How do plants get their food?

6 Answers

  • 1 decade ago
    Favorite Answer

    Photosynthesis is by which light energy is absorbed by the chlorophyll which contains chloroplast that is used for the synthesis of carbohydrates in water and carbon dioxide with oxygen being given off in the process. The conditions needed are water, CO2, H2O, chlorophyll,temperature. There are two stages of photosynthesis-the light dependent stage and the light independent stage. Lets start with the light dependent stage.

    First, light energy is being absorbed by the chloroplast in the chlorophyll which is converted into chemical energy. Secondly, Photolysis of water occurs, which break down the water molecules to oxygen and hydrogen. The oxygen is given off.

    The light independent stage

    First, Carbon dioxide is taken in by the plants. Secondly, the carbon dioxide that is taken in is being reduced by the hydrogen that is from the photolysis of water in the light dependent stage to form glucose with the help of chemical energy.

    The word equation for photosynthesis is

    Carbon dioxide + water -> Oxygen + Glucose

    Chemical eqn: 6CO2 + 12H2O->C6H12O6+6O2+6H2O

    Blue and red lights are the most effective for photosynthesis.

    Light intensity, temperature and carbon dioxide concentration are the limiting factors of photosynthesis.

    The higher the light intesity/temperature/carbon dioxide concentration, the higher the rate of photosynthesis.

    However, for light intensity and carbon dioxide concentration, the is a saturation point to it. As for temperature, at low tempt., enzymes are inactive, thus rate of photosynthesis occurs alowly. As tempt. increase, it gets more active and rate of photosynthesis increase. At 40 degree, enzymes are the most active as it is the optimum temperature and rate of photosynthesis is at ts maximum. As temperature continues to rise, enzymes starts to denature and rate of photosynthesis slows down or even stops.

    Entry of carbon dioxide to leaf

    1) Photosynthesis occurs -> 2) CO2 in leaf used up rapidly-> 3) diffusion gradient occurs-> 4) CO2 diffuse onto the leaf->CO2 dissolves into water mesophyll cells and othe cells.-> back to 1).


    1) petiole- Holds leaf in positions to expose leaf to as much sunlight and air as possible.

    2)large surface area- To absrb maximum sunlight

    3) Thin lamina-To allow sunlight to penetrate through all cells and also CO2 to diffuse in rapidly.

    4)Stomata in epidermal layer- Allow CO2 and O2 to diffuse in and out

    5)Intellectual air spaces in mesophyll layers- To allow CO2 and O2 to diffues in and out rapidly.

    6)Xylem and phleom near mesophyll cells- To transport water for photosynthesis(xylem) -To transport sugars away from leaf(phleom)

    7)Chloroplast in mesophyll layers- To photosynthesis to take place

    8)More chloroplast in upper palisade tissue- More light energy can be absrbed at the leaf surface.

    Glucose in leaf

    1) Converts to starch at night and back to glucose at day

    2) Reacts with nitrates in soil to form amino acids to form proteins that is fr the formation of new protoplasm in leaves while excess amino acid are transported to other parts of the plants.

    3)Used in tissue respiration and cellulose cell wal

    4)Excess are converted to sucrose that is use to transport to storage organs.

    5)convert to fats for storage, cellular respiration and forming new protoplasm

    6)CO2 + H2O to form glucose

    Xylem and Phleom

    Functions: (phleom)Conducts sugars and amino acids form leaf to other parts of the process.

    : (xylem)Conducts water with dissolved mineral salts from roots to stem to leaves and providing mechanical support to the plant.Passive process.

    Transpiration pull

    The cells in the leaf are covered with a film of water which will diffuse through the stomata to the surrounding air. The loss of water from mesophyll cells will pull in water from neighbouring cells and this extends all the way to the top of the pant n a cntinuos column

    higher humidity, slower transpiration pull

    higher temperature, greater transpiration

    stronger wind, greater transpiration pull

    more light, greater transpiration pull


  • 1 decade ago

    Plants get their food by the process of photosynthesis during which the plants prepare their own food in presence of sunlight, carbon dioxide and water with the help of the pigment called chlorophyll. Glucose is produced during this reaction which is stored and used by the plants.

  • 1 decade ago

    Photosynthesis is how they feed themselves. (taking sunlight and converting it into 3-carbon sugars which can be synthesized into a number of things, including glucose)

    However, nutrients are also absorbed from the soil by the roots and transported up the phloem (vascular tissue) and to the rest of the plant.

    Nutrients naturally occur in soil, but many plants have a mutualistic relationship with fungi, which breaks down complex molecules into simpler molecules that plants can then use as food.

  • 1 decade ago


    Sunlight and Water and Carbon Dioxide into Glucose (sugar energy) and Oxygen

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  • Anonymous
    5 years ago

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  • Anonymous
    1 decade ago

    Photosynthesis >_>

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