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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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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