Testing a Leaf for the Presence of Starch
Testing a leaf for starch is the simplest photosynthesis lab.The test for starch in a leaf is also a part of the other photosynthesis experiments.
The video above shows the steps in Testing a Leaf for the Presence of Starch. The Procedure outlined below is slightly different.
Discussion Questions & Answers
1. Describe Photosynthesis. Use a symbol equation.
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. Most photosynthesis takes places in the green parts of plants, in particular the leaves.
Photosynthesis involves 2 stages - the Light-dependent Stage and the Light-independent stage. In the light-depedent stage, water is photolyzed by sunlight into Hydrogen and oxgen. Hydrogen enters the second stage, oxgen is gaseous by-product.
In the light - independent stage enzymes catalyse the reduction of carbon dioxide by hydrogen. The carbohydrate, glucose is first formed. Glucose may be immediately used, translocated in the form of fructose or sucrose or stored as starch granules.
The overall equation for photosynthesis is: