Stomata shielded by hairs. The genus Oryza , which includes rice ( Oryza sativa and Oryza glaberrima ) and wild relatives, is a useful genus to study leaf properties in order to identify structural features that control CO2 access to chloroplasts, photosynthesis, water use efficiency, and drought tolerance. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. Q. Transpiration is. Give a suitable explanation for the following: (a) A higher rate of transpiration is recorded on a windy day rather than on a calm day. To do this, divide the rate of transpiration (step 1) by the total surface area. Solution:-(a) False. There is a close inter-relationship between transpiration and leaf structure. answer choices . Rolled up leaves reduces the surface area exposed to the lower water potential in the environment therefore reducing rate of transpiration as rate of diffusion is lowered. The main type of potometer is the ‘bubble’ potometer shown in the figure below. Greater is the value of resistance; slower will be the transpiration rate. Record the calculated total surface area here: _____ 3. The leaf wilts completely in this case. Types of Transpiration. Leaf structure: The leaves with surface stomata, thin cuticle have high rate of transpiration. Tags: Question 9 . (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. The unit of transpiration rate is the moles of water lost in per leaf area per time (mol/cm2/s). provided the transpiration rate was low (0.4 g/dm^ leaf/hour) but when the transpiration rate was raised threefold, Afr, rose steeply to a value of 12 atm., a steady state value being approached in about 8 hours (see Fig. Root shoot ratio: Transpiration increases with root shoot ratio. Wind: higher winds increase the rate of transpiration. Transpiration. Experiment to Compare the rate of transpiration from both the surfaces of leaf by Garreau’s Potometer: 10. 30 seconds . 3). To measure the rate of transpiration we use a piece of equipment called a potometer. Tightly packed cells in the upper half of the leaf containing many chloroplasts ... Humidity: the lower the humidity the faster the rate of transpiration. A majority (90%) of transpiration takes place via leaf surface, and a process refers as “Foliar transpiration”. SURVEY . This experiment proves that the rate of stomatal transpiration is fairly higher than the cuticular transpiration. Calculate the rate of transpiration/surface area. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. Transpiration is the loss of water vapour through evaporation from a plant’s surface.It mainly happens through gaps in the leaf called the stomata, which need to open during the daytime to allow gas exchange.Plants need to take in carbon dioxide for photosynthesis and get rid of oxygen, which happens through the stomata. 4. On reducing the transpira-tion rate… The user above me has also a valid statement too ... but it will be more than it was without the rolling up of the leaf. Tags: Question 8 ... Stomata in rolled leaves. It increases transpiration rate. (b) Potometer is an instrument used for measuring the rate of transpiration in green plants. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. the movement of water through a plant from the roots up the stem ... Q. (c) An instrument used to find the rate of transpiration (d) A plant in which the stomata are sunken (e) The apparatus to record the rate of transpiration in a cut shoot. The D leaf is not vaselined and both the surfaces transpire freely releasing much water. The more the number of stomata per unit area of leaf, the greater is the transpiration. Xerophyte adaptations to reduce transpiration ... Spines instead of leaves to reduce surface area for transpiration. e. Divide the total mass of the leaves by the mass of l cm2 to find the total leaf surface area. It decreases transpiration rate. (iv) Voltmeter is an instrument used for measuring the rate of transpiration in green plants. These rate … 9. 2. the roots, A IF, was also 6 atm. Main type of potometer is an instrument used for measuring the rate of transpiration green... Leaf by Garreau ’ s potometer: transpiration we use a piece of equipment called potometer. 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