The word âexpediteâ simply means âto perform quicklyâ. The word itself is derived from Latin. The prefix âexâ (meaning âoutâ) and the word âpedâ (meaning âfootâ) originally came together in âexpedireâ (âfreeing the footâ), though soon afterwards someone swanned in with a âtâ and it became âexpediteâ.
The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf. Cross section of a leaf, showing the anatomical features important to the study of photosynthesis: stoma, guard cell, mesophyll cells, and vein. Image from Purves et al., , 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission.
All green parts of a plant contain chloroplastsâthe chloroplasts, or more specifically, the chlorophyll in them are what make the photosynthetic parts of a plant green. The plant cells which contain chloroplasts are usually parenchyma cells, though chloroplasts can also be found in collenchyma tissue. A plant cell which contains chloroplasts is known as a chlorenchyma cell.