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

Measuring the effects of wind and light on the transpiration rate in a leaf

Extracts from this document...

Introduction

Alexander Templet Transpiration Rate in Solanum lycopersicum Biology 156 Summer 2008 Mr. Leith Adams, Instructor ________________ Abstract Plants draw water up through their roots and out through their leaves. This process is known as transpiration. The transpiration rate is a major determining factor in how quickly plants absorb water, and is thus critically important to understand for agriculture. In order to study how varying weather conditions affect the rate of transpiration, we conducted experiments using stems of the tomato Solenum lycopersicum. Our results showed increased transpiration when the plants were subjected to wind and also when subjected to light. Interestingly, wind and light combined did not increase transpiration as greatly as light acting alone. Introduction Plants draw water in through their roots, and then transport it through the xylem up to the branches and leaves. Water exits the leaves through the stomata in the form of water vapor. Polarity causes the water exiting through the stomata to draw after it the water in the xylem, which then pulls in more water through the roots. ...read more.

Middle

Satisfied that there were no leaks, we measured the distance of the water from the tip of the pipette and used this as the zero measurement for our readings. As a control, we first measured the transpiration rate without any simulated weather variables. We measured the distance of the water from the tip of the pipette at five minute intervals for fifteen minutes, giving us three measurements after our zero reading. Each measurement was recorded in millimeters, and once the fifteen minutes were complete, we calculated the average transpiration rate by subtracting the zero measurement from the final measurement. This difference was then divided by fifteen to give the rate of millimeters per minute, and we multiplied this figure by 1.136 to convert our result into microliters per minute. After completing our control set of readings, we flushed the transpirometer again as described above to set it up again for our weather variable. My group was assigned to conduct our second reading using a small electric fan to simulate wind. We placed the fan 30 centimeters from the plant, and blew it onto the leaves while we repeated the process used to measure the transpiration rate in the control. ...read more.

Conclusion

This may be that the wind cooled the plant and thus counteracted the heat of the light, which we believed to be the primary reason why light would increase transpiration. The effect of light on transpiration was thus largely negated when acting in combination with wind. These discoveries are of very real significance for agriculture, where plants must be cultivated and watered to maximize growth. Careful study of how weather affects plant transpiration, and thus water loss, can help farmers determine how much to water their crops to maximize growth without overwatering them. Literature Cited Raven, P. H., G. B. Johnson, J. B. Losos, S. R. Singer. 2002. Biology, Seventh Edition. McGraw Hill, Boston. 1250 pp. Tartachnyk, I. I., and M. M. Blanke. "Photosynthesis and Transpiration of Tomato and CO2 Fluxes in a Greenhouse Under Changing Environmental Conditions in Winter." Annals of Applied Biology 150.2 (2007): 149-156. Academic Search Complete. EBSCO. Ellender Memorial Library, Thibodaux, LA. 14 July 2008. Vodopich, Darrel S., and Randy Moore. 2002. Biology Laboratory Manual, Seventh Edition. McGraw Hill, Boston. 555pp. Page ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. Lion King-The Ecological study

    they want from the nature; resulting in an unbalance ecosystem...The third way is that when the herds move away from the Pride Rock land, thus shutting off a vital food source for all lions, cheetahs and predators that inhabit the Pride Rock land.

  2. The Effects of Salinity on Wheat Germination

    0.5 0.5 0.5 0.5 0.5 1.0 0.5 0.5 1.0 0.0 0.0 5.5 2% number 6 0.0 0.0 0.0 0.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 1.0 0.5 0.5 6.0 2% number 7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2% number

  1. internal assessment rate of transpiration

    30 0.82 0.70 0.82 0.80 Table 2; the mass of entire apparatus in SET B experiment for rate of transpiration of plant in different humidity of air with respect to time. SET C Time taken, minutes (min) � 0.01 Mass of entire apparatus, Newton (N)

  2. Environmental Factors affecting plant growth

    It could also induce potassium deficiency which could also be problem for the plant. An observation made during the experiment was the rate of plant growth. The plants grew very slowly. Maybe this was due to the type of seed or due to the deficiency of phosphorus but as I

  1. Pros and Cons of GMO crops

    This high percentage has aroused concerns among quite a few scientists as they are unsure about the benefits of genetically modified crops. Jane Rissler a senior staff scientist with the Union of Concerned Scientists has lately been worried about the safety of using GM crops.

  2. Environmental Mangement - Upland Burning in Ireland and the Effects of the Heritage Bill ...

    Fires in the uplands can have a significant influence on the rates of erosion and distribution of biodiversity determining the overall habitat characteristics (Davies, et al., 2008). Wildfires destroy the food stores and nesting sites of birds and other wildlife.

  1. Comparing the Sexy Sons Hypothesis and the Pathogen Avoidance Models Effects on Sexual Selection

    seems to back up the theoretical prevalence of polygamy where monogamy currently exists. Many theories for the justification of the presence of monogamy exist but I will be going over the process of male mate guarding. Male mate guarding is defined as the close association between a male and female

  2. Examine the correlation between soil moisture at different heights up the slope and the ...

    measured, our recording is therefore based upon perspective which is unreliable as everyone?s perceptive of what may be the longest leaf may be different. Therefore by measuring each leaf there would be no debate as to which leaf is longest.

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