In which one of the following organism its excretory organs are correctly stated ?

Options

A. Cockroach - Malpighian tubules and enteric caeca
B. Frog - Kidneys, skin & buccal epithelium
C. Humans - Kidneys, sebaceous glands and tear glands
D. Earthworm - Pharyngeal, integumentary & septal nephridia

Answer

To solve the question regarding which organism has its excretory organs correctly stated, we will analyze each option provided (A, B, C, D) based on the information about their excretory systems.

### Step-by-Step Solution:

1. **Analyze Option A (Cockroach)**:
- The cockroach belongs to the phylum Arthropoda.
- Its excretory system consists of Malpighian tubules, which are responsible for the excretion of uric acid.
- The mention of "enteric CK" (which is related to digestion) indicates that this option is incorrect for excretion.
- **Conclusion**: Option A is incorrect.

2. **Analyze Option B (Frog)**:
- Frogs possess kidneys, skin, and buccal epithelium.
- While kidneys are indeed excretory organs, the skin and buccal epithelium are primarily involved in respiration, not excretion.
- Since not all mentioned organs are excretory, this option is also incorrect.
- **Conclusion**: Option B is incorrect.

3. **Analyze Option C (Human)**:
- Humans have kidneys as their main excretory organs, which are responsible for filtering waste from the blood.
- Sebaceous glands (oil glands) and tear glands (lacrimal glands) are not primarily excretory organs; they serve different functions (oil secretion and tear production, respectively).
- Since not all organs listed are excretory, this option is incorrect.
- **Conclusion**: Option C is incorrect.

4. **Analyze Option D (Earthworm)**:
- Earthworms belong to the phylum Annelida and exhibit metameric segmentation.
- Their excretory system consists of nephridia, which are tubular structures that function in excretion.
- Nephridia can be classified into three types: pharyngeal, integumentary, and septal, all of which serve excretory functions.
- Since all mentioned structures are correctly identified as excretory, this option is correct.
- **Conclusion**: Option D is correct.

### Final Answer:
The organism with correctly stated excretory organs is **Earthworm (Option D)**.