Match the organisms with their excretory organs:
`{:(,"Organism",,"Excretory organ"),(a.,"Earthworm",p.,"Protonephridia"),(b.,"Cockroach",q.,"Green glands"),(c.,"Rotifers",r.,"Nephridia"),(d.,"Prawn",s.,"Malpighian tubule"):}`

Options

A. a-q,b-p,c-r,d-s
B. a-r,b-q,c-s,d-p
C. a-r,b-s,c-p,d-q
D. a-r,b-s,c-q,d-p

Answer

To solve the question of matching organisms with their respective excretory organs, we will analyze each organism and identify the correct excretory organ associated with it.

### Step-by-Step Solution:

1. **Identify the Excretory Organ of Earthworm:**
- Earthworms are segmented invertebrates and possess a complex system of excretory organs known as **nephridia**.
- **Match:** Earthworm → Nephridia (R)

2. **Identify the Excretory Organ of Cockroach:**
- Cockroaches utilize **Malpighian tubules** for excretion, which help in the removal of waste from their hemolymph.
- **Match:** Cockroach → Malpighian tubule (S)

3. **Identify the Excretory Organ of Rotifers:**
- Rotifers have excretory organs called **protonephridia**, which are involved in osmoregulation and excretion.
- **Match:** Rotifers → Protonephridia (P)

4. **Identify the Excretory Organ of Prawn:**
- Prawns have specialized excretory organs known as **green glands**.
- **Match:** Prawn → Green glands (Q)

### Final Matching:
- Earthworm → Nephridia (R)
- Cockroach → Malpighian tubule (S)
- Rotifers → Protonephridia (P)
- Prawn → Green glands (Q)

### Conclusion:
The correct matches are:
- (a) Earthworm → (r) Nephridia
- (b) Cockroach → (s) Malpighian tubule
- (c) Rotifers → (p) Protonephridia
- (d) Prawn → (q) Green glands

### Correct Option:
The correct option is the one that matches:
- A matches with R
- B matches with S
- C matches with P
- D matches with Q