The correct match is :

Question

Accepted Answer

Option 4, "Heteronereis – A sexual phase of Nereis," is the correct answer. Here's why:

1. **Explanation for Option 4:**
   - **Heteronereis** is indeed a sexual phase of the polychaete worm **Nereis**. During this phase, Nereis undergoes a transformation to become sexually mature. This transformation involves morphological changes, such as the development of parapodia and setae, which are adaptations for swimming. The Heteronereis phase is crucial for reproduction, as it allows the worms to move to the surface waters to spawn.

2. **Explanation for why other options are incorrect:**

- **Option 1: Neanthes – Botryoidal tissue**
     - **Neanthes** is a genus of polychaete worms, but it is not specifically associated with "botryoidal tissue." Botryoidal tissue refers to a type of tissue structure that resembles a cluster of grapes, which is not a characteristic feature of Neanthes.

- **Option 2: Chaetopterus – Lugworm**
     - **Chaetopterus** is a genus of marine polychaete worms known for their parchment-like tubes. They are not referred to as "lugworms." Lugworms belong to a different genus, typically Arenicola, and are known for their burrowing behavior in sandy beaches.

- **Option 3: Earthworm – Suckers**
     - **Earthworms** are terrestrial annelids that do not possess suckers. Suckers are typically found in leeches, which are a different subclass of annelids. Earthworms have a simple body structure with segments and setae for movement, but no suckers.

In conclusion, Option 4 is the correct match because Heteronereis is indeed a sexual phase of Nereis, while the other options incorrectly associate organisms with features or classifications that do not apply to them.