gas exchange in the leaf Flashcards
What does CO2 do in sunlight?
In sunlight carbon dioxide diffuses from the atmosphere into leaves through the stomata located on the lower surface of the leaf.
What is the function of stomata?
The function of the stomata is gas exchange.
What do large numbers of stomata do for the rate of gas exchange in a leaf?
The large numbers of stomata increase the rate of gas exchange (by increasing the surface area).
What does CO2 do once inside a leaf?
Once inside the leaf, carbon dioxide diffuses to the ground tissue through the air spaces between these cells.
What do the air spaces in a leaf do for the internal surface area?
The air spaces increase the internal surface area of the leaf.
What does the increased surface area in a leaf and on a leaf allow for more of?
The increased surface area allows carbon dioxide to diffuse more readily into the ground tissue cells.
Describe the trip oxygen takes to leave a leaf
Oxygen diffuses from the ground tissue, into the air spaces and out of the leaf through the stomata.
What does water vapour diffuse out of from a leaf?
Water vapour also diffuses out of the leaf through the stomata.
Define transpiration
The loss of water vapour from a plant is called transpiration.
what is each stoma enclosed by?
Each stoma is enclosed by a pair of guard cells
What do guard cells do?
The guard cells can open or close the stoma.
When are stomata open and closed?
stomata are open by day (to allow gas exchange for photosynthesis) and closed at night (to reduce water loss).
