Muscles in sponges are

Options

A. Striated
B. Smooth
C. Both striated and smooth
D. None of these

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question asks about the type of muscles in sponges. Sponges belong to the phylum Porifera.

2. **Understand the Characteristics of Sponges**: Sponges are known for being pore-bearing organisms (the term "Porifera" means "pore bearer"). They are also acellular (Acelomate), meaning they do not have a true body cavity, and they exhibit asymmetry (they do not have a symmetrical shape).

3. **Examine the Structure of Sponges**: Sponges have a unique water canal system. They have small openings called ostia through which water enters, a central cavity known as the spongocoel, and a larger opening called the osculum through which water exits.

4. **Muscle Presence in Sponges**: Unlike many other animals, sponges do not have true muscles. They lack muscle tissue entirely. Instead, they have specialized cells called choanocytes that help in water movement and feeding.

5. **Determine the Correct Answer**: Since sponges do not possess any muscles, the options provided (striated, smooth, both, or none) lead us to conclude that the correct answer is option D: none of these.

**Final Answer**: The muscles in sponges are none of these (Option D).

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