, we can compile the findings:
- Cockroach: Malpighian tubules
- Earthworm: Nephridia
- Rabbit: Kidneys

### Conclusion
The correct order of excretory organs in Cockroach, Earthworm, and Rabbit respectively is:
**Malpighian tubules, Nephridia, Kidneys.**

### Final Answer
**Option B: Malpighian tubules, Nephridia, Kidneys.**

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