Weekly Article On Photosynthesis

1606 Words Nov 30th, 2014 7 Pages
Weekly Summary on Photosynthesis
Structure of the Chloroplast: Leafs contain chlorophyll and are the sites of photosynthesis in plants. Their flattened surfaces gather energy from sunlight while openings on their undersides bring in carbon dioxide and release oxygen. The cells of a leaf are pack in between two layers of epidermal cells, which provide the leaf with a waxy, almost impermeable cuticle that defends against water loss. The only way for gases to diffuse in and out of the leaf is through small openings on the underside of the leaf, the stomata then open and close according to the plant 's needs. The tissues of the leaf in between the epidermal cells, in which gases diffuse from the stomata, are called mesophyll. Chloroplasts are the sites of photosynthesis. These double-membrane bound organelles surround extra membranes called thylakoids. The disc-shaped thylakoids possess an interior space and are stacked to form grana, which are suspended in the stroma of the chloroplasts
Light reaction vs. Calvin Cycle: These two stages of photosynthesis are known as the light reactions and the Calvin cycle. The light reactions are the steps of photosynthesis that convert solar energy to chemical energy. Light absorbed by chlorophyll drives a transfer of electrons and hydrogen from water to an acceptor called nicotin-amide adenine dinucleotide phosphate, which briefly stores the energized electrons. Water is then split in the process, and so it is the light reactions of…
Open Document