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Annelids have a central nerve cord which...

Annelids have a central nerve cord which is
(a) Hollow
(b) Impermeable to K + ions
(c) Dorsal
(d) Ventral

A

Hollow

B

Impermeable to `K^(+)` ions

C

Dorsal

D

Ventral

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct answer regarding the central nerve cord of annelids, let's analyze each option step by step: 1. **Understanding the Structure of Annelids**: Annelids, which include earthworms and leeches, have a complex nervous system. They possess a central nervous system that is crucial for their functioning. 2. **Analyzing Option (a) Hollow**: The central nerve cord of annelids is not hollow. Instead, it is solid. Therefore, this option is incorrect. 3. **Analyzing Option (b) Impermeable to K+ ions**: The nerve cord is not impermeable to potassium ions (K+). In fact, it is permeable to these ions, allowing for proper nerve function. Thus, this option is also incorrect. 4. **Analyzing Option (c) Dorsal**: While annelids have a dorsal prostomial brain, the central nerve cord itself is not dorsal. Instead, it is located ventrally. Therefore, this option is incorrect. 5. **Analyzing Option (d) Ventral**: The correct description of the central nerve cord in annelids is that it is ventral. The nerve cord is a ventral ganglionic nerve cord, making this option correct. **Conclusion**: The correct answer is (d) Ventral. ---
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