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

The transpiration rate of a plant cutting is affected by the wind speed of the air in the atmosphere surrounding it.

Extracts from this document...

Introduction

PLAN HYPOTHESIS: The transpiration rate of a plant cutting is affected by the wind speed of the air in the atmosphere surrounding it. I think that the transpiration rate of a plant will increase if the wind speed increases. In the absence of any air movement the water vapour which diffuses from the stomata accumulates near the leaf surface. This reduces the water potential gradient between the moist atmosphere in the stomata and the drier air outside. The transpiration rate is thus reduced. Any movement of air tends to disperse the humid layer at the lead surface, thus increasing the transpiration rate. The faster the wind speed, the more rapidly the moist air is removed and the greater the rate of transpiration. METHOD: In order to investigate that wind speed affects the transpiration rate of a plant I will measure the transpiration rate of a plant shoot cutting using a photometer and a fan where I will regulate different wind speed and then measure the transpiration rate at different wind speeds. ...read more.

Middle

The tap should then be turned to close off the syringe. * Measure the distance moved by the air bubble in the calibrated capillary tube in a given time. Re[eat the procedure three times, using the syringe to return the air bubble to zero each time. This experiment will be done three times in five different wind speeds. Once with no wind, and then gradually the wind speed will increase each time using the different wind speed settings on the fan. CONTROLLED VARIABLES: There are many controlled variables which have to be the same throughout the whole investigation: * The temperature: A change in temperature affects both the kinetic movement of water molecules and the relative humidity of air. A rise in temperature increases the kinetic energy of water molecules and so increases the rate of evaporation of water. At the same time it lowers the relative humidity of the air. ...read more.

Conclusion

* The Plant: The plant cutting must be the same one throughout the whole experiment. A different plant cutting could alter the results and change the transpiration rate due to the no. of xylems they have, also the length and diameter of plant may differ, and therefore the force by capillary action could differ affecting the transpiration rate of the water. APPARATUS LIST: * Knife to cut leaf shoot * Potometer * Fan * Beaker * Stop Clock * Thermometer * Water * Plant RISK ASSESEMENT: When carrying out this investigation there must be many precautions one must take into account to ensure complete safety. One must be careful as one is using a lot of glass ware which can easily break and become potentially dangerous. Also when using the knife to cut a shoot off a plant one must be careful not to cut oneself. One must act in a calm orderly manner in the laboratory as there is a lot of equipment and toxic materials which can be very dangerous if one acts carelessly. ...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. The effect of wind speed on the rate of transpiration.

    Next I will set up the fan then measure 20, 40, 60, 80,and 100cm away from this and mark it down on the table. I will use an anemometer to measure the wind speed of the highest setting on the fan and I will record it down.

  2. Factors affecting the rate of transpiration

    But windy conditions dispers the water vapour. Increasing the gradient in water potential does increase the rate of transpiration. The external factor which has the greatest effect on transpiration is temperature. The higher the temperature, the greater the rate of evaporation of water from mesophyll cells and the greater the saturation of the leaf atmosphere with water vapour.

  1. The investigation is aiming to look at transpiration.

    Once inside the root, water and minerals ions can move from cell to cell across the cortex of the root from the epidermis to the central tissue by three pathways. THE APOPLAST WAYS Here most of the water travels from the cell to cell through the cell walls, which is

  2. An Investigation into Species Diversity with distance along a Pingo.

    test 67.286 16.900 Null hypothesis rejected, there was a significant difference in the distribution of Buttercup along the pingo ladies bedstraw distribution chi-squared 90.757 16.900 Null hypothesis rejected, there was a significant difference in the distribution of Ladies Bedstraw along the pingo white leaf clover distribution chi-squared 50.242 16.900 Null

  1. Free essay

    Solar Desalination Plant

    For detail calculations based on the annual daily solar exposure taken from the Bureau of Meteorology = 18 MJ/m2, refer to APPENDIX A2. 3.2 Structural Integrity For optimum efficiency and operating conditions, the tank where the distillation process occurs must be at a pressure below 101kPa (atmospheric pressure)

  2. Three separate experiments which are to be carried out to investigate a plant's unique ...

    When the cell is flaccid, the stomata close. Because the wall facing the stomata is thick, the cell cannot stretch. This causes the cells to stretch in such a way that they 'bow' as shown in (a), opening the stomatal pore.

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