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    How Species Interact Energy Flow and Enrgy Cycle

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    BRIGHTON ONYANGO
    This document provides an overview of a lesson on how species interact in an ecosystem. It includes key concepts like relationships, biotic and abiotic factors, energy flow, and trophic levels. The lesson objectives are to have students develop a food web from their local ecosystem and analyze the efficiency of energy transfer across trophic levels. Tasks involve identifying biotic interactions in examples and describing how organisms are adapted to their ecosystem. Assessment criteria cover topics like producers and consumers, food chains and webs, effects of changes on populations, and examples of predation, competition, and symbiosis.

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    How Species Interact Energy Flow and Enrgy Cycle

    Uploaded by

    BRIGHTON ONYANGO
    9 views16 pages
    This document provides an overview of a lesson on how species interact in an ecosystem. It includes key concepts like relationships, biotic and abiotic factors, energy flow, and trophic levels. The lesson objectives are to have students develop a food web from their local ecosystem and analyze the efficiency of energy transfer across trophic levels. Tasks involve identifying biotic interactions in examples and describing how organisms are adapted to their ecosystem. Assessment criteria cover topics like producers and consumers, food chains and webs, effects of changes on populations, and examples of predation, competition, and symbiosis.

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    How Species Interact; Energy Flow and Enrgy Cycle

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    This document provides an overview of a lesson on how species interact in an ecosystem. It includes key concepts like relationships, biotic and abiotic factors, energy flow, and trophic levels. The lesson objectives are to have students develop a food web from their local ecosystem and analyze the efficiency of energy transfer across trophic levels. Tasks involve identifying biotic interactions in examples and describing how organisms are adapted to their ecosystem. Assessment criteria cover topics like producers and consumers, food chains and webs, effects of changes on populations, and examples of predation, competition, and symbiosis.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    9 views16 pages

    How Species Interact Energy Flow and Enrgy Cycle

    Uploaded by

    BRIGHTON ONYANGO
    This document provides an overview of a lesson on how species interact in an ecosystem. It includes key concepts like relationships, biotic and abiotic factors, energy flow, and trophic levels. The lesson objectives are to have students develop a food web from their local ecosystem and analyze the efficiency of energy transfer across trophic levels. Tasks involve identifying biotic interactions in examples and describing how organisms are adapted to their ecosystem. Assessment criteria cover topics like producers and consumers, food chains and webs, effects of changes on populations, and examples of predation, competition, and symbiosis.

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    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 16

    Unit 4: HOW DO SPECIES INTERACT?

    Key Concept of focus: RELATIONSHIP


    Related concepts: Environment, Consequences

    Key terms and phrases;


    - Ecosystem - Biotic factor,
    - Energy flow, - Abiotic factor
    - Trophic level,

    Lesson Outcomes;
    1. Develop own food web from immediate ecosystem and demonstrate the flow of energy.
    2. Interpret the efficiency of energy transfer across successful trophic levels
    Task:
    1. Organisms of different species can interact in many ways. With examples
    from the following photographs (next slide) identify/describe at least 3 ways in
    which living organisms in the environment can relate to each other.
    2. What is the source of energy for the organisms in the ecosystem?
    3. How does the energy flow across the different levels of organisms?
    Modes of nutrition?

    Modes of feeding?
    Check list;

    Autotrophs (or producers) make their own food using light or chemical energy.
    Examples;

    Heterotrophs (or consumers) get organic molecules by eating other organisms or their by-
    products.
    Examples;

    Food chain - A series of organisms in which energy is transferred from one level to another
    Food web - A network of feeding interactions, usually consisting of multiple food chains
    Trophic level (Feeding level) - Each step in a food chain or food web
    From the clip;
    (a)i. Name the source of energy for the organisms in
    the clip
    ii. Using a possible food chain, describe the flow
    of energy in the ecosystem.
    (b)(b) i. Name two biotic interactions witnessed in
    the clip.
    ii. How are the organisms in any of the interactions
    identified adapted to survive in the
    ecosystem?
    a) Identify the relationship represented.

    b) Isolate and write down 3 food chains.

    c) From the illustration identify the secondary

    consumers

    d) Show the consequence of prolonged drought on

    the population of snakes.


    1. Using the food web above, Identify (4 marks)
    A producer
    An omnivore
    A primary consumer

    2 secondary consumers

    2. State what arrows in the model represent. (1 mark).

    3. Humans built a large housing development in the forest which is the habitat of the foxes. The foxes now
    use human trash as a source of food.
    Outline how the population of foxes could be affected by this change. (2 marks)
    Describe how the deer population would then be affected. (3 marks)
    Explain how the oak tree and rabbit populations might change if the squirrel population
    decreases. (5 marks)

    Describe how the rabbit population might change if the squirrel population decreases. (3
    marks)

    With examples from the above model, explain the following types of natural interactions.
    Predation
    Competition
    Symbiosis
    Take away

    Energy transfer from one trophic level to the next is not 100% efficient.

    (a)Using a table, represent an example of energy transfer across trophic

    levels.

    (b)Account for the trend in amount of energy from at each trophic level
    How do elements essential for life cycle between the environment and organisms? Page 161-164
    https://
    ib.bioninja.com.au/options/option-c-ecology-and-conser/c6-nitrogen-and-phosphorus/nitrogen-cycle.html#previous
    -photo
    https://www.liveworksheets.com/worksheets/en/Science/Ecosystems/Nitrogen_Cycle_nr1628392xs
    https://ib.bioninja.com.au/standard-level/topic-4-ecology/43-carbon-cycling/carbon-cycle.html#previous-photo

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