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Uses of GLUCOSE

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					Uses of GLUCOSE

 Lesson No. 2
            za I-3
How much glucose does a
plant make?
  Plants make enough glucose to be used
   during the night and on cloudy days
   when they don’t get sunlight.
What happens to glucose ?

   All plant cells need ENERGY.
   Some of the glucose will be broken down
    to release energy in a process called
    RESPIRATION.
Overview of photosynthesis and respiration
  SUN




          RADIANT
          ENERGY


PHOTOSYNTHESIS         RESPIRATION             CELL
                                             ACTIVITIES


            GLUCOSE              ATP(ENERGY)
 EQUATION   FOR
 RESPIRATION

                   CARBON
GLUCOSE            DIOXIDE           ATP
C6H12O6 + 6O2      6CO2 + 6H2O + ENERGY
          OXYGEN             WATER
RESPIRATION    ATP(ENERGY)

                                   CELL
                                 ACTIVITIES



              1. growth
              2. cell division
              3. movements
              4. transport
 Glucose may be turned into STARCH
  and stored into leaf.
Why starch ?

  Glucose is 1. soluble in water and
                2. very reactive
  STARCH – big molecule made of many
   glucose molecules
   - not very reactive
   - not very soluble
Starch granules
inside plant cells.
( chloroplasts, root
hair cells…)
 Glucose can be changed to SUCROSE
  for transport to the other parts of the
  plant.
 SUCROSE is transported by the
  PHLOEM vessels to different plant parts.
  ( fruits, roots, shoots…)
Sucrose can be :


  1. turned back into glucose
  2. broken for energy
  3. turned into starch
  4. used to make other substances for
     growth
Glucose may be used

 TO MAKE OTHER
 ORGANIC
 SUBSTANCES.
          ( glucose)

 fatty acids       glycerol




combine to form fats and oils
(to form cell membranes and as
a food store)
glucose
                           mineral salts
                        (e.g. NO3-, SO42-)

          amino acids




   join together to become
   protein molecules
 In the air there is 78 % of NITROGEN,
  but it is useless. ( unreactive )
 So plants absorb NITRATE IONS from
  the soil by diffusion and active transport.
 Nitrate ions combine with glucose to
  make AMINO ACIDS, which are then
  strung together to form PROTEINS.
glucose
                       mineral salts
                    (e.g. NO3-, SO42-)

  CHLOROPHYLL
                    MAGNESIUM
                     MAGNESIUM




   join together to become
   CHLOROPHYLL
 For making the CHLOROPHYLL plants
  need glucose, nitrogen and
  MAGNESIUM.
 They get magnesium ions from the soil,
  like nitrate ions.
         Summary :

 GLUCOSE IS USED FOR :
1.   Energy
2.   Turned into STARCH
3.   Changed into SUCROSE
4.   To make other organic substances
     ( fats and oils, proteins and chlorophyll )

				
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posted:8/12/2012
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