• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Does Leaf Surface Area Affect the Rate of Transpiration in a Plant?

Extracts from this document...


Does Leaf Surface Area Affect the Rate of Transpiration in a Plant? Aim: The aim of my investigation is to find out if the leaf surface area affects the rate of transpiration in a plant. Variables: The variables of this experiment are;- * The leaf surface area * Temperature of the surrounding air * The speed and amount of wind * The amount of light Environmental Factors: Temperature of air The temperature of the air affects the rate of transpiration. If it is a hot day then the heat will evaporate some of the water and then the leaf will have less water and so it will increase the rate at which the leaf can transpire. Wind The wind also affects the rate at which a leaf can transpire. When the wind blows it carries hot air under the leaves which carries some of the water vapour, thus increasing the rate of transpiration in the leaf. Light When there is a lot of light, a leaf will photosynthesis at a faster rate and so the water is used more and therefore with less water the leaf can also increase the rate at which it transpires. ...read more.


(To do this trace the perimeter of the leaf onto the graph paper then count the amount of whole squares that it covers to estimate the amount of cm2 it covers). Record all of the areas in a table labelling each one from A - C and noting which is which. 3. Select three small sycamore leaves and measure their area too. Record theses measurements as well. 4. Label the smaller leaves D - F and make a note of which is which again. 5. Fill six test tubes with 40ml of cold water, which will be measured out accurately using the measuring cylinder. 6. Place one leaf's stalk into each of the test tubes. 7. Add a drop of oil to the top of each tube; this will prevent evaporation of the water. 8. Mark the start level of water in each tube using an OHP pen. 9. Measure using a ruler in millimetres and mark the level on the side for five consecutive days. 10. Measure the depth of each line and record the data into the table. 11. Take an average level for each day for the larger leaves (A/B/C) ...read more.


The average loss of water for a larger leaf is approximately 9.83mm/day. This estimate has been made by using the averages per day for each of the three larger leaves. This clearly shows that more water was lost from the larger leaves per day on average than of what was from the smaller leaves. Therefore this proves that the larger the surface area on a leaf the higer the amount of water loss through the more stomata, thus the faster rate of transpiration. Evaluation: My experiment was good because the average was taken through doing the experiment once and my prediction was accurate and proved by the experiment. My experiment was bad because not all the water was to an exact even level to begin with and the oil was applied evenly to each test tube. This may have changed the rate of evaporation on each test tube therefore making the test unfair. My experiment can be improved testing the leaves for more days, i.e. five instead of three, and measuring the oil and water more accurately and carefully to make sure that each leaf has the same amount of water to lose and the same amount of oil which may slow down the loss of water as it has water proof characteristics. Biology Coursework Fiona Hibbard Page 1 of 4 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Marked by a teacher

    Investigate which surface of a leaf loses more water by transpiration.

    3 star(s)

    * Spread the Vaseline as equally and thinly as possible because this will cut down the percentage error * Have two test leaves to check whether or not the test has been fair, one with Vaseline on both sides to check whether the leaf can still transpire or not, and

  2. Investigating the abiotic factors that affect the size of Ivy leaves in shaded and ...

    Whirling Hygrometer - used to measure the humidity in region. 9. Anometer - used to measure wind speed. 10. Trowel - used to dig up the soil sample from the two different areas. 11. 3 x Small plastic bags - carrying the soil sample.

  1. What factors affect the rate of transpiration.

    The water enters trough the semi permeable cell wall. When the sap vacuole is full of water it is turgid. When plant cells are turgid they can handle the pressure because they have a cell wall. In animal cells when the cells are turgid they swell up and bust.

  2. How temperature affects the rate of photosynthesis.

    After the peak formed 42.7 oC, the graph showing individual results shows a decrease in the rate of oxygen production as the temperature is increased. The rate of oxygen released recorded at 45 oC was 58.25 mm3/min and at 65 oC was 1.3 mm3/min.

  1. The investigation is aiming to look at transpiration.

    There are no barriers so the movement so it is able to diffuse freely. As the water evaporates into the sub-stomata air spaces from the wall of one cell, it creates tension, which pulls in water from the spaces in the walls of the surrounding cells.

  2. Conducting an experiment to find out what effect the surface area has on the ...

    The reason I will be monitoring the rate of water up take is that the apparatus available to me is a potometer; this device measures the water uptake in a plant. Rate of water up take is approximately the same as the transpiration as 99% of the water is lost

  1. Experiment to Compare Stomata Density in Different Dicotyledonous

    a lower stomata density. Primrose: This plant grows in North Temperate Zones of the earth. In Britain the plant grow in the spring covering forest floors. Long leaves with highly textured surface. No waxy cuticle present. Spongy leaf. ? The plant is used to growing and flowering in the damp,

  2. Ashland Oil Inc.: Trouble at Floreffe

    Citizens or citizen-action groups in the area, which were adversely affected could also bring a court action against Ashland for violating the standard. The Duquesne Light Company, located on the adjoining property, could have brought a claim of negligence for property damage sustained by the spill.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work