Animal Kingdom Flashcards
Organ system
Different groups of animals exhibit various patterns of complexities in organ systems.
Example of incomplete digestive system
Platyhelminthes
Asymmetrical animals
No general body plan
Or
Axis of symmetry that divides the body into mirror images halves
Radially symmetrical animals
Body parts are organised around the central axis
Body can be divided into 2 identical halves along radial plane
Bilateral symmetrical animals
Can be divided into identical right and left halves in only 1 plane
Example of triploblastic animals
From platyhelminthes to chordates
Germ layers are also called
Embryonic tissue layers
Who lackes tissue layers
Sponges
Use of germ layers
Cells differentiate into further organs and organ systems
Example of diploblastic animals
Coelenterates
What is mesoglea
Undifferentiated layer between endoderm and ectoderm in diploblastic animals which is gelatinous in nature.
Largest kingdom
Animal kingdom
Most diverse kingdom
Animal Kingdom
Animal Kingdom is also called as
Metazoa
Porifera/sponges
Primitive multicellular organisms having cellular level of organisation
Symmetry of sponges
Asymmetrical or radially symmetrical
2 layers of sponges
Outer pinacoderm n inner coanoderm
In between pinacoderm and choanoderm we have
Mesenchyme or mesoglea
Mesenchyme
Gelatinous non cellular with wandering amoebocytes
Pinacoderm encloses
Cavity called spongocoel
Spongocoel opens to the exterior by
Osculum
What are spicules
Internal needle like structures on skeleton of porifera
Spicules are in the form of
Spongin fibres
Sponges have
Water system or canal system
Ostia
Minute pores on body wall of sponges
Asexual reproduction in sponges
Invovles formation of external or internal buds called gemmules.
Examples of porifera
Spongilla - freshwater sponge
Euspongia - bath sponge
