Question

Draw the diagram of Planaria and label the following parts:

(i) Eyes (ii) Gastrovascular cavity (iii) Pharynx

Answer 1

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Answer 2

Planaria:

• They are free-living invertebrates that employ motile cilia for locomotion.

• Their body is highly conserved, with a 9 + 2 axoneme and a full complement of inner and outer arm dynein motors.

• They are triploblastic, acoelomate, and bilaterally symmetrical metazoans that belong to the class Turbellaria.

• They are genetically amenable and defects that compromise the function and structure of the cilia are not detrimental to their overall health, making them an ideal system for cilia gene loss-of-function studies.

Planarian eyes:

• The eye consists of two tissue types:

1. The light-capturing pigment cells.
2. The photoreceptor neurons transduce photons into signals sent to the brain.

Planarian Gastrovascular cavity:

• Planarians have a gastrovascular cavity with one opening (a sac-like gut).

• Digestions take place here.

• They do not have a respiratory system, they have pores that allow oxygen to enter their body.

Planarian Pharynx:

• They serve as both the entrance and exit to the digestive system
• It is a complex organ consisting of multiple tissues including neurons, muscle, epithelial cells, and secretory cells.

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