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An example of animals in which mesoderm ...

An example of animals in which mesoderm occurs as scattered pouches between ectoderm and endoderm is

A

Filaria worm

B

Tape worm

C

Earth worm

D

Lancet

Text Solution

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The correct Answer is:
To solve the question, "An example of animals in which mesoderm occurs as scattered pouches between ectoderm and endoderm is," we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Terms**: - Ectoderm: The outermost layer of cells in an embryo. - Endoderm: The innermost layer of cells in an embryo. - Mesoderm: The middle layer of cells in an embryo, which can develop into various tissues and organs. 2. **Identify the Type of Organism**: - The question specifies that we are looking for an organism where the mesoderm is not a continuous layer but occurs as scattered pouches. This characteristic is typical of organisms in the phylum Aschelminthes or Nemathelminthes (commonly known as roundworms). 3. **Evaluate the Options**: - The options given are: - A) Filaria worm - B) Tapeworm - C) Earthworm - D) Lancet 4. **Analyze Each Option**: - **Filaria worm**: This is a type of roundworm, and it fits the description of having mesoderm as scattered pouches. - **Tapeworm**: Belongs to the phylum Platyhelminthes, where the mesoderm is a continuous layer, not scattered pouches. - **Earthworm**: This organism is segmented and has a well-defined mesoderm layer, not scattered pouches. - **Lancet**: This is a type of lancelet (a chordate), which also has a continuous mesoderm layer. 5. **Conclusion**: - Based on the analysis, the correct answer is **A) Filaria worm**, as it is the only organism listed that has mesoderm occurring as scattered pouches between ectoderm and endoderm. ### Final Answer: The example of animals in which mesoderm occurs as scattered pouches between ectoderm and endoderm is **Filaria worm**.
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