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.
Functions of the leaf. Chloroplasts chloroplast: Microscopic structure containing chlorophyl found in green plant cells where photosynthesis takes place. are the tiny structures in plant cells where photosynthesis happens.Chloroplasts contain chlorophyll chlorophyll: The green chemical inside the chloroplasts of plant cells.It enables photosynthesis to take place. , a green pigment that absorbs light energy for photosynthesis. However, chloroplasts are not found in all plant cells.hloroplasts contain chlorophyll chlorophyll: The green chemical inside the chloroplasts of plant cells. It enables photosynthesis to take place. , a green pigment that absorbs light energy for photosynthesis. However, chloroplasts are not found in all plant cells.