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Sponges, Cnidarians, and Worms What Is an Animal? Animal Symmetry Sponges and Cnidarians Worms Table of Contents.

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Presentation on theme: "Sponges, Cnidarians, and Worms What Is an Animal? Animal Symmetry Sponges and Cnidarians Worms Table of Contents."— Presentation transcript:

1 Sponges, Cnidarians, and Worms What Is an Animal? Animal Symmetry Sponges and Cnidarians Worms Table of Contents

2 Sponges, Cnidarians, and Worms - What Is an Animal? Structure of Animals The cells of most animals are organized into higher levels of structure, including tissues, organs, and systems.

3 Sponges, Cnidarians, and Worms - What Is an Animal? Classification of Animals This branching tree shows how the major animal groups are related.

4 Sponges, Cnidarians, and Worms Asking Questions Before you read, preview the red headings. In a graphic organizer like the one below, ask a what or how question for each heading. As you read, write answers to your questions. What is a cell? A cell is the basic unit of structure and function in living things. What is the structure of animals? The cells of animals are organized into tissues, organs, and systems. What are the functions of animals? Animals must obtain food and oxygen, keep a stable environment within their bodies, reproduce, and move about to meet their needs. How are animals classified? Animals are classified according to how they are related to other organisms. QuestionAnswer - What Is an Animal?

5 Sponges, Cnidarians, and Worms Links on the Animal Kingdom Click the SciLinks button for links on the animal kingdom. - What Is an Animal?

6 Sponges, Cnidarians, and Worms End of Section: What Is an Animal?

7 Sponges, Cnidarians, and Worms Comparing and Contrasting As you read, compare and contrast the characteristics of animals with bilateral symmetry and radial symmetry in a Venn diagram like the one below. Write the similarities in the space where the circles overlap and the differences on the left and right sides. Radial SymmetryBilateral Symmetry Many lines of symmetry, no distinct front end, live in water, move slowly Balanced arrangement of parts, perform all the basic life functions One line of symmetry, halves that are mirror images, front end with sense organs, quick movement - Animal Symmetry

8 Sponges, Cnidarians, and Worms Links on Animal Symmetry Click the SciLinks button for links on animal symmetry. - Animal Symmetry

9 Sponges, Cnidarians, and Worms End of Section: Animal Symmetry

10 Sponges, Cnidarians, and Worms - Sponges and Cnidarians Sponges Structures surrounding the central cavity of a sponge are adapted for different functions.

11 Sponges, Cnidarians, and Worms - Sponges and Cnidarians Sponges The sexual reproduction of sponges involves a larval stage that moves. Adult sponges stay in one place.

12 Sponges, Cnidarians, and Worms Calculating a Rate To calculate the rate of water flow in a sponge, divide the volume of water that the sponge filters by the time it takes the water to pass through the sponge. Flow rate = Volume of water/Time For example, a marble-sized sponge filters 15.6 liters of water in a day. How many liters does it filter per hour? Practice Problem In four days, a sponge filters 1,200 L. What is its rate of water flow per day? 300 L/day - Sponges and Cnidarians

13 Sponges, Cnidarians, and Worms - Sponges and Cnidarians Cnidarians Cnidarians have two basic body plans, the vase-shaped polyp and the bowl-shaped medusa.

14 Sponges, Cnidarians, and Worms - Sponges and Cnidarians Cnidarians Cnidarians use stinging cells to capture food and defend themselves.

15 Sponges, Cnidarians, and Worms - Sponges and Cnidarians Cnidarians The life cycle of a moon jelly has both a polyp and a medusa stage.

16 Sponges, Cnidarians, and Worms Feature SpongesCnidarians Comparing and Contrasting As you read, compare and contrast sponges and cnidarians by completing a table like the one below. Body structureHollow body with pores Polyp or medusa, central body cavity, tentacles Cell type that traps foodCollar cellsStinging cells Method(s) of reproduction Sexual and asexual - Sponges and Cnidarians

17 Sponges, Cnidarians, and Worms End of Section: Sponges and Cnidarians

18 Sponges, Cnidarians, and Worms - Worms Characteristics of Worms Biologists classify worms into three major phylaflatworms, roundworms, and segmented worms.

19 Sponges, Cnidarians, and Worms - Worms Life Cycle of a Dog Tapeworm This flatworm is a parasite that lives in more that one host during its life cycle.

20 Sponges, Cnidarians, and Worms Roundworm Numbers Biologists counted all the roundworms living in a plot of soil. Then they calculated the percentage that lives in different depths of soil. - Worms

21 Sponges, Cnidarians, and Worms Roundworm Numbers In the first centimeter Reading Graphs: Where in the soil was the largest percentage of roundworms found? - Worms

22 Sponges, Cnidarians, and Worms Roundworm Numbers About 87% Calculating: What is the total percentage of roundworms found in the first 3-cm depth of soil? - Worms

23 Sponges, Cnidarians, and Worms Roundworm Numbers The deeper the soil, the fewer the worms Drawing Conclusions: What is the relationship between the depth of soil and the abundance of roundworms in the soil? - Worms

24 Sponges, Cnidarians, and Worms - Worms Segmented Worms Earthworms and other segmented worms have bodies made up of many linked sections called segments.

25 Sponges, Cnidarians, and Worms Using Prior Knowledge Before you read, write what you know about worms in a graphic organizer like the one below. As you read, write what you learn. 1.Worms are long and skinny. 2.Worms live in the ground and digest soil. 3.Worms are slimy and wriggly. 1.Worms have bilateral symmetry. 2.Some worms are flat. 3.Some worms live in water. 4.Some worms are parasites. 5.Worms have a nervous system. What You Know What You Learned - Worms

26 Sponges, Cnidarians, and Worms More on Worms Click the PHSchool.com button for an activity about worms. - Worms

27 Sponges, Cnidarians, and Worms End of Section: Worms

28 Sponges, Cnidarians, and Worms Graphic Organizer The Life of a Sponge Sponge releases sperm. Sperm enter another sponge and fertilize egg cell. Larva develops. Water currents carry away larva. Larva settles on a surface and develops into adult sponge.

29 Sponges, Cnidarians, and Worms End of Section: Graphic Organizer


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