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ch. 9 zoology
zoology notes for chapter 9 sponges
Question | Answer |
---|---|
Kingdom | Animalia |
Phylum | Porifera means pore-bearing |
Domain | Eukarya |
What enters through pores bringing in food and oxygen? | Water |
Osculum | Large opening at the top where excess water leaves. |
Sessile | As adults attach to rocks. |
Dipleurula | Free-swimming larval stage. |
Fragmentation | Pieces break off and form a new sponge. |
Hollow | Inside body cavity of sponge. |
What is the outer? | Epidermis |
What is the inner? | Endoderm |
Mesenchyme or mesohyl | Jelly-like material between cell layers. |
Choanocytes | Line the gastrovascular cavity and capture food. |
Amebocytes | Digest and distribute food. |
Flagella | Spins to pull in water and food. |
Collar | Traps plankton (food) from water. |
Spongin | Skeleton made of network of protein fibers. |
Spicules | Are hard spears or star-shaped structures. |
Regenerate | Sponges can regrow lost body parts through mitotic cell division (asexual). |
Hermaphrodites | Produce both eggs and sperm which are formed from choanocytes. |
Sponges reproduce what? | Sexually by releasing eggs and sperm into the water from the osculum. |
Gemmules | Specialized buds (asexual reproduction) made to survive harsh weather (hot or cold). |
What do the gemmules contain? | Contain food, amebocytes, and a protective covering of spicules. |
Diffusion | Water currents bring food and oxygen to a sponge. The removal of waste and gas exchange. |
Ascon | Simplest and least common sponge body form. |
Sycon | The body wall appears folded (called incurrent canal). |
Leucon | The most complex sponge body form. |
Sponges gain food through what? | Filtration, trapping food items by the collar, active transport of nutrients and phagocytosis. |