Food chain (80)

Food chain since multicellular animals began

-How do you define the key term/words/concepts?

-How can these events be presented by a time line ?

-Discuss the geographical locations of them how could you present these locations

-What were the life forms during these periods?what were their feature?

-What impact did these events have on the life forms?

-If these life form carried on on to develop how did they manage to do it ? why do you think they could do so?

1 Answer

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  • 1 decade ago
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    Food chains and food webs are representations of the predator-prey relationship

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    between species within an ecosystem or habitat.

    Organisms represented in food chains

    In nearly all food chains, solar energy is input into the system as light and heat, utilized by autotrophs (i.e., producers) in a process called photosynthesis. Carbon dioxide is reduced (gains electrons) by being combined with water (a source of hydrogen atoms), producing glucose.

    Pyramid

    In a pyramid of numbers, the number of consumers at each level decreases significantly, so that a single top consumer, (e.g., a polar bear or a human), will be supported by a million separate producers.

    There is usually a maximum of four or five links in a food chain, although food chains in aquatic ecosystems are frequently longer than those on land. Eventually, all the energy in a food chain is lost as heat

    Entropic losses in the chain

    It is often the case that the biomass of each trophic level decreases from the base of the chain to the top. This is because energy is lost to the environment with each transfer as entropy increases. About eighty to ninety percent of the energy is expended for the organism’s life processes or is lost as heat or waste. Only about ten to twenty percent of the organism’s energy is generally passed to the next organism.[13] The amount can be less than one percent in animals consuming less digestible plants, and it can be as high as forty percent in zooplankton consuming phytoplankton.

    Source(s): YAHOO
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