Ephyra is young stage of

Options

A. Obelia
B. Sea Anemone
C. Physalia
D. Aurelia.

Answer

To solve the question "Ephyra is the young stage of?", we can follow these steps:

### Step 1: Understand the term "Ephyra"
Ephyra is a developmental stage in the life cycle of certain jellyfish. It is important to identify which organisms have this stage in their life cycle.

### Step 2: Analyze the options provided
The options given are:
1. Obelia
2. Sea anemone (C. anemone)
3. Physalia
4. Aurelia

### Step 3: Identify the larval stages of each organism
- **Obelia**: This organism belongs to the class Hydrozoa and has a planula larva, not an ephyra.
- **Sea anemone (C. anemone)**: This also belongs to the class Anthozoa and has a planula larva as well.
- **Physalia**: This organism, commonly known as the Portuguese man o' war, also belongs to Hydrozoa and has a planula larva.
- **Aurelia**: This organism is a jellyfish that belongs to the class Scyphozoa and has an ephyra stage in its life cycle.

### Step 4: Conclusion
Since Ephyra is specifically the young stage of Aurelia (a jellyfish), the correct answer is:
**Ephyra is the young stage of Aurelia.**