Which type of body organisation occurs in ctenophores ?

Options

A. Cellular level
B. Tissue level
C. Organ level
D. Organ-system level

Answer

To determine the type of body organization that occurs in ctenophores, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Body Organization Levels**:
- Body organization in animals can be classified into different levels: cellular level, tissue level, organ level, and organ system level.
- Cellular level: Cells are the basic unit of life, and organisms at this level do not have tissues.
- Tissue level: Groups of similar cells work together to perform a specific function.
- Organ level: Different types of tissues combine to form organs.
- Organ system level: Organs work together to form systems that perform complex functions.

2. **Identify Ctenophores**:
- Ctenophores, also known as comb jellies, are marine invertebrates belonging to the phylum Ctenophora.

3. **Analyze Ctenophore Structure**:
- Ctenophores possess a simple body structure that consists of two main layers of cells (epidermis and gastrodermis) with a jelly-like substance (mesoglea) in between.
- They do not have specialized organs or organ systems like higher animals.

4. **Determine the Level of Organization**:
- Since ctenophores have a body structure that consists of tissues but lack complex organs and organ systems, they exhibit a tissue level of organization.

5. **Conclusion**:
- Therefore, the type of body organization that occurs in ctenophores is the tissue level.

### Final Answer:
Ctenophores exhibit a **tissue level of organization**.

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