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Tissue absent Internal fertilization ...

Tissue absent
Internal fertilization
Development is indirect (larval stage is present)
Spongocoelate with ostia (many) and single osculum and canal system
Sexes are hermaphrodite.
The above characteristics belong to which of following -

A

Cnidaria

B

Porifera (sponges)

C

Platyhelminthes

D

Ctenophora

Text Solution

AI Generated Solution

The correct Answer is:
To determine which group of animals the given characteristics belong to, we can analyze each characteristic step by step: 1. **Tissue Absent**: This characteristic indicates that the organism does not have true tissues. In the animal kingdom, sponges (phylum Porifera) are known for lacking true tissues. **Hint**: Think about which animal phyla are known for their simple body structure without true tissues. 2. **Internal Fertilization**: This means that fertilization occurs inside the body of the organism. In sponges, fertilization can occur internally, which aligns with this characteristic. **Hint**: Consider which organisms typically have internal fertilization versus external fertilization. 3. **Development is Indirect (Larval Stage Present)**: This indicates that the organism undergoes a larval stage before reaching adulthood. Sponges exhibit this type of development, where they have a larval stage called a parenchymella. **Hint**: Recall which organisms have a life cycle that includes a larval stage. 4. **Spongocoel with Ostia (Many) and Single Osculum and Canal System**: Sponges have a unique body structure that includes a central cavity called the spongocoel, numerous small openings (ostia) for water intake, and a single larger opening (osculum) for water expulsion. They also have a canal system that helps in water circulation. **Hint**: Think about the anatomical features that are unique to sponges. 5. **Sexes are Hermaphrodite**: This means that the organism has both male and female reproductive organs. Most sponges are hermaphroditic, allowing them to produce both sperm and eggs. **Hint**: Consider which animal groups are known for having both reproductive systems. After analyzing all these characteristics, we can conclude that the correct answer is **Porifera (sponges)**, as they possess all the mentioned traits. ### Final Answer: The characteristics belong to **Porifera (sponges)**.
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