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selkirk lesson 13
sponges, worms lord selkirk learning centre
| Question | Answer |
|---|---|
| Porifera | another name for sponges |
| Epidermal cells | a protective layer of cells on the outside of the sponge |
| Collar cells | cells on the inside of a sponge which trap food particles |
| Ameboid cells | cells in a sponge which can move around to distribute food |
| Gastrovascular cavity | main chamber of the sponge |
| Osculum | water flows out through this opening in a sponge |
| Spicules | small pointed structures which give a sponge its shape |
| Budding | asexual form of reproduction when a new organism grows on an existing organism |
| Regeneration | asexual form of reproduction when a new organisms grows from a section broken off an existing organism |
| Pores/porocytes | channels in the main part of a sponge where water enters |
| Coelenterata/cnidaria | a group of organisms which include hydras and jellyfish |
| Ectoderm | outside tissue layer of a hydra |
| Endoderm | inside tissue layer of a hydra |
| Mesoglea | jellylike substance between ectoderm and endoderm |
| Coelenteron | digestive cavity in hydra |
| Nematocysts | stinging cells |
| Radial symmetry | circular form |
| Polyp | form of a jellyfish which stays in one place |
| Medusa | form of a jellyfish which can move around |
| Hydra | small organism which is an example of a coelenterate or cnidarian |
| Hermaphroditic | possessing male and female sex organs |
| Asexual reproduction | offspring arise from a single parent |
| Sexual reproduction | requires the union of sperm and egg and exchange of genetic material |
| Platyhelminthes | flat worms |
| Planarians | flat worms |
| Bilateral symmetry | head and tail, left side and right side, dorsal side and ventral side |
| Pharynx | tube used to intake food |
| Protonephridia | cells used to collect waste water in an organism |
| Ectoderm | outside tissue layer |
| Mesoderm | middle tissue layer |
| Endoderm | inside tissue layer |
| Flame cells | collect and expel liquid wastes |
| Nematodes | round worms |
| Tube-within-a-tube | description of complete digestive system with mouth and anus |
| Annelida | segmented worm |
| Pharynx | part of the digestive tube which intakes food |
| Esophagus | part of the digestive tube which intakes food |
| Crop | part of digestive system where food is stored |
| Gizzard | part of digestive system where food is crushed |
| Ventral | stomach |
| Dorsal | back |
| Nephridia | collect waste water |
| Setae | bristles which help the worm to move |
Created by:
hilary
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