Life Processes

  • Question 93

    Define breathing.

    The mechanism by which organism inhale oxygen prsent in the environment and exhale carbon dioxide is called breathing.
    Question 94

    How is respiration different from breathing?




    1. It is a mechanical process.

    1. It is a bio-chemical process.

    2. It occurs only in some animals which possess breathing organs like trachea, gills and lungs.

    2. It occurs in all animals and plants cells in the mitochondria.

    3. During breathing atmospheric air is taken into the body to obtain O2 and the CO2 is given out of the body.

    3. In the process of respiration the food (mainly glucose) is oxidised in the cells producing CO2, water and energy.

    Question 95

    In which kind of respiration more energy is released?

    In aerobic respiration more energy (686 kcal) is released than anaerobic respiration (58 kcal).
    Question 96

    What is the full form of ATP? How is it form? How much energy it releases when broken down? What are its uses?


    ATP stands for Adenosine triphosphate.

    Formation of ATP: The energy released during respiration process is used to make an ATP molecule from ADP (adenosine diphosphate) and inorganic phosphate (P).

    When the terminal phosphate linkage in ATP is broken using water, the energy equivalent to 30.5 kJ/mol is released.

    Uses of ATP: ATP is the energy currency for most cellular processes. ATP is used to supply energy in the cells for the functions such as contraction of muscles, protein synthesis, conduction of nervous impulse etc.

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