Studied by 4 people
Plant tissue
Carbs, proteins, lipids
Photosynthesis chemical equation
6CO2 + 6H20 —> C6H12O6 + 6O2
Why is sunlight needed in p/s?
Provides light energy that is then converted into chemical energy in bonds of glucose
Why is glucose produced in p/s?
Simple sugar used in respiration to release more energy.
Used to make cellulose cell walls.
How is glucose stored in plants?
Starch- insoluble
Sucrose- soluble and transported around plant (phloem)
Fructose- in fruits
Chlorophyll
Molecule that captures light energy from the sun, found in palisade mesophyll
4 leaf adaptations
Long and broad- large surface area to absorb light
Green- contains chlorophyll that captures light
Network of veins- carry water and other substances
Thin- allows diffusion
Layers of a leaf
Cuticle
Upper epidermis
Palisade mesophyll
Spongy mesophyll
Vein
Lower epidermis
Stomata and guard cells
Upper epidermis
Transparent layer for light to reach palisade cells
Thin waxy cuticle to reduce water evaporation and prevent disease
Palisade mesophyll
Main photosynthesis location
Tightly packed cells
Contains lots of chloroplasts
Spongy mesophyll
Loosely packed cells
Air spaces
Gas exchange
Stomata
Pores controlled by guard cells
Allow diffusion of gasses and water
Investigating the effect of light on gas exchange by a leaf
4 sealed boiling tubes containing large leaves and hydrogen carbonate indicator
1 tube in bright light, 1 in dark, 1 in muslin and 1 control
The more p/s, the more CO2, the darker (yellow-purple)
Testing leaf for starch
Remove leaf
Leave heat in boiling water to denature enzymes
Add boiling tube of ethanol in double boiler
Add leaf to remove all chlorophyll
Wash leaf in cold water
Add iodine solution
If starch present, turns black
Test for CO2
Soda lime absorbed carbon dioxide inside a bell jar
Factors that affect photosynthesis
Light intensity
Carbon dioxide
Temperature
Limiting factor
The factor that slows down the rate of p/s
Nitrate use
Making amino acids, proteins and chlorophyll
Stunted growth
Phosphate uses
Making DNA
Poor root growth and young leaves turn purple
Potassium uses
Needed for enzymes and respiration
Leaves turn yellow with dead spots
Magnesium
Part of chlorophyll molecule
Leaves turn yellow
Note 
Flashcard (50)