Pores in the leaf surface that allow for gas exchange
Through the stomata, carbon dioxied enters the plant and oxygen and water vapor exit the plant
To conserve water under dry conditions, the stomata remain closed to reduce the loss of water vapor
Have double membrane. Stacked into Grana
Where photosyn. starts with absorption of sunlight. Thylokoid membranes contain a pigment -chlorophyll a and other accessory pigments aid it in a absorbing sunlight
Two stages of photosynthesis
1st stage: (light reactionsThe power of sunlight will 1.strip electrons off water and then 2. boost these electrons to a higher energy level. When boosted, the electrons are passed along through a series of the electron carriers. All of this takes place in thylokoid membranes. This stage ends when the original, energized electrons get attached to a mobile electron carrier - NADP+ that transport them to the second set of reactions.
2nd stage:(Celvin cycle) attachment of electrons to CO2 and sugar the carbon fixation, occur in stroma
in thylokoid membranes, molecules collect solar energy and converts to chemical energy.
Components are: chloropyll a -serve as antennae that absorb energy from sun and pass it on to the reaction center.
At the center of photosystem is a reaction center(have special chlorophil pigments) that first receive solar energy from photosys, pigment sna transofrm this solar energy into chem. This molecules are the "primary electron acceptors)