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Plants and Food
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Plants and food exam notes for iGCSE
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PHOTOSYNTHESIS WORD EQUATION BALANCED EQUATION FOR PSsunlight sunlight
CO2 + H2O ————→ glucose + O2 6CO2 + 6H2O ————→ 6O2 + C6H12O6
chlorophyll chlorophyll
IMPORTANCE OF ITS PROCESS AND ITS CONVERSION OF LIGHT ENERGY TO CHEMICAL ENERGY
In PS in green plants, light is used to convert: H2O+ CO2 + minerals → O2 + energy-rich compounds.
PRACTICAL TO MEASURE ITS RATE USING POND WEED
METHOD
- set up apparatus as shown
- place lamp 10cm from pondweed
o
- lamp on; count n of bubbles produced in 1 min
- repeat with a lamp at diff. distance of pondweed
INDEPENDENT VARIABLE
- light intensity
HOW TO TEST A LEAF FOR STARCH HOW IT CAN BE USED TO SAY IF PS IS TAKING PLACE
-boil leaf to kill the leaf and stop PS Leaves have:
-add ethanol to take away the leaf color
green parts where the cells contain chlorophyll
-rinse leaf with warm water to remove extra
ethanol because it is flammable
white parts where there is no chlorophyll
This is evidence as chlorophyll is required for photosynthesis.
EXPLAIN WHAT LIMITING FACTORS IS HOW EACH AFFECT PS RATE
Any factor that slows down the rate of a process light if low → low photosynthesis
LAW: when a process depends on 2/+ factors, the rate is limited by the CO2 if more → more photosynthesis
factor which is shortest in supply.
temp too hot → ps rate ↓ or it can die
CARBOHYDRATES LIPIDS PROTEINS
CHEM. ELEMENTS carbon, oxygen, hydrogen carbon, oxygen, hydrogen C, oxygen, sulphur, nitrogen
HOW PLANTS USE GLUCOSE
Respiration, making fruits, cell walls, proteins, stored in seeds and stored in starch
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