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**:
- The earthworm belongs to the phylum Annelida.
- The excretory organ in earthworms is called **Nephridia**.
- Therefore, we match **Earthworm (a)** with **Nephridia (r)**.

2. **Identify the Excretory Organ of Cockroach**:
- The cockroach belongs to the phylum Arthropoda.
- The excretory organ in cockroaches is known as **Malpighian tubules**.
- Therefore, we match **Cockroach (b)** with **Malpighian tubule (s)**.

3. **Identify the Excretory Organ of Rotifers**:
- Rotifers are a group of microscopic animals.
- They possess excretory structures known as **Flame cells**, which are also referred to as **Protonephridia**.
- Therefore, we match **Rotifers (c)** with **Protonephridia (p)**.

4. **Identify the Excretory Organ of Prawn**:
- Prawns also belong to the phylum Arthropoda.
- The excretory organ in prawns is known as **Green glands**.
- Therefore, we match **Prawn (d)** with **Green glands (q)**.

### Final Matching:
- **a. Earthworm** → **r. Nephridia**
- **b. Cockroach** → **s. Malpighian tubule**
- **c. Rotifers** → **p. Protonephridia**
- **d. Prawn** → **q. Green glands**

### Summary of Matches:
- A → R
- B → S
- C → P
- D → Q