Grade 7 Unit 7: Introduction to Cells PDF

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Once the file has loaded, edit this or any offline presentation program. presentation using Google Slides. 1 Grade 7 Unit 7: Introduction to Cells Science Lesson 2 Unicellular vs. Multicellular Organisms Science  Learning Competency At the end of this lesson, the learners should be able to recognize that some organisms consist of a single cell (unicellular) like bacteria and some consist of many cells (multicellular) like a human. 4  Learning Targets At the end of this lesson, the learner should be able to do the following: Understand the distinction between unicellular and multicellular organisms. Recognize examples of each type. 5 Introduction Have you ever wondered about the tiny building blocks of life and how they form the vast ecosystems around us?  Introduction From the smallest atoms to the largest ecosystems, everything is connected in the wonderful world of biology. Introduction Let us start our journey with unicellular organisms, the simplest form of life, which play a crucial role in both ecosystems and human health.  Essential Question How do the simplest forms of life, like unicellular organisms, contribute to the complexity and diversity of entire ecosystems?  Warm-Up The Great Survival Race Let us read a story about  Warm-Up Hidden World of Uni and Multy In a tiny, hidden world, two friends, Uni the amoeba and Multy the algae, lived in a bustling microscopic community. Uni, a single-celled creature, was known for its quick and straightforward growing method. It would split into two whenever it needed to make more of itself. Multy, a cluster of cells living together, grew more coordinated, with each cell having a specific job to do.  Warm-Up Hidden World of Uni and Multy One day, their world faced sudden and unpredictable changes. The water they lived in became warmer, and the nutrients they relied on started to vary wildly. This sudden shift caused a stir among all the tiny inhabitants.  Warm-Up Hidden World of Uni and Multy Uni, with its simple and speedy approach, began to adjust quickly. It would split and make more of itself whenever it found something good in the water. This rapid change seemed like a great strategy but it also had risks.  Warm-Up Hidden World of Uni and Multy Multy, though slower to grow, had a careful way of adding new parts to itself. Each new part had a special role and worked harmoniously with the others. This careful growth seemed slower but had its advantages in the changing world.  Warm-Up Hidden World of Uni and Multy As days passed, both Uni and Multy faced the challenges of their changing home in their ways. Uni's population saw quick changes, sometimes growing fast and at other times shrinking. Multy's growth was more steady and balanced, adapting slowly to the new conditions.  Warm-Up Reflect & Discuss 1. Multy grew slower than Uni. How might this slower growth be an advantage in the changing environment? 2. Based on the story, what can you infer about the benefits and challenges of being a unicellular organism like Uni compared to a multicellular organism like Multy? 3. If the environmental changes were permanent, which of the two, Uni or Multy, do you think would be better suited for long-term survival? Explain your reasoning.  Learn about It The Hierarchical Organization of Biological World Learn about It Unicellular Organisms Unicellular organisms perform all life functions using a single cell only. Can you describe the unicellular organisms shown in the next few slides? Learn about It Chlamydomonas A single-celled green alga that can move around using its two whip-like tails, known as flagella. It uses sunlight to make its food, just like plants. Learn about It Euglena A unique single-celled organism that acts like both a plant and an animal. It has a long tail for movement and can make its own food using sunlight, but can also eat other tiny organisms. Learn about It Paramecium Shaped like a slipper and is covered in tiny hair-like structures called cilia, which help it move and eat by sweeping food into its mouth. Learn about It Bacterium Incredibly small, single-celled organisms that come in different shapes and are found almost everywhere. They can be helpful, like those in our guts, or harmful, causing diseases. Learn about It Amoeba A blob-like organism that moves by changing its shape, extending parts of its body called pseudopods. It engulfs its food by wrapping itself around it. Learn about It Yeast A type of fungus and a single-celled organism used in baking and brewing. It feeds on sugars, producing carbon dioxide and alcohol as it grows. Did You Know The smallest bacterium can be as small as 0.2 micrometers—that is about 500 times smaller than a grain of sand! Learn about It Multicellular Organisms Consist of many cells that work together. Each cell type in a multicellular organism specializes in certain functions. Learn about It Multicellular Organisms Learn about It Differentiation Unspecialized cells, like stem cells, develop into specialized cells with specific functions  Learn about It Let us do an experiment to understand unicellular organisms better! Listen carefully to your teacher and perform the “Hay Infusion experiment.” Learn about It In what ways are unicellular and multicellular organisms similar and different? Learn about It What are the advantages and disadvantages of unicellular and multicellular life forms? Learn about It Why is it important to understand both unicellular and multicellular organisms?  Key Points Life is organized in a complex hierarchy from atoms to the biosphere. Unicellular organisms are single-celled entities that perform all life functions independently. Multicellular organisms are composed of multiple specialized cells. They demonstrate higher complexity and specialization. Understanding the biological hierarchy from unicellular to multicellular life forms provides insights into the complexity and diversity of life, highlighting the intricate interconnections within the biosphere. Synthesis How do the simplest forms of life, like unicellular organisms, contribute to the complexity and diversity of entire ecosystems? 34 Synthesis Can you synthesize the lesson by drawing a concept map or verbally summarizing the key points? 35 Synthesis What recent technological advancements have been made in studying cell structures, and how might these impact our understanding of environmental challenges? 36  Attribution Img00000 by Hunter Desportes is licensed under CC BY 2.0 via Flickr.  References Gould, J.L., & Keeton, Peregoy, Suzanne, and Owen F.W.T. Boyle.(1996). Biological Reading, Writing, Science. and Learning in ESL.W.W. Norton New York: & Company. Longman, 1997. Puzo, Mario. The Godfather. New York: Signet, 1978. 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