2.41 explain how the structure of the leaf is adapted for gas exchange
Leaves are thin which allows gasses to diffuse quickly through them. In addition the stomata at the bottom of the leaf allow the diffusion of gasses in to the leaf- when a guard cell is shrunk gasses can enter the leaf.
Gaps in the spongy mesophyll layer act as the main gas exchange surface allowing oxygen and water out and absorbing carbon dioxide also the gaurd cells are turgid when the stomoata are open not flaccid
1) Leaves have a large surface area to allow more CO2 to enter 2) they are thin so gases have to travel less 3) stoma allow gases to enter and exit 4) air spaces in spongy mesophyll layer allow gases to diffuse throughout leaf, and increase surface area, while the cells increase surface area further and are moist so they speed up gas exchange 5) stoma are spread out over leaves, preventing build up of waste gases which would slow down gas exchange, and allowing more co2 to enter
You could also say the empty spaces that allow gases to exchange in and the large surface area.
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DeleteGaps in the spongy mesophyll layer act as the main gas exchange surface allowing oxygen and water out and absorbing carbon dioxide also the gaurd cells are turgid when the stomoata are open not flaccid
ReplyDelete1) Leaves have a large surface area to allow more CO2 to enter
ReplyDelete2) they are thin so gases have to travel less
3) stoma allow gases to enter and exit
4) air spaces in spongy mesophyll layer allow gases to diffuse throughout leaf, and increase surface area, while the cells increase surface area further and are moist so they speed up gas exchange
5) stoma are spread out over leaves, preventing build up of waste gases which would slow down gas exchange, and allowing more co2 to enter
you mean stomata, a stoma is something very different.
DeleteNo, stomata is the plural of stoma
DeleteNo, stomata is the plural of stoma
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ReplyDeletehttp://igcse-biology-notes.blogspot.hk/2017/06/241-explain-how-structure-of-leaf-is.html