What is the word and balanced symbol equation for photosynthesis?
Carbon dioxide + water => glucose + oxygen
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Where does the energy come from for photosynthesis? And what type of reaction is it?
Sunlight and endothermic
What happens to glucose in photosynthesis?
Converted to starch
What happens to oxygen in photosynthesis?
Diffuses into air
What is the function of chlorophyll?
Absorbs light
How is a leaf adapted to photosynthesis?
Large surface area to absorb light, thin for short diffusion pathway, stomata for gas exchange, extra chloroplasts in palisade layer for photosynthesis, xylem to carry water around plant
What is in a plant cell?
Cell wall, cell membrane, cytoplasm, nucleus, vacuole, chloroplast
What limits the rate at which photosynthesis occurs?
Chlorophyll, carbon dioxide, light, temperature
What do plants need to grow?
Light, carbon dioxide, water, chlorophyll
How do you test a leaf for starch
Play sleep in beaker with water and heat over Bunsen burner, once boiling put leaf in measuring cylinder with alcohol and put back in beaker, take take leaf out of alcohol and put ethanol on leaf to remove chlorophyll, drop iodine on leaf to test for starch, turns black or blue if present
Why is leaf arrangement important?
Helps ensure all plants get as much sunlight as possible, leaves aren’t overlapping so large surface area
What is a limiting factor?
A factor that when one increases the rate of photosynthesis when its value is increased
What is the effect of light intensity on photosynthesis?
At first as light intensity increases the rate of photosynthesis increases until it levels out. When there is more light the chloroplasts perform photosynthesis. Chlorophyll can only absorb so much at a time so levels off.
How does temperature affect rate of photosynthesis?
At first as temperature increases from 0°C the rate of photosynthesis increased until around 45°C where it rapidly decreased back to 0. Particles have more successful collisions until around 40°C where it then gets too hot and denatures
How does CO2 affect rate of photosynthesis?
At first as concentration of CO2 increases the rate of photosynthesis increases until its levels out. Plants need CO2 to function so the more there is the more it can be used for photosynthesis.
How does temperature increase reaction?
Particles have more kinetic energy so move more and there are more successful collisions
What is a propane burner and give advantage/disadvantage?
Works by burning fossil fuels and adds CO2 to air. A – rate of photosynthesis increased. D – cost of fuel.
What is a venting system and state advantage/disadvantage?
Let’s heat escape to avoid high temperatures. A – plants can be grown out of season. D – cost of installation.
What is a hydroponic growing system and give advantage/disadvantage?
Grace plants without soil so roots are bare. A – plants can be grown anywhere. D – expensive to install.
What is netting/blinds and given advantage/disadvantage?
Reduces strong sunlight in the summertime. A – plants can be grown all year round. D – dangerous near heaters.
What is an automatic watering system and state a advantage and disadvantage?
Water plants that points in the day. A – constant water supply. D – cost of installation.
What must you consider in exams in reference to enhancing photosynthesis?
Must consider profit for example which lighting will increase photosynthesis the most without increasing cost too much
What is osmosis?
The movement of water through a partially permeable membrane from an area of high water concentration to an area of low water concentration
What does crops stand for?
C - cellulose, R - respiration, O - oils and fats, P - proteins, S - starch
