Respuesta :

leunnam
CO2 used during photosynthesis first must pass through stomata into internal spaces within the leaf. It then diffuses into mesophyll cells where it becomes available for photosynthesis. When the stomata close, CO2 levels drop rapidly within the leaf, inhibiting the light-independent reactions.
marianaegarciaperedo

Stomata are pores limited by two guard cells that control their opening-closure. Stomata are involved in CO₂ and O₂ interchange and limit water vapor flow when the plant is dehydrated, letting it available for  photosynthesis.

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Stomata are small pores placed in the leafs' surfaces, whose opening is regulated by two guard cells that are surrounding them.

These pores are involved in gas interchange -letting CO₂ get into the plant, and O₂ leave it- and transpiration process -expelling water through transpiration-.

Guard cells can expand or contract according to the plants' needs, causing the stomata opening or closure.

Stomata opening and closure depend on water and CO₂ concentration inside the plant.

  • If the plant is dehydrated, stomata close. If it is not dehydrated, it opens.

  • If CO₂ levels are too low, stomata open to gain it.

So, according to this information, stomata affect photosynthesis by controlling gas interchange -CO₂ and O₂- and water release -transpiration-.

Gas interchange:

  • Plants need CO₂ to photosynthesize.

  • Stomata allow this molecule to get into the plant while it is opened.

  • During light reactions, plants release O₂, and this molecule can leave the plant through stomata.

Water balance:

  • Stomata also regulate water vapor flow through transpiration.

  • By limiting its exit, stomata allow more water molecules to be available for light reaction processes when the plant is dehydrated.

So, the stomata affect the Light Reaction mainly by controlling gas interchange, but also by limiting water loss through transpiration.

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