Week 3 - Lesson 1- Varity of Living organisms 2.pptx

Igcse edexcel

1. The variety of Living Organisms

2. Learning Skill- Critical Thinking How does the diversity of living organisms within an ecosystem contribute to its stability and resilience?

3. Learning Objective: To describe common features of eukaryotic organisms . Success Criteria: Identify the basic features of eukaryotic cells. List the organelles commonly found in eukaryotic cells and their basic functions. Describe the similarities between plant and animal eukaryotic cells. Compare the unique features of plant and animal eukaryotic cells, such as chloroplasts and cell walls in plants. Explain how the common features of eukaryotic cells contribute to the overall functions and processes within plants and animals. Topic: The variety of living organisms Curriculum Reference : Describe the common features shown by eukaryotic organisms: plants, animals, fungi and protoctists

4. Key Vocabulary Unicellular Chloroplast Photosynthesis Multicellular Cytoplasm Cell wall

5. Teach and model/Investigation

6. The Eight Life Processes Movement – Moving around! Respiration – making energy from food and oxygen Sensitivity – detecting our environment Control – controlling internal conditions Growth – growing into adults Reproduction – having babies! Excretion – getting rid of waste Nutrition - feeding M R S C. G R E N Am I dead or alive? We can ask my friend Mrs C Gren for help:

7. Organisms Animals Plants Prokaryotes Protists Fungi Jellyfish, worms, molluscs, amphibians, fish, reptiles, birds and mammals. Seed bearing plants and non-seed bearing plants Bacteria and primitive algae Single-celled organisms Moulds, mushrooms and toadstools

8. Four Kingdoms of Eukaryotic Organisms Eukaryotic organisms can be classified into one of these four “kingdoms”: Animals Plants Fungi Protoctists Multicellular, don’t have cell walls or chlorophyll Multicellular, have cell walls and chlorophyll Multicellular, have cell walls but no chlorophyll Unicellular, have a nucleus

9. More Information on Plants Fact 3 – They store carbohydrates as starch or sucrose. Fact 4 – examples of plants include cereals and herbaceous legumes. Fact 1 – their cells contain chloroplasts and can carry out photosynthesis. Fact 2 – The cell walls contain cellulose.

10. More Information on Animals Fact 3 – They store carbohydrates as glycogen Fact 4 – unlike plants, they can move around. Fact 5 – examples of animals include mammals and insects. Fact 1 – their cells do not contain chloroplasts and can not carry out photosynthesis. Fact 2 – Animal cells have no cell wall

11. More Information on Fungi Fact 3 – they store glucose as glycogen. Fact 1 – their bodies are normally organised into a mycelium made from thread-like structures called hyphae, which contain many nuclei. Fact 2 – most are multi-celled but some have one cell with cell walls made from chitin and they feed by excreting digestive enzymes onto food and then absorbing the products (“saprotrophic nutrition”). Fact 4 – examples of fungi include mucor and yeast.

12. Mid plenary: Which of the following is a common feature of all eukaryotic cells? A) Cell wall B) Nucleus C) Chloroplast D) Flagellum Which organelle is responsible for energy production in eukaryotic cells? A) Ribosome B) Mitochondria C) Endoplasmic reticulum D) Golgi apparatus What feature distinguishes plant eukaryotic cells from animal eukaryotic cells? A) Cell membrane B) Nucleus C) Cell wall D) Mitochondria Write brief answers: Describe the function of the nucleus in eukaryotic cells and provide an example of a eukaryotic organism where this function is crucial. Explain how the presence of chloroplasts benefits plant cells and give an example of a plant where this feature is essential. Compare and contrast the roles of the mitochondria and ribosomes in eukaryotic cells. Provide examples of cells where these organelles are particularly important.

13. Self access using pink pen Multiple Choice Questions (MCQs) B) Nucleus B) Mitochondria C) Cell wall Short Questions The nucleus controls the activities of the cell by storing genetic information (DNA) and coordinating cell growth, metabolism, and reproduction. For example, in human cells, the nucleus is crucial for regulating protein synthesis and cell division. Chloroplasts enable plant cells to perform photosynthesis, converting light energy into chemical energy stored in glucose, which provides food for the plant. An example is the leaf cells of a maple tree, which contain chloroplasts essential for capturing sunlight and producing energy. Mitochondria are responsible for producing ATP (energy) through cellular respiration, essential for powering various cellular processes. Ribosomes are responsible for protein synthesis, translating genetic instructions into proteins. For instance, muscle cells have many mitochondria to meet high energy demands, while pancreatic cells have numerous ribosomes for producing digestive enzymes.

14. Link to UAE/Real life application Fungi : Adaptations : Fungi in the UAE, such as certain types of mushrooms and lichens, have adapted to survive in arid conditions by forming symbiotic relationships with plants or being resilient to extreme environments. Role : Fungi play a crucial role in decomposing organic matter, recycling nutrients back into the soil, and forming mutualistic relationships with plants (e.g., mycorrhizae) to aid in nutrient uptake.

15. Plenary

16. Learning objective: Describe the common features shown by eukaryotic organisms. Assessment Criteria including WAGOLL Exemplars Starting Approaching Meeting Exceeding Identify basic features of eukaryotic cells with examples. Example : "I can identify the nucleus, cytoplasm, and cell membrane in eukaryotic cells, such as those in human and plant cells." List common organelles and their functions in eukaryotic cells with examples. Example : "I can list organelles like mitochondria (energy production) and ribosomes (protein synthesis) in examples such as animal and plant cells." Describe the similarities between plant and animal eukaryotic cells, using specific examples. Example : "I can describe that both plant and animal cells have a nucleus and mitochondria, using examples from human cells and elodea (aquatic plant) cells." Compare the unique features of plant and animal eukaryotic cells with examples. Example : "I can compare that plant cells have cell walls and chloroplasts, while animal cells have lysosomes, using examples like leaf cells and skin cells." Explain how the common features of eukaryotic cells contribute to their functions, with examples. Example : "I can explain how the presence of mitochondria in eukaryotic cells, such as muscle cells, provides energy for cell functions, and how the chloroplasts in plant cells enable photosynthesis."

17. Additional Support/reference content/video/reading Support sheet