Transpiration Lab Essay

Transpiration is the process through which water is lost from a plant. Water is taken into a plant through roots and root hairs by osmosis, and it exits the plant through stomata. Transpiration helps the diffusion of both O2 and CO2 plus it helps the movement of water throughout the plant. There are some factors that affect the rate of transpiration of the plant. Those factors are mainly humidity, soil water supply, sunlight, temperature and wind.

Any alteration of these factors will have an impact on the rate of transpiration and other metabolic activities occurring throughout the plant. As being said, wind, one of the factors affecting transpiration rate is a major one. In the presence of a windy environment, plants will do transpiration more as the removal of water from the leaves will be faster. Aim: To observe the relationship between the impact of moving air and the transpiration rate of a basil plant branches within the interval of 1 hour.

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Research question: Does moving air (wind) have an impact on the rate of transpiration of a plant? Hypothesis: Plants that are put near the windy conditions will have a higher transpiration rate than plants put under still air conditions because removal of water molecules from leaves will be faster. Variables: VARIABLES| | Independent Variable | Wind | Dependent Variable| Transpiration rate| Controlled Variables: Time (by chronometer) Type of plant

Temperature (same environment) Light (same environment) Humidity (same environment) Material List: A chronometer A fan A basil plant A knife A balance Method: 1. Carefully cut two branches containing same number of leaves (if possible branches having equal amount of leaf areas) from the basil plant with the knife. 2. Weigh their initial masses by the balance and record them. 3. Put one of the branches in which there is no moving air and one to the in front of fan. . Start the chronometer at the same time as the fan begins. 5. Wait for 1 hour to branches to do transpiration. 6. Stop the chronometer at 1 hour and weigh the masses of branches and record their final masses. 7. Subtract final masses from the initial masses and divide them by 60 minutes to calculate transpiration rates (g/min) 8. Contrast the transpiration rate of two branches by looking at the calculated results