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Category: ESS Topic 2 Ecology

  • ESS 2.1.7 Tipping Point Vs Keystone Species

    ESS 2.1.7 Tipping Point Vs Keystone Species

    Learning objectives Part 1: The Concept of Tipping Point Tipping Points and Ecosystem Stability Measuring Changes in Ecosystems Due to Human Activity Human impacts on ecosystems include: Factors influencing ecosystem change: Example study locations: Methods for studying human impact: Part 2: The Keystone Species and Trophic Cascade Keystone Species Trophic Cascade Part 3: Case Studies…

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  • ESS 2.5.3 [AHL]Productivity and Factors of Succession

    ESS 2.5.3 [AHL]Productivity and Factors of Succession

    Learning Objectives Part 1: Influences on the type of community that develops in a succession Influenced by bottom-up and top-down factors Part 2: Changes in net productivity and gross productivity in a community undergoing succession Part 3: K-strategist and r-strategist Species [Recall] r-Strategist Species r-strategists are species that focus on high reproductive rates and rapid…

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  • ESS 2.5.2 [Case Study] Primary and Secondary Succession

    ESS 2.5.2 [Case Study] Primary and Secondary Succession

    Learning Objectives Part 1: Primary Succession Case Study: Primary Succession on Krakatau, Indonesia Part 2: Secondary Succession Case Study: Secondary succession in the Broadbalk Wilderness, Rothamsted, UK Part 3: Pioneer Vs Climax Communities Part 4: Summary of Changes Changes Over Time During Succession Succession is the natural process of change in the species composition and…

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  • ESS 2.5.1 Zonation and Succession

    Learning Objectives Zonation “Zonation describes the variation in biological communities along an environmental gradient” On rocky shores, distinct zones extend from the lower to the upper shore, each characterised by specific plant and animal distributions. Example: Seaweeds, in particular, exhibit clear zonation patterns Using Transect to Investigate Zonation Succession Ecosystems are dynamic systems that undergo…

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  • ESS 2.4.3 [AHL] Natural Phenomena Affecting the Ecosystem

    ESS 2.4.3 [AHL] Natural Phenomena Affecting the Ecosystem

    Learning Objectives Ocean Current The ocean conveyor belt, also known as the global thermohaline circulation, represents a large-scale system of ocean currents responsible for the movement of vast quantities of upper-ocean water and the transfer of energy through deep-sea circulation. This process is primarily driven by the formation and subsequent sinking of cold, saline water…

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  • ESS 2.4.2 Shifting Biomes

    ESS 2.4.2 Shifting Biomes

    Learning Objectives Global warming is leading to shifts in biomes The distribution of biomes is influenced by factors such as temperature, sunlight, and precipitation. An increase in CO2 and other greenhouse gases raises the average global temperature (Topic 6), which subsequently impacts rainfall patterns. These climatic changes, in turn, affect the distribution of biomes. Studying…

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  • ESS 2.4.1 Climate and Biomes

    Learning Objectives Part 1: Climate vs Weather Distinguishing Climate and Weather Part 2: Distribution of Biomes Biomes Tropical Rainforests Tropical rainforests experience constant high temperatures (around 26°C) and heavy rainfall (over 2500 mm per year), creating ideal conditions for plant growth. Found near the equator between the Tropics of Cancer and Capricorn (23.5° N and…

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  • ESS 2.3.2 [AHL] Nitrogen Cycle

    ESS 2.3.2 [AHL] Nitrogen Cycle

    Learning Objectives Part 1: Where can you find nitrogen? Part 2: Nitrogen cycles Part 3: The Haber Process Outline of the Haber Process The Haber process is an industrial method used to produce ammonia (NH₃) from nitrogen and hydrogen gases. It is essential for manufacturing fertilisers and other nitrogen-based chemicals. Raw Materials Reaction Conditions Chemical…

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  • ESS 2.3.1 Carbon Cycle

    ESS 2.3.1 Carbon Cycle

    Learning Objectives Part 1: Introduction to Biogeochemical Cycles The cycling of nutrients is essential in the maintenance of ecosystems because nutrients provide the chemical elements needed for biological molecules.  The factors influencing nutrient storage and transfer include: Part 2: Carbon Cycle Activity 1 Part 3: Carbon Storage Carbon sequestration Carbon sequestration is the natural capture…

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  • ESS 2.2.5 [AHL] Ecological Yields & Efficiency

    ESS 2.2.5 [AHL] Ecological Yields & Efficiency

    Learning Objectives Part 1: Maximum Sustainable Yield (MSY) Annual sustainable yield  Question: Explain why sustainable yields are higher for lower trophic levels Answer: Sustainable Yield and Trophic Level Efficiency in Food Production Sustainable yield (SY) is a measure of the rate at which natural capital, or natural income, increases and can be utilized without depleting…

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  • ESS 2.2.4 [AHL] Nutritional Roles of Organisms

    ESS 2.2.4 [AHL] Nutritional Roles of Organisms

    Learning Objectives Part 1: Autotrophs VS Heterotrophs All living organisms can be classified as autotrophs or heterotrophs. Autotrophs Heterotrophs Part 2: Ecological Productivity Productivity in ecosystems Notes

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  • ESS 2.2.3 Bioaccumulation and Biomagnification

    ESS 2.2.3 Bioaccumulation and Biomagnification

    Learning Objectives Part 1: Bioaccumulation and Biomagnification Part 2: [Case study] DDT Introduction of DDT Banning History of DDT Part 3: Microplastics

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  • ESS 2.2.2 Food Chains and Pyramids

    ESS 2.2.2 Food Chains and Pyramids

    Learning Objectives Part 1: Food Chains and Food Web A trophic level is a stage of position of a organism in a food chain. From the above example, the organisms can be placed into these trophic levels: Trophic level 1 = grass Trophic level 2 = grasshopper Trophic level 3 = toad Trophic level 4…

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  • ESS 2.2.1 Energy in the Ecosystems

    ESS 2.2.1 Energy in the Ecosystems

    Learning Objectives Part 1: Roles of Organisms – Terminologies Activity 1: Download the following file. Cut the boxed and try to match the roles of organisms with its terminology. Alternative activity 1: Define the following roles of organisms with examples Part 2: Law of Thermodynamics Photosynthesis and Respiration Photosynthesis & Cellular Respiration in Ecosystems Equation…

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  • ESS 2.1.6 [AHL] Further Classification & Cladistics

    Learning objectives Life Cycles and Human Impacts on Species Life cycles vary considerably among species, reflecting differences in reproductive behaviour, lifespan, and ecological adaptations. Species can be broadly categorised based on their reproductive strategies and the degree of parental investment in offspring. Species Life Cycle Differences and Classification Species exhibit distinct life cycle patterns that…

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