NEET BIOLOGY

Detailed explanation-1: -The bilaterally flattened body of flatworms preserves a common organization of the central nervous system (CNS). The CNS of flatworms consists of: (i) the orthogon, composed of main longitudinal nerve cords and transverse commissures that form a ladder-like network.

Detailed explanation-2: -Flatworms have a cephalized nervous system that consists of head ganglion, usually attached to longitudinal nerve cords that are interconnected across the body by transverse branches.

Detailed explanation-3: -Flatworms (phylum Platyhelminthes) are simple animals that are slightly more complex than a cnidarian.

Detailed explanation-4: -Flatworms (Planaria) It does have a nerve net, but these are connected by long nerve cords. These cords are connected to cerebral ganglia located in the head region. The central nervous system has been described as “ladder-like” because of the nerves connecting the nerve cords.

Detailed explanation-5: -The ancient flatworms were the first animals to develop a central nervous system and a head with a brain.