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Where do we get our energy from?
How do we release energy from food?
Food + Carbon dioxide +Oxygen + ENERGYWater
Respiration
(Glucose)
PhotosynthesisIn order to get energy plants must make
their own food.
The do this by the process of photosynthesis.
In light plants can photosynthesise and respire. In dark plants can only respire.
Food + Carbon dioxide +Oxygen + ENERGYWater(Glucose)
Respiration
+ FoodCarbon dioxide + OxygenWater Sunlight(Glucose)
Photosynthesis
Algae Bead InvestigationIn a small beaker (mix together):• 2.5cm3 sodium alginate• 5cm3 algal cells
Then,• Put some calcium chloride in another
beaker• Position calcium chloride under an
open-ended syringe• Pour algal mixture into syringe• Rinse the algal balls with distilled water
Algae Bead Investigation1. Collect:
• Algae beads
• 7 mini jars
• spatula / spoon
• One of each type of filter
2. In each mini jar add 15 algae beads
3. Add bicarbonate indicator to each mini jar
4. Slot a filter onto each mini jar
5. Place mini jars in light bank or on window ledge
Step 3
Slide a different light filter on each tube, leave 1 with nothing on... Clearly label your tubes!
There is a top and bottom to the filters.
Photosynthesis
Increasing CO2 in indicator
Decreasing CO2 in indicator
Less Photosynthesis took place
More Photosynthesis took place
What do your results tell you?
What effect does light intensity have on photosynthesis?
Each filter lets through a different amount of light.
In other words we are changing the light intensity reaching the algae.
100% 71% 50% 25% 12.5% 6.3% 0%
What does more CO2 tell us about the rate of photosynthesis?
DayPlants photosynthesise
and respire
Oxygen Carbon dioxide
Carbon dioxideOxygen
Respiration
Photosynthesis
What does more CO2 tell us about the rate of photosynthesis?
NightPlants only respire
Oxygen Carbon dioxide
Respiration
Song:http://www.youtube.com/watch?v=C1_uez5WX1o
Photosynthesis:http://www.bbc.co.uk/scotland/learning/bitesize/standard/biology/world_of_plants/making_food_rev4.shtml