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17 Cards in this Set
- Front
- Back
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What characteristics do all animals share? |
Animals are multicellular, have cells without walls, are heterotrophs by ingestion, and have a blastula stage during development |
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What habitat did animals most likely arise from and what time period |
Animals probably originated in the oceans in Precambrian times. Today’s major groups of animals arose during Precambrian and Cambrian times. |
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Which animals have true tissues and which have organs? |
All animals except sponges have true tissues. All animals except sponges and cnidarians have organs |
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What is radial symmetry? |
In radial symmetry, many planes can divide the animal into mirror halves |
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what bilateral symmetry? |
In bilateral symmetry, only one plane divides the animal into mirror halves |
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what is a coelom |
A coelom is a body cavity that is completely lined with mesoderm |
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what is pseudocoelom? |
pseudocoelom is a body cavity that is partly lined with mesoderm and partly lined with endoderm |
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What are the two main types of a digestive tract |
Incomplete and complete digestive tracts are the two main kinds of digestive tracts |
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what advantage does segmentation confer? |
Segmentation increases flexibility and allows specialized body functions to be concentrated in the segments of one region of the body |
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how is a sponges body different from other animals? |
A sponges body does not contain true tissue. |
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How do sponges feed? |
Sponges are filter feeders, using flagella on their collar cells to extract organic particles from water. The collar cells digest the food and share the nutrients with adjacent cells. |
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what is the function of spicules? |
Spicules help support and defend a sponge |
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How do sponges reproduce sexually and asexually? |
Sponges reproduce sexually by shedding sperm into the water. These are taken in to the body of another sponge where they fertilize egg cells. The new sponge develops within the body of its parent. Sponges reproduce asexually by budding or by fragmentation |
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What features do all Cnidarians share? |
All cnidarians have radial symmetry and incomplete digestive tracts. They are named for their stinging cells |
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what is the difference between a polyp and a medusa |
A polyp is a sessile life cycle stage of a cnidarian. A medusa is the free-swimming life cycle stage of a cnidarian |
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How do Cnidarians Feed? |
Cnidarians are carnivores that feed by catching prey with their tentacles, stinging it with cnidocytes, and stuffing it into their mouths |
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How do Cnidarians reproduce |
Reproduction: Sexual reproduction involves shedding sperm and eggs into the water, where they unite to form a zygote. The zygote develops into a polyp stage that in turn undergoes asexual reproduction to produce new medusas |
