LAB NO.: 4
SYLLABUS TOPIC: Cellular structure
AIM: To draw a tissue map of a dicotyledonous root.
APPARATUS AND MATERIALS: Microscope, slides of the dicotyledonous root, and drawing materials such as pencils, ruler, and an eraser. METHOD/PROCEDURE: -The microscope was set on the tabletop (a flat, sturdy surface) where there was plenty of room to work with and was plugged into a power source. -The slide of the specimen (dicotyledonous root) was placed onto the stage of the microscope. -Using the microscope, the specimen was observed under low power objective (x10) and (x4) to get an overview of the specimen. -Then the layers of different plant tissues were observed again but that time more carefully and meticulously for detail. -The layers of different plant tissues were then drawn on paper with accurate portion of each layer to each other. RESULTS/OBSERVATIONS:
*REFER TO PAGE 2 FOR DRAWING OF THE LAYERS OF DIFFERENT TISSUES IN THE ROOT, THAT IS, THE TISSUE MAP OF THE DICOT. ROOT.
DISCUSSION: The root system of a flowering plant begins its development from the hypocotyl of the embryo of the seed which give rise to the primary roots. Roots generally grow downwards into the soil (positive geotropic). Roots do not bear leaves and therefore there no nodes present. Two kinds of root system can be distinguished in flowering plants: tap root system and adventitious root system. Usually dicotyledonous plants posses tap root systems while monocotyledonous plants posses the adventitious root system. Tap Root System: The primary root grows vertically down into the soil in the tap root system. Later lateral or secondary roots grow from this at an acute angle outwards and downwards, and from these other branches may arise. The main or primary root is known as the tap root; together with its many branch roots it forms a tap root system. Adventitious Root System: The primary root usually dies at an early stage and is replaced by numerous roots that...