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7th Grade Science
Sponges and Cnidarians
| Question | Answer |
|---|---|
| Describe the animal known as a sponge | covered in pores. they are not able to move, and they are multicellular, invertebrates that live in the water asymmetry |
| where are sponges found? | they can be found in dark spaces in any body of water or growing on a rock |
| What is the scientific term for sponge? | porifera (sack of cells) |
| What is the function of oscula? | large opening to the outside where the water is passed through - exits the sponge near the oscula |
| Where are collar cells located and what are two functions of these specialized cells? | Where: within the canals #1 pump water #2 remove waste |
| Jelly like cells or _____________ , takes the food to other cells within the sponge | amebocyte |
| The skeleton of the sponge is composed of tiny needle-like splinters called ___________________mesh of protein called spongin or a combination of both. | spiculus |
| Explain the process of reproduction in the sponge | a sponge produces hermaphroditic gamete. The spawn is the offspring. Many animals live in planktonic. The larvae is the of an animal. |
| List four ways sponges defend themselves. | 1. difficult to consume spicules 2. able to release chemicals that taste bad 3. able to regenerate 4. some of their bright colors warn predators |
| how are sponges used by humans? | Luxury bath items or to clean dishes |
| How can sponges be used in medical applications? | They are being used to develop new antibiotics. |
| List 3 reasons why sponges are threatened | 1. Human reclamation/fishing/hunting 2. pollution 3. being broken by humans/construction/ship anchors 4. climate change |
| Where are Cnidarians found? | They are found in many aquatic environments. |
| Describe the type of symmetry exhibited by cnidarians | Radial symmetry based on the polyp and medusa body plans |
| What do Cnidarians eat? | "organisms" ranging in size from plankton to animals several times larger than them. |
| two basic body plans of cnidarians | polyp mobile medusa stays in place |
| what is nematocysts? | a specialized cell in the tentacles of a jellyfish |
| how do humans use cnidarians | as a building material in several areas |
| how do humans place the survival of cnidarians in dangers | reclamation , pollution, tram pling and poaching |
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