3.5 Plant nutrition

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  • Created on: 11-05-19 21:17

Photosynthesis

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Photosynthesis is the process which turns light energy into chemial energy in plants

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Leaf adaptations

  • Leaves:
    • are broad - so they have large surface area for diffusion
  • are thin - so gases only have to travel a short distance
  • they have air spaces - letting gases move easily between cells
  • they have stomata:
    • letting the gases diffuse in and out of leaf
    • which close in the dark, stopping transpiration happening, so that the plant doesn't dry out
    • they close when water supply from the roots start to dry up - but it does stop the plants from photosynthesizing
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Ions required for plant growth

  • Nitrates
    • they contain nitrogen which is necessary to make amino acids and protein
    • they are needed for cell growth
    • a defficiency would cause a stunted growth and older leaves will turn yellow
  • Phosphates
    • contains phosphorus to make DNA and cell membrane
    • needed for respiration and growth too
    • a defficiency would cause poor root growth and older leaver to turn purple
  • Potassium
    • helps the enzymes needed for photosynthesis and respiration
    • a defficiency would cause poor flower and fruit growth and discoloured leaves
  • Magnesium
    • is significant because it is required to make chlorophyll 
    • a defficiency would cause yellow leaves
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