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Principal cell types present in the body...

Principal cell types present in the body wall of sponges are

A

Pinacocytes,porocytes,choanocytes,amoebocytes

B

Pinacocytes,choanocytes,amoebocytes,nephrocytes

C

Choanocytes,nerve cells,amoebocytes,nephrocytes

D

Choanocytes,porocytes,nephrocytes,Amoebocytes

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The correct Answer is:
### Step-by-Step Solution: 1. **Identify the Question**: The question asks for the principal cell types present in the body wall of sponges, which belong to the phylum Porifera. 2. **Understand Sponge Structure**: Sponges have a simple body structure that includes various types of cells. The body wall of sponges is made up of different specialized cells that perform specific functions. 3. **List the Principal Cell Types**: - **Pinacocytes**: These are flat cells that cover the outer surface of the sponge. They are involved in maintaining the shape of the sponge and in the movement and adhesion of cells. - **Porocytes**: These cells are responsible for forming the pores (ostia) in the sponge's body wall. Water enters the sponge through these pores. - **Choanocytes**: Also known as collar cells, they line the inner chambers of the sponge and are responsible for creating water currents and capturing food particles. - **Amoebocytes**: These are mobile cells that can move around within the sponge. They play a role in digestion, nutrient transport, and the removal of waste. 4. **Eliminate Incorrect Options**: - Nephrocytes are not found in sponges; they are excretory cells found in insects. - Nerve cells are also not present in sponges as they lack a nervous system. 5. **Conclusion**: The principal cell types present in the body wall of sponges are: - Pinacocytes - Porocytes - Choanocytes - Amoebocytes ### Final Answer: The principal cell types present in the body wall of sponges are Pinacocytes, Porocytes, Choanocytes, and Amoebocytes. ---
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