T6 Flashcards
Where dose photosynthesis occur
Inside the chloroplast, contain chlorophyll which absorbs light
What is the equation for photosynthesis
Carbon dioxide+water-> glucose+oxygen
What is the balanced symbol equation for photosynthesis
6CO,2 + 6H,2,O -> C,6H,12O,6+ 6O,2
Is photosynthesis endothermic or exothermic
Endothermic, energy is taken in
What 3 factors affect photosynthesis
1) light intensity
2) concentration of carbon dioxide
3) temperature
Why is temperature a limiting factor
To hot- enzymes denature
To cold- enzymes will work to slowly
What is transpiration
Happens on the surface of leaves
Caused by evaporation + diffusion
The loss of water causes slight shortage of water -> causing xylem vessels to bring water up and replace it
What is the role of root hair cells
Cells of the surface of plant roots which stick into the soil
There have millions of tiny hairs giving the plant a large surface area for absorbing ions
What dose the phloem do
Phloem tubes transported food
There made of columns of elongated living cells with small pores in the end of the walls to allow stuff to flow through
Transport sucrose made in the leaves to the rest of the plant
This process is called translocation
Transport goes in both directions
What dose the xylem do
Xylem tubes take water up
Here made of dead cells joined end to end with no end walls between them, and a hole down the middle
There strengthened with a material called lignin
They carry water and mineral ions from the roots to the stems/leavez
Called the transpiration stream
What are environmental factors that affect transpiration
1) light intensity , brighter the light the greater the rate of transpiration
2) temperature, water it is faster rate of transpiration
3) air flow, greater wind greater transpiration
What is the stomata
Tiny pores on the surface of plants
They allow O2 and CO2 to diffuse directly in and out of the leaf
Allows water vapour to escape through transpiration
What surrounds the stomata
Guard cells
What do the guard cells do
When the guard cells are turgid (swollen with h2o) the stomata is open to allow transpiration
When the guard cells are flaccid (low on water) the stomata is closed (usually when it’s dark)
