Invertebrates Short Answers Flashcards
Why are Sponge Layers not Tissues?
They aren’t integrated.
What is the Difference between Parazoa and Eumetazoa?
Parazoa lack true tissues.
What make a Tissue ‘Integrated’?
It is coordinate in its function.
What are the 3 Steps of Progression for Classifying Organisms?
2 kingdoms -> Whittaker’s 5 kingdoms (1960) -> Woese’s 3 domains and many kingdoms (1990).
What were the 2 Stages of Eukaryotes Evolution?
Increased size and compartmentalisation, symbiogenesis.
How many Times did Eukaryotes Evolve in Stages?
Twice - 1st time led to mitochondria and animals, 2nd time led to plastids and plants.
What is the Function of Mesohyl in Sponges?
Nutrients, gametes, secrete skeleton.
What are the 4 Consequences of a Pseudocoelom?
Organs can develop and function independently, organs cushioned, provides hydrostatic skeleton, free diffusion of nutrients/wastes.
What are the 3 Consequences of a True Coelom?
Gut develops muscles for independent muscles, gut develops blood vessels/nerves, mesenteries formed to suspend organs.
What are the 2 Reasons Insects are so Successful?
Protective cuticle, flight.
What is Flight used for?
Dispersal, colonising new habitats, escaping predators.
What are the Big 5?
Coleoptera, hempitera, diptera, lepidoptera, hymenoptera.
Why do Protostomia have Spiral Cleavage?
Plane of cell division is diagonal to vertical axis.
Why do Deuterostomia have Radial Cleavage?
Plane of cell division perpendicular or parallel to vertical axis.
Why do Protostomia have Derterminate Cleavage?
Fate of each cell determined early in development.
