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Science Probe 8 2.2 94 Name: _____________________________ Due Date:_______________Block: _______ Section Title (pg. 43): __________________________________________________ 1 Read pages 43 -47 What is a micro-organism?________________________________________________________________ ______________________________________________________________________________________ What is a unicellular organism?____________________________________________________________ ______________________________________________________________________________________ 2 The Importance of Micro-organisms Micro-organisms can be harmful or beneficial, provide an example of each: Beneficial Harmful 2 Bacteria Bacteria are among the most ________________ and also the most ____________________ organisms on Earth. Bacteria are said to be very _________________ because they have ___________________ and changed little over several ________________ years. Some, like plants, can make their own __________. Others are ____________________. (Parasites can live only by _________________ the body of an 15 animal or a plant). Still others can live with little or no ___________________. There are bacteria in every ________________________ on Earth – even in ____________ _____________________. Bacteria, which are ________________________ cells, are different from animal and plant cells in that they have no ________________, no _________________________ and no _____________________. Label the diagram 6 Protists What is a protists?_______________________________________________________________________ ______________________________________________________________________________________ Why are protest unlike bacteria?____________________________________________________________ 2 ______________________________________________________________________________________ Plantlike Protists We describe some protists as being ____________________ because they are not true plants. They are similar to plants, however, because they contain ___________________ and produce their own 4 _____________ by __________________________. Diatoms Diatoms re found in both ______________ and _______________ water. They contain chlorophyll and can make their own _____________. Diatoms 4 are encased in two _________ _____________, which are joined together. Euglena Euglena are similar to both _____________ and _____________cells. If there is a lot of ______________, euglena act like ______________ and make their own food. With reduced sunlight, euglena act like 6 _________________ and begin _________________ upon smaller cells. Label the diagram: 8 Animal-like Protists Animal-like protists cannot make their own ____________ and must ______________ on things that are living or were once alive. They have all the _____________________ of an animal cell. Like euglena, 4 they have a ________________________ vacuole. Amoebae The amoeba is a ____________________ organism that changes ________________ as it moves. It moves by stretching out a _________________ of cytoplasm, called a ______________________. The pseudopod anchors to an object, and the rest of the amoeba is __________________ towards it. This method of movement is also used by the ____________ blood cells of animals, including those in your 8 _________________ ____________________. The amoeba uses the pseudopod for ________________. Describe the diagram: 8 Paramecia The paramecium, like amoeba, uses structures designed for ________________________ to help it ___________. Thin hairlike structures, called ________________, beat in __________________ to create 7 water currents that move the paramecium. Cilia around the paramecium's _____________ _____________ create a current that draws _________________ into the groove. Bacteria and other smaller cells are the main _______________ ___________________ for the paramecium. 8 Fungi Fungi include many ___________________ that are multicellular, as well as some that are ___________________. Bread mould, mushrooms, and puff balls are well-known ______________. 6 Harmful fungi include those that cause _____________, _________ _______ _____________, and ________________ foot. Yeast, the Unicellular Fungus Yeast is one of the few ________________________ fungi. There are many different _______________ of yeast. Like animal cells, yeast do not have _______________________ and must rely on other organisms as their source of energy. 3
