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Lab Activity Name: Test for the Presence of Starch in a LeafCourse Name: Plant Physiology and Genetics and Evolution LabCourse ID: BIOL2401LSection: 1Lab Number: 7Student Names: Leneigh Arzu, Samantha MahungDate: October 17th, 2019Date Due: October 31st, 2019Lecture Name: Mr. Josue Ake
INTRODUCTION:Photosynthesis is the process by which light energy is harvested by chlorophyll and used to convert inorganic raw materials - carbon dioxide and water to the products glucose and oxygen (A. Vidyasagar, 2018). Most photosynthesis takes places in the green parts of plants, in particular the leaves.One of the products of photosynthesis is C6H12O6, or glucose. As the plant receives sunlight it is constantly producing glucose and then transporting it outside of the chloroplast. However,the plant cannot transport glucose out of the chloroplast as fast as it is produced. To solve this problem the plant combines the glucose molecules into a larger molecule called starch. The glucose molecule is a monosaccharide that through the process of dehydration synthesis can form a larger molecule called a polysaccharide. This polysaccharide, starch, is stored inside the chloroplast until it can be transported. Iodine is a specific stain for starch, producing a black color (actually a very dark blue) where starch is present. (C. Forde, 2016)MATERIALS:Hibiscus and Blackberry leaves (one of each that was in the sun and one of each that has been kept in the dark)BeakerTap water