8421649
Description
Flashcards by Matshidiso Molete, updated more than 1 year ago
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Created by Matshidiso Molete
almost 9 years ago
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| Question | Answer |
| evolution | gradual process in which life forms change over time |
| aerate | to introduce oxygen |
| gizzard | a specialised stomach made of strong muscle tissue to help with digestion |
| phylogenetic tree | branching diagram showing the inferred evolutionary relationships between species |
| body plan | plan for the way the body of an organism is laid out |
| asymmetrical | body plan with no axis of symmetry |
| sessile | animals permanently attached to a substrate |
| radial symmetry | body parts arranged regularly around a central axis of symmetry |
| longitudinal | along the length |
| bilateral symmetry | configuration of a body that can be divided longitudinally into two halves that are mirror images |
| motile | capable of independent locomotion |
| anterior | the head end |
| posterior | end opposite the head |
| marine | living in sea water |
| cephalisation | an evolutionary trend in the animal kingdom toward centralisation of neural and sensory organs in the head or anterior region of the body |
| Germinal layer | layer produced by embryonic development of different kinds of cells |
| mesoderm | the middle layer of cells in triploblastic animals |
| specialised | has a structure with a particular function |
| diploblastic | animals formed from two germ layers |
| mesoglea | a middle layer of a jelly-like material in diploblastic animals |
| triploblastic | describing animals formed from three germ layers |
| coelom | body cavity formed by a split in the mesoderm |
| acoelomate | animal without a body cavity |
| coelomate | animal with a body cavity |
| haemocoel | a blood-filled body cavity often present in invertebrates |
| osculum | a mouth-like opening in sponges through which water and wastes exit |
| paralysed | cannot move |
| dorsoventrally | referring to the view from the top to the bottom surface of an animal |
| hydrostatic skeleton | a fluid-filled cavity under pressure |
| appendages | parts of the body that are attached but move separately (e.g. legs) |
| notochord | a rod of cells along the dorsal side of a chordate's embryos |
| protostomes | during the development of the embryo the mouth develops first |
| deuterostomes | during the development of the embryo the anus forms first |
| diversity | having a variety of different species in an area |
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