Protists Andy Dough-man Kris Cherry Aleksander Falcon Protists.
Protists science grade 7
description
Transcript of Protists science grade 7
![Page 1: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/1.jpg)
Protists
- a protist is a one- or many- celled organism that lives in wet surroundings.
- all protists have eukaryotic cells (cells with a nucleus and other membrane-bound organelles)
- protists may be plant-like, animal-like, or fungus-like
(Copy Table 1 on page 211)
![Page 2: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/2.jpg)
![Page 3: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/3.jpg)
- Some protists reproduce asexually, resulting in genetically identical offspring
- Some protists reproduce sexually, and produce genetically different offspring
- Scientists think that protists evolved from a one-celled organism with a nucleus and other structures.
![Page 4: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/4.jpg)
• - Plantlike protists have cell walls and contain chlorophyll
![Page 5: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/5.jpg)
• - Animal-like protists are separated into groups according to how they move
![Page 6: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/6.jpg)
• - Funguslike protists have characteristics found in both fungi and protists
![Page 7: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/7.jpg)
• Algae are plantlike protists. - algae contain chlorophyll and produce oxygen as a
result of photosynthesis
- There are many different types of algae. They include diatoms, dinoflagellates, red or green algae commonly called seaweed, and brown algae known as kelp.
![Page 8: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/8.jpg)
• - Dinoflagellates have two flagellum, long, thin, whiplike structures used for movement.
![Page 9: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/9.jpg)
• - Protozoans are one-celled, animal-like protists - Protozoans can live in water, soil, and in living or dead organisms
![Page 10: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/10.jpg)
• - Protists called ciliates are covered in cilia, short, thread-like structures that extend from the cell membrane.
• - cilia help the organism to move quickly in any direction.
• - a Paramecium is a ciliate that has two nuclei
• - Paramecium are found in freshwater environments and consume bacteria.
![Page 11: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/11.jpg)
• - Pseudopods are extensions of cytoplasm used by some protists to move through their environment.
• - the word “pseudopod” means “false foot”
![Page 12: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/12.jpg)
http://www.youtube.com/watch?v=PsYpngBG394
![Page 13: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/13.jpg)
![Page 14: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/14.jpg)
• Fungi
- Fungi are organisms that grow in soil and have a cell wall. Because they do not contain chlorophyll or have the structures of plants, they cannot be categorized as plants.
• - Most species of fungi are many-celled
![Page 15: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/15.jpg)
![Page 16: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/16.jpg)
• - Hyphae are the mass of threadlike tubes which form the body of a fungus
![Page 17: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/17.jpg)
• - Most fungi are saprophytes.
- A saprophyte is an organism that gets food by absorbing dead or decaying tissues of other organisms
- Some species of fungi are parasites, obtaining their food directly from living things
![Page 18: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/18.jpg)
![Page 19: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/19.jpg)
• - Fungi can reproduce sexually or asexually. In either case, fungi reproduce through spores
• - A spore is a waterproof reproductive cell that can grow into a new organism.
http://www.youtube.com/watch?v=A1uQ5rXmbO8
![Page 20: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/20.jpg)
• - Common fungi include mushrooms and yeast.
- yeasts can reproduce by budding, a form of asexual reproduction in which a new organism forms on the side of a parent organism.
![Page 21: Protists science grade 7](https://reader036.fdocuments.in/reader036/viewer/2022062319/5579db94d8b42aa54d8b4621/html5/thumbnails/21.jpg)
Lichen• - a lichen is an organism that is made up of
fungus and either a green algae or a cyanobacterium.
- lichens are food sources for many animals. - lichens are used to determine pollution levels in
an area