Which one of the following is not a feature of the nervous system of Planaria?
Correct answer: C. No specialized sensory organs are present.
- A. Nuerons are differentiated into sensory, motor and associative neurons.
- B. Nerves are present.
- C. No specialized sensory organs are present.
- D. All of the above.
Explanation
1. Planaria is a flatworm and belongs to the phylum Platyhelminthes. 2. It is the most primitive animal with a Central Nervous System (CNS) located on the ventral side of the body. 3. Nervous system consists of a mass of cerebral or cephalic ganglion appearing like an inverted U-shaped brain. 4. Ventrally from below the ganglia arise a pair of Ventral Nerve Cords (VNC) or long nerve cords. These are interconnected to each other by transferring nerve or commissure in a ladder-like manner. 5. The PNS include sensory cells arranged in lateral cords in the body.Therefore, option C is not correct.
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