This revision note follows the latest syllabus of GCSE and IGCSE Biology and covers all details and knowledge needed to understand Plants Nutrition with concise wording and pictures.
Process by which plants produce carbohydrates from raw materials using light energy
B. WORD EQUATION & BALANCED CHEMICAL SYMBOL EQUATION
light
carbon dioxide + water glucose + oxygen
chlorophyll
light
6CO2 + 6H2O C6H12O6 + 6O2
chlorophyll
• Chlorophyll absorbs light energy and converts it into chemical energy for the production of
carbohydrates, such as glucose.
C. USING HYDROGENCARBONATE INDICATOR SOLUTION IN EXPERIMENTS
• This indicator is orange but changes colour, depending on the concentration of CO2.
Turns PURPLE at Turns YELLOW at
IN LIGHT IN DARK
LOW CO2 HIGH CO2
concentrations concentrations
ORANGE
hydrogencarbonate
Rate of photosynthesis is indicator solution Rate of respiration is
higher than rate of respiration higher than rate of photosynthesis
so CO2 level DECREASES so CO2 level INCREASES
= LOW CO2 = HIGH CO2
, D. THE FATE OF CARBOHYDRATES PRODUCED
• Glucose can be used in respiration or converted to other substances, which have different
roles in plants.
Glucose is
used in
respiration to
release
energy
Some can be Cellulose is
used to make used to
fats, amino strengthen
acids and plant cell
chlorophyll walls
USES
Sucrose is
Starch is a
used as a
storage
transport
carbohydrate
carbohydrate
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