In fragmentation the parent body breaks into fragments and each fragment develop into an organism. It is not seen in
a) sponges
b) algae
c) protozoans
d) echinoderms

Options

A. sponges
B. algae
C. protozoans
D. echinoderms

Answer

To solve the question regarding fragmentation and identify which organism does not reproduce through this method, we will analyze each option provided:

1. **Understanding Fragmentation**: Fragmentation is a form of asexual reproduction where the parent organism breaks into fragments, and each fragment can develop into a new organism. This process is common in certain groups of organisms.

2. **Analyzing the Options**:
- **a) Sponges**: Sponges can reproduce through fragmentation. They can break apart, and each piece can grow into a new sponge.
- **b) Algae**: Many algae, especially filamentous types, can also reproduce through fragmentation. Pieces of algae can break off and develop into new individuals.
- **c) Protozoans**: Protozoans typically do not reproduce through fragmentation. Instead, they primarily reproduce through methods such as binary fission or budding.
- **d) Echinoderms**: Echinoderms, such as starfish, can reproduce through fragmentation. If a starfish loses a limb, that limb can regenerate into a new starfish.

3. **Conclusion**: Based on the analysis, the organism that does not reproduce through fragmentation is **c) protozoans**.

### Final Answer:
The answer is **c) protozoans**.