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Biology: Nutrition and Energy Source
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Biology: Nutrition and Energy Source

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Questions and Answers

What is the process of acquiring oxygen from outside the body for cellular needs?

  • Metabolism
  • Photosynthesis
  • Respiration (correct)
  • Nutrition
  • What is the primary source of energy for organisms?

  • Environmental energy
  • Internal body mechanisms
  • Carbon-based molecules
  • Food sources from outside the body (correct)
  • Why do organisms need to break down food sources into a uniform source of energy?

  • To maintain cellular structure
  • To store energy for later use
  • To facilitate molecular movements (correct)
  • To eliminate waste products
  • What is the result of the body's inability to control its environment?

    <p>Energy sources are varied and unpredictable</p> Signup and view all the answers

    What is the relationship between the size of an organism and its nutritional needs?

    <p>Larger organisms require more nutrition</p> Signup and view all the answers

    What is the purpose of oxidation-reduction reactions in the body?

    <p>To break down molecules for energy</p> Signup and view all the answers

    Why do single-celled organisms not need specific organs for exchanging gases and removing waste?

    <p>Because they are in direct contact with the environment</p> Signup and view all the answers

    What is the result of chemical reactions that use carbon sources and oxygen for energy generation?

    <p>The creation of harmful by-products for the cells</p> Signup and view all the answers

    What is the main reason for the development of a transportation system in multi-cellular organisms?

    <p>To provide oxygen and nutrients to all parts of the body</p> Signup and view all the answers

    What is the process by which waste by-products are removed from the body and discarded outside?

    <p>Excretion</p> Signup and view all the answers

    Why do all the cells in a multi-cellular organism not receive the necessary nutrients and oxygen through simple diffusion?

    <p>Because the cells are not in direct contact with the environment</p> Signup and view all the answers

    What is the main difference between single-celled and multi-cellular organisms in terms of their body design?

    <p>Multi-cellular organisms have a more complex body design</p> Signup and view all the answers

    Study Notes

    Energy and Nutrition

    • Energy comes from outside the body of an individual organism through food, which is a carbon-based source.
    • Nutrition is the process of transferring energy from outside the body to the inside.

    Growth and Development

    • For an organism to grow, additional raw materials are needed from outside the body.
    • The complexity of an organism determines the type of nutritional process it uses.

    Energy Sources

    • The outside sources of energy are varied and come from the environment.
    • Energy sources need to be broken down in the body and converted to a uniform source of energy for molecular movements.

    Chemical Reactions

    • Oxidising-reducing reactions are used to break down molecules.
    • Many organisms use oxygen sourced from outside the body for these reactions.

    Respiration

    • Respiration is the process of acquiring oxygen from outside the body to break down food sources for cellular needs.

    Simple and Complex Organisms

    • In single-celled organisms, the entire surface is in contact with the environment, so no specific organs are needed for taking in food, exchanging gases, or removing waste.
    • In multi-cellular organisms, not all cells are in direct contact with the environment, so specialized tissues are needed for these functions.

    Specialized Tissues

    • Specialized tissues are responsible for the uptake of food and oxygen.
    • These tissues are organized in the body to perform specific functions.

    Transportation System

    • A transportation system is needed to carry food and oxygen from one place to another in the body.
    • This system is necessary because food and oxygen are taken up at one place in the body, but all parts of the body need them.

    Excretion

    • Chemical reactions create by-products that are useless and potentially harmful to the body.
    • Excretion is the process of removing these waste by-products from the body and discarding them outside.

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    Description

    Learn about the process of nutrition and how organisms obtain energy from outside sources. Understand the importance of carbon-based molecules in food and how they relate to the growth of an organism.

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