Since measurements were taken every 10 minutes for an hour, the total cumulative transpiration at the end of the 60 minute period will be the transpiration rate per hour. A potometer provides an indirect measurement of the transpiration rate – it measures how fast water is absorbed, which is related to how fast water vapour is being lost. Ganong’s photometer is the apparatus to record the rate of transpiration in a cut shoot. (f) Any two parts of a leaf which allow transpiration (g) The structure in a leaf that allows guttation (h) Loss of water as droplets from the margins of certain leaves. A simple potometer (figure 1) where the distance travelled by an air bubble was used to measure the rate of water uptake from the plant.Figure 1 The distance (in cm) travelled by the air bubble at a period of time (in h) was taken to be the transpiration rate for the plant. Which of the following is used to determine the rate of transpiration in plants. The potometer measures the amount of water lost from a leafy shoot by monitoring the rate at which an air bubble moves along the narrow tube as the leafy shoot sucks up water to replace the water lost by the transpiration of the plant. Record the amount of water lost during the day and during the night. (d) A plant in which the stomata are sunken. View All. (e) The apparatus to record the rate of transpiration in a cut shoot. Nerium is the plant in which the stomata are sunken. due to water loss, or by measuring the volume of water absorbed. • • Chemistry. Vaseline is applied around the rubber bungs to ensure an airtight seal, thus the only water loss from the apparatus is via transpiration. Together with the exchange of CO 2 it determines the water use efficiency. The water retained by the plant is so minute that it can be neglected. Is there any model based instrument to directly measure the transpiration rate of plants? Conclusions: Different environmental conditions have an effect on transpiration rate in plants. At the end of the day, carefully remove the bags to ensure that you do not lose any water. A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. The main type of potometer is the ‘bubble’ potometer shown in the figure below. Draw a table and record the class’ results. Google Scholar The two parts of a leaf which allow transpiration is stomata and cuticle. In this investigation students look at the rate of water uptake by a shoot, due to transpiration, using a simple but effective potometer. Give suitable explanation for the following: (a) A higher rate of transpiration is recorded on a windy day rather than on a calm day. Give two reasons why the potometer does not truly measure the rate of transpiration (3) Water used for support / turgidity Water used in photosynthesis; Water produced in respiration; Solution:- Transpiration increases with the velocity of wind. Place your finger over one end of the straw to stop the water from running out. A potometer measures the rate of transpiration by measuring the movement of water into a plant. What instrument measures the rate of transpiration? Seal with Vaseline. Solution:-(a) False. Large amount of water gets into the plant. The potometer measures the rate of uptake of water. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. A potometer measures the rate of water uptake rather than the rate of transpiration. Register or login to receive notifications when there's a reply to your comment or update on this information. 6. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. If not, all the water will run out when you take your finger off the straw. The more the number of stomata per unit area of leaf, the greater is the transpiration. Acta Universitatis Agric. Continue taking measurements for 1 hour. Make sure it is air tight and water tight. (b) Potometer is an instrument used for measuring the rate of transpiration in green plants. Since the plant transpired 23.45 mls in 30 minutes you could use that data to determine the average rate using the equation: Average rate=distance/time. Transpiration is a physiological process of plants where the plant looses water in the form of water vapor through the aerial parts of the plant. On this page you can read or download apparatus used to investigate the rate of transpiration in PDF format. 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