The Interdependence Among Living Organisms With the Environment

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    THE INTERDEPENDENCEAMONG LIVING ORGANISMS

    WITH THE ENVIRONMENT

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    THE IMPORTANCE OF THE INTERACTION BETWEEN ORGANISMS

    AND THE ENVIRONMENT

    There are various types of biological interactions such as prey-predator,commensalism, mutualism, parasitism, and competition. There are manyreasons on why biological interaction is important.

    One of the importance of biological interaction is that it maintains the

    food web. A food web shows the food relationship among livingorganisms and most food webs start with green plants. An example of afood web is that of grass eaten by a grasshopper, a grasshopper eatenby a frog, a frog eaten by a snake and an owl. If biological interactiondoesnt exist, many animals would die from starvation as the food webwouldnt exist.

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    THE IMPORTANCE OF THE INTERACTION BETWEEN ORGANISMS

    AND THE ENVIRONMENT

    Another reason on why biological interaction is important is because

    it controls the population of living organisms. A predator is a livingorganism that hunts other living organisms for food and a prey is a livingorganism that is hunted by predators. For example, a lion is a predator

    and a zebra is its prey. The population of living organisms would beoverloaded if biological interaction didnt exist.

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    INTERACTION AMONG LIVING THINGS

    Why Organisms InteractOrganisms (including humans) interact with eachother all the time, whether we know it or not. Most

    of the interactions between species involve food: competing for the same food supply

    eating

    avoiding being eaten

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    INTERACTION AMONG LIVING THINGS

    (a) Prey-Predator . The animals that hunt other animals forfood are called predators, while the hunted animals

    are preys.(b) The predators which are carnivores have powerful

    jaws, sharp and strong teeth, goodstereoscopic vision, sharp claws or hard and strong

    beaks.(c) The preys have a wide field of monoscopic vision to

    detect predators or are able to camouflagewith their surroundings in order to escape from the

    predators.(d) The examples are tigers (predators) and horses (preys),

    eagles (predators) and rabbit (preys).

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    SYMBIOSIS:COMMENSALISM, PARASITISM AND MUTUALISM

    Symbiosis

    1. Insymbiosis, different organism live together in a closerelationship.

    2. In symbiosis, one organism always benefits by receiving food, aplace to stay and shelter. The other

    organism may benefit, be at a disadvantage or is not affected.

    3. There are three types of symbiotic relationship, i.e.commensalism. parasitism and mutualism.

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    SYMBIOSIS:COMMENSALISM, PARASITISM AND MUTUALISM

    Commensalism

    commensalism is a class of relationship between two organismswhere one organism benefits without affecting the other.

    Examples of animals that live on other animals to obtain food

    that fall out of the host's mouth, aswell as for shelter and transport are(a) remora fish that live on a shark

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    SYMBIOSIS:COMMENSALISM, PARASITISM AND MUTUALISM

    Parasitism

    Parasitismis another type of interaction between twoorganism. Only one organism benefits. The other organism isnegatively or adversely affected.

    A parasite is the organism that lives on or inside the otherorganism. The host is the organism on which the parasite lives.The host is negatively affected by this interaction. The parasitemay even kill the host.

    A parasite obtains food, shelter and transport from the host.For example, a tick that lives on a host feeds on the host'sblood.

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    SYMBIOSIS:COMMENSALISM, PARASITISM AND MUTUALISM

    MutualismMutualism is the way two organisms of different species exist

    in a relationship in which each individual benefits.

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    THE ADVANTAGES AND THE DISADVANTAGES OF BIOLOGICAL

    CONTROL IN AGRICULTURE

    Advantages1)free of side effects2)safe to handle or use3)occurs naturally

    4)survive of low host density

    Disadvantages1)control is slow2)it is often unpredictable

    3)slow to achieve results4)disruption of food chains

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    BRIEFLY THE IMPORTANCE OF PHOTOSYNTHESIS IN

    MAINTAINING A BALANCE ECOSYSTEM

    The Earth's atmosphere contains many different gases. Twogases that are of special importance to living organisms areoxygen and carbon dioxide. These two gases are used duringrespiration and photosynthesis. The atmosphere must have a

    proper balance of these gases to support life.

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