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. Wind: higher winds increase the rate of transpiration. Solution:-(a) False. 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. answer choices . (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. 3). This experiment proves that the rate of stomatal transpiration is fairly higher than the cuticular transpiration. Experiment to Compare the rate of transpiration from both the surfaces of leaf by Garreau’s Potometer: 30 seconds . 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. To measure the rate of transpiration we use a piece of equipment called a potometer. 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. Types of Transpiration. The unit of transpiration rate is the moles of water lost in per leaf area per time (mol/cm2/s). Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. The more the number of stomata per unit area of leaf, the greater is the transpiration. (b) Potometer is an instrument used for measuring the rate of transpiration in green plants. (iv) Voltmeter is an instrument used for measuring the rate of transpiration in green plants. Transpiration. 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. Xerophyte adaptations to reduce transpiration ... Spines instead of leaves to reduce surface area for transpiration. 9. On reducing the transpira-tion rate… Greater is the value of resistance; slower will be the transpiration 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. Q. Transpiration is. Stomata shielded by hairs. SURVEY . Calculate the rate of transpiration/surface area. There is a close inter-relationship between transpiration and leaf structure. Tags: Question 8 ... Stomata in rolled leaves. Tightly packed cells in the upper half of the leaf containing many chloroplasts ... Humidity: the lower the humidity the faster the rate of transpiration. To do this, divide the rate of transpiration (step 1) by the total surface area. The D leaf is not vaselined and both the surfaces transpire freely releasing much water. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). (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. 4. It increases transpiration rate. The main type of potometer is the ‘bubble’ potometer shown in the figure below. A majority (90%) of transpiration takes place via leaf surface, and a process refers as “Foliar transpiration”. Leaf structure: The leaves with surface stomata, thin cuticle have high rate of transpiration. 10. 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