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Taha Science Isu

Taha Science Isu



A science project by Taha

A science project by Taha



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    Taha Science Isu Taha Science Isu Presentation Transcript

    • Unit 1-Sustainability of ecosystems Chapter 1 Pages 4-36
    • Instructions
      • Bolded words will represent keywords in our text book so please remember to pay special attention to them
      • Italic words will represent important words that are not considered keywords in the text book
    • Chapter 1.1 Capturing energy from the sun
    • Energy
      • All organisms use energy. Energy is the fuel of ecosystems.
      • Energy is transferred through food chains.
      • Energy isn’t created but instead is absorbed by plants.
      • If it wasn’t for plants this couldn’t have ever existed!
      • - Plants Produce energy
      • We are consumers and like most creatures we don’t make energy but instead we consume it as it moves up the food chain towards us
      • All of our activities;
      • even thinking require
      • energy. The same goes
      • for other organisms.
      • An Ecosystem is an
      • area were organisms
      • interact with each other
      • with their environment
      • of energy and matter
    • Food chains
      • Food chains are formed when organisms in
      • ecosystems interact ex. When herbivores
      • consume plants ( Producers ) the energy is
      • transferred from the plants to the herbivores
      • and when those herbivores are eaten by
      • carnivores the energy is transferred again, I
      • will elaborate on this topic later in this
      • presentation
    • Producers, Secondary consumers & Primary consumers
      • As mentioned earlier most producers are plants, although there are a few exceptions.
      • Primary consumers are animals like plant eaters (herbivores) who feed on the producers directly.
      • Secondary consumers are animals like foxes & wolves who feed on the primary consumers
    • Chapter 1.2 Feeding levels Pages 8-17
    • Comparing food chains
      • If you were to divide food chains into
      • different levels you would set producers on
      • one trophic level , Primary consumers would
      • make the next and Secondary consumers
      • would make the 3 rd .
      • Remember that some consumers may consume organisms from more than one trophic level.
    • How energy is used
      • Most of the energy consumed by trophic consumers is used just to stay alive, however organisms need energy to complete daily activities.
      • Useless energy is usually deposited as waste.
      • The amount of energy that is transferred from one trophic level to the next is 5-20%, this shows how much less energy there overall would be available for creatures higher on the food chain.
    • Pyramid of numbers
    • Pyramid of Biomass
    • Pyramid of energy flow
      • As explained earlier energy when transferred from one tropic to the next is overall reduced, and this is the purpose of the pyramid of energy flow, to show us a comparison of energy flow in ecosystems.
    • Chapter 1.3 Populations
    • Population
      • Changes in temperature, food, weather and other factors, especially human disruption all can have an effect on the population of certain species.
      • Two types of competition between species:
      • Intraspecific competition is competition among members of the same species
      • Interspecific competition is competition among different species
    • Density
      • Population density is a huge problem for many populations of animals.
      • Density dependant-factors increase in significance as a population grows.
      • Density independent-factors are very different. Instead these factors don't relate to the density of a population.
    • Chapter 1.4 Feeding people
    • Agriculture
      • Different areas have different properties that affect the productivity of those regions.
      • When we eat wheat we get energy directly from the plants however when eat meat we usually receive energy from a place much higher in the food chain, thus there is logically less energy available for humans this way.
    • Quick Key terms review
      • Ecosystem
      • Producers
      • Primary consumers
      • Secondary consumers
      • Tropic levels
      • Detritivores
      • Decomposers
      • Pyramid of numbers
      • Biomass
      • Pyramid of Biomass
      • Pyramid of energy flow
      • Carrying capacity
      • Competition
      • Intraspecific competition
      • Interspecific competition
      • Population density
      • Density-dependant factors
      • Density-independent factors
      • Productivity
      • Biological magnification
    • Questions
      • What are the differences between the pyramid of numbers and the pyramid of biomass?, explain with a example.
      • What are the differences between inter and intra specific competition?
    • The END BY: Taha Only 32 more slides! Just kidding