Control and Co-ordination — BIOLOGY STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYControl and Co-ordination4 Marks
Question
Nervous system of Planaria.
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Answer
Planaria is a flatworm and belongs to the phylum Platyhelminthes.
It is the most primitive animal with a Central Nervous System (CNS) located on the ventral side of body.
Nervous system consists of a mass of cerebral or cephalic ganglion appearing like an inverted U-shaped brain.
Ventrally from below the ganglia arise a pair of Ventral Nerve Cords (VNC) or long nerve cords. These are interconnected to each other by transfer nerve or commissure in a ladder like manner.
The PNS include sensory cells arranged in lateral cords in the body.
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