Photosynthesis Flashcards
Photosynthesis equation
6CO(2) + 6H(2)O -> C(6)H(12)O(6) + 60(2)
Adaptations of the leaf
Supported by a stem and petiole to
To expose as much of it as possible to sunlight and air
Adaptations of the leaf
Large surface area to
Expose as much of it as possible to sunlight and air
Adaptations of the leaf
Thin to
Allow sulk that to penetrate to all cells; to allow CO2 and O2 to diffuse in and out as quickly as possible
Adaptations of the leaf
Stomata in lower epidermis to
Allow CO2 and O2 to diffuse in and out in the shade
Adaptations of the leaf
Air spaces in spongy mesophyll to
To allow CO2 and O2 to diffuse to and from all cells
Adaptations of the leaf
No chloroplasts in epidermis to
To allow sunlight to penetrate to mesophyll layer
Adaptations of the leaf
Chloroplasts containing chlorophyll present in mesophyll layer to
Absorb sunlight to provide energy for photosynthesis
Adaptations of the leaf
Palisade cells arranged end on to
Keep as few cells as possible between sunlight and chloroplasts
Adaptations of the leaf
Chloroplasts in palisade cells arranged broadside on, especially in dim light to
Expose as much chlorophyll as possible to sunlight
Adaptations of the leaf
Chlorophyll arranged on flat membranes inside chloroplast
To expose as much chlorophyll as possible to sunlight
Adaptations of the leaf
Xylem vessels within short distance of every mesophyll cell to
Supply water to chloroplasts for photosynthesis
Adaptations of the leaf
Phloem tubes within short distance of every mesophyll cell to
Take away organic products of photosynthesis
Where does most photosynthesis take place and why?
Palisade layer because it has most chloroplasts, most sunlight and is biggest
Photosynthesis word equation
Carbon dioxide + water -> oxygen + glucose
Do we test for starch or glucose in leaves?
Starch
Why do we test for starch in plants instead of glucose?
Glucose is small and soluble and gets used up in respiration
Why don’t we test for oxygen in the plant?
Too hard to collect
Is there more stomata in the upper or lower epidermis?
Lower
Why are there more stomata in the lower epidermis?
Not in direct sunlight, so gas doesn’t diffuse too fast
What adaptation would a plant in arid conditions have regarding stomata?
Less stomata to prevent water loss
What is light intensity measured in?
Lux
What is concentration measured in?
PPM (parts per million)
What is temperature measured in?
°C
What is light intensity measured in?
Lux
What is concentration measured in?
PPM (parts per million)
What is temperature measured in?
°C
What do guard cells do?
Control opening and closing if stomata
What does stomata do?
Let’s gases in and out
What do chloroplasts do?
Absorb light for photosynthesis
What does the waxy cuticle do?
Waterproof layer to stop leaf fro, drying up
What is the purpose of spongy mesophyll?
Allows gases to circulate
What is the purpose of the palisade layer?
Chloroplasts absorb light
Photosynthesis word equation
Carbon dioxide + water -> glucose + oxygen
Are there more stomata in the upper or lower epidermis?
Lower
Why are there more stomata in the lower epidermis?
Not in direct sunlight, prevents water loss
What is the inverse square law?
I = 1/d(^2)
