MHT CET 202622 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 22 April
- Shift
- Morning Shift
- Subject
- Biology
- Chapter
- Animal Kingdom
MHT CET 2026 · 22 April · Morning Shift · Biology · Animal Kingdom
In Planaria , the nervous system consists of ____.
In Planaria, the nervous system consists of ____.
Options
- Aa single ventral nerve cord, an inverted U shaped brain, a pair of eyes located ventrally
- Ba pair of ventral nerve cords, a pair of eyes located dorsally, an inverted U-shaped brain with ten branches of nerves arising from each ganglion
- Ca mass of cerebral ganglion with nine branches of nerves arising from each ganglion, a pair of ventral nerve cords interconnected by commissures, a pair of dorsally located eyes
- Dan inverted U-shaped brain, a pair of ventrally placed eyes, peripheral nerve plexus arising laterally from nerve cords
Correct answer
C. a mass of cerebral ganglion with nine branches of nerves arising from each ganglion, a pair of ventral nerve cords interconnected by commissures, a pair of dorsally located eyes
Step-by-step solution
The nervous system of Planaria is ladder-like. It consists of a bilobed brain or cerebral ganglia located in the head region. From each cerebral ganglion, nine branches of nerves arise to supply the anterior and lateral parts of the head.
Two longitudinal ventral nerve cords arise from the brain and extend posteriorly. These nerve cords are interconnected by transverse nerves called commissures, giving the nervous system its characteristic ladder-like appearance.
Additionally, Planaria possesses a pair of simple eyes (ocelli) that are located dorsally on the head.
Answer: a mass of cerebral ganglion with nine branches of nerves arising from each ganglion, a pair of ventral nerve cords interconnected by commissures, a pair of dorsally located eyes
Two longitudinal ventral nerve cords arise from the brain and extend posteriorly. These nerve cords are interconnected by transverse nerves called commissures, giving the nervous system its characteristic ladder-like appearance.
Additionally, Planaria possesses a pair of simple eyes (ocelli) that are located dorsally on the head.
Answer: a mass of cerebral ganglion with nine branches of nerves arising from each ganglion, a pair of ventral nerve cords interconnected by commissures, a pair of dorsally located eyes