Which is not a cnidarian
(a) Obelia
(b) Jelly Fish
(c) Sea Anemone
(d) Beroe

Options

A. Obelia
B. Jelly Fish
C. Sea Anemone
D. Beroe.

Answer

To determine which organism is not a cnidarian, we need to analyze each option provided in the question:

1. **Obelia**:
- Obelia is a member of the phylum Cnidaria. Specifically, it belongs to the class Hydrozoa.
- It has two forms: the polyp (asexual form) and the medusa (free-swimming sexual form).
- Since Obelia is a cnidarian, it is not the correct answer.

2. **Jelly Fish**:
- Jellyfish are also part of the phylum Cnidaria and belong to the class Scyphozoa.
- They are characterized by their gelatinous bodies and possess a middle layer called mesoglea.
- As jellyfish are cnidarians, this option is also not the correct answer.

3. **Sea Anemone**:
- Sea anemones belong to the phylum Cnidaria and are classified under the class Anthozoa.
- They are primarily sedentary and exist only in the polyp form.
- Since sea anemones are cnidarians, this option is not the correct answer either.

4. **Beroe**:
- Beroe is not a cnidarian; it belongs to the phylum Ctenophora (also known as comb jellies).
- This makes Beroe the only organism in the list that is not classified as a cnidarian.

Based on the analysis, the correct answer is:

**(d) Beroe**

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