Experiment to Compare Stomata Density in Different Dicotyledonous

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Experiment to Compare Stomata Density in Different Dicotyledonous

Aim: To investigate if stomata density on leaves in different dicotyledonous plants is effected by there country/ eco-system of origin. I will also compare the upper and lower epidermis stomata density to see were it lies.

Information on stomata and Hypothesis Based Upon this Information:

Diagram 1: Structure of a leaf.

The lower and upper epidermis along with the stem of a plant may contain stomata. These are openings through which gases are exchanged with the atmosphere and water is lost, this is called transpiration. Carbon dioxide is need in the process of photosynthesis. Carbon dioxide is diffused in through the stomata for photosynthesis and some carbon dioxide is produced through respiration along with the production of water which transpires out. These openings are surrounded by specialized crescent shaped guard cells, which changes their size and shape to change the size of the stomatal openings. This regulates the gas exchange e.g. open more gas exchange, closed no gas exchange. These guard cells have different stimulus to active or deactivate the openings; light, CO2 concentration, humidity and wind speed. The epidermis is covered with a waxy coating