Question

Ladder type of nervous system is found in
(1) Planaria
(2) liver fluke
(3) Earthworm
(4)Both 1 and 2

Answer 1

Answer:

The central nervous system has been described as "ladder-like" because of the nerves connecting the nerve cords. Flatworms have "auricles" that project from the side of the head. These auricles contain chemoreceptors that are used to find food.

Explanation:

Answer 2

Answer:

Option (1) Planaria is the correct option.

Explanation:

• The ladder-type nervous system is found in Planaria or Flatworms because the nerves are connected to the nerve cords.
• Liver fluke has well developed nervous system which is composed of the Brain that forms a cerebral ring around the pharynx, as well as pair of lateral cerebral ganglia and ventral ganglia. Anterior and posterior regions are supplied by nerves arising from the brain.
• Nervous system of earthworm consists of a primitive brain formed by fused ganglia, peripheral nerves, and a ventral nerve cord.

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