Hydathodes is the structure in a leaf that allows guttation. Also on a cloudy day, the air is already dense with the water molecules and can not fill anymore. (i) Which leaf would become most limp? Humidity When there is a high rate of wind activity, transpiration is relatively higher since the moist or humid air around the plant is quickly replaced by less humid air allowing the plant to release even more water into the atmosphere. 4. (c) The structure of stoma remains same in monocots as well as in dicots. High humidity in the air reduces the rate of outward diffusion of the internal water vapour across stomata, thereby reducing the rate of transpiration. (d) Would it make a difference if the experimental set-up is kept in bright sunshine? Stomata remain open during daytime for gaseous exchanges for photosynthesis and respiration. The purpose of the spring balance in the set-up is to measure the change in weight of the set-up. The stomatal pores open and close in response to environmental changes and conditions within the plant, and they play an important role in regulating transpiration. (C) coated on both surfaces At night they are closed. 2. Closing of stomata and shedding of leaves reduce transpiration. 2013). The rest of it is almost lost to the atmosphere as water vapour as a result of transpiration. The three adaptations in plants to reduce the transpiration are, 1. Justify. (e) Most transpiration occurs during mid-day. Transpiration would occur faster. So plants lose water in the form of water every day into the atmosphere through transpiration. Water is transported faster during daytime because rate of transpiration is higher during daytime. Stomates are necessary to admit carbon dioxide for photosynthesis and to release oxygen, hence transpiration is generally considered to be merely an unavoidable phenomenon that accompanies the real functions of … Best Answer (d) hot, dry and windy . Answer the questions that follow: Transpiration is the process being studied. (c) Why was the pot covered with a plastic sheet? Lenticels are special opening that develops on the barks of the older stem in place of stomata. Transpiration is the loss of water as water vapour from the aerial parts of the plant. The blue colour of the cobalt chloride paper in the third bell jar (C) does not change at all and there are no water drops on the jar’s inner walls either. Method: 1. (f) Any two parts of a leaf which allow transpiration. It also cause the stomata to open, thus more transpiration occurs during the day and the rate is higher on a sunny day compared to a cold dull day. Why? We at BYJU’S have prepared the Selina Solutions Concise Biology Class 10 Chapter 5, wherein questions are answered with detailed explanations. (b) The process by which the intact plant loses water in the form of droplets. How would you demonstrate transpiration in it? This because as the plant transpires, it creates the suction force in plant which allows roots to absorb more water from the test tube. ADVERTISEMENTS: The below mentioned article includes a collection of thirteen experiments on transpiration. (e) Cork and bark of trees help in preventing loss of water. A twig of some suitable plant cut with a sharp knife is fixed in an apparatus as shown in fig. The leaves of certain plants exhibit droplets of water along their margins in the morning. (e) Mention two ways in which this process is beneficial to plants. The leaves of certain plants roll up on a bright day, in some cases, leaves may get wavy, rolled or folded to reduce exposed surface. Fastest transpiration rate in the sun with wind. Transpiration rate is faster during a sunny day because of the sun ⛅. 1. The plant sap escapes from the ruptured or cuts surfaces of a plant. 9. The first bell jar (A) would show water vapour condensing on its inner walls. Most of the transpiration in tall trees occurs through (a) Stomata (b) Lenticels (c) Cuticle (d) Bark. 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In an experiment, four freshly plucked leaves (A-D) of a plant, such as those of China Rose, was treated as follows: Solution:-(b) Lenticels. Answer 7 (d) hot, dry and windy. (ii) Transpiration creates a pull for the upward movement of the sap. This is because oil is putting on the test tube. (c) Atmospheric humidity promotes transpiration from a green plant. (g) On a bright sunny day, the leaves of certain plants roll up. Leaves have pores all over them that you can see if you look closely on the bottom side with a magnifying glass. Sunken stomata: – The stomata may be sunken or covered by hairs. This evaporation reduces the temperature of the body surface and brings about cooling in the body of the organism. More transpiration occurs from the undersurface of a dicot leaf. ICSE Rankers is a free educational platform for icse k-12 students. The stomata may be sunken or covered by hairs. The leaves of certain plants exhibit droplets of water along their margins in the morning. 2. Experiment to demonstrate the transpiration phenomenon with the bell jar method: ADVERTISEMENTS: Requirements: Bell jar, well-watered potted plant, rubber sheet, glass plate, Vaseline. 8. Photometer is a device that measures the rate of water intake by a plant and this water intake is almost equal to the water lost through transpiration. (c) Transpiration helps in creating …………. As transpiration proceeds, i.e., as the water is lost from the twig, a suction force is set up which pulls the water from the beaker and the bubble in the capillary tube moves along. (b) Hydathodes are similar to stomata in plant physiology. Ganong’s potometer is used to measure the rate of water intake by a plant. (f) Perspiration and transpiration help to cool the body temperature of the organism. Name the following: Ganong’s photometer is the apparatus to record the rate of transpiration in a cut shoot. (a) Potometer is an instrument used for demonstration of transpiration occurring from the lower surface of a leaf. (g) The structure in a leaf that allows guttation. Transpiration helps in creating suction force and in eliminating excess water. (A) coated with Vaseline on its upper surface 3. Hydathodes are special pore-bearing structure present on the margins of the leaf to allow this exudation. Potometer is a device that measures the rate of water intake by a plant (L. poton: drink, meter: measure), and this water intake is almost equal to the water lost through transpiration. Question 8. 1. The purpose of putting oil in the test tube is to prevent the loss of water by evaporation. An air bubble is introduced into the horizontal graduated capillary tube which dipping into the beaker containing water. Now, keep all the three bell jars together in the sun. A stomata is surround by two bean-shaped guard cells. Hence, the stoma from the diagram can be of a monocot leaf or of a dicot leaf. Leaves of some plants wilt during midday and recover in the evening. A tree loses more than 30 litres of water per day. 2. (b) Excessive transpiration results in the wilting of the leaves. As a result, the movement of the air bubble would be larger since there would be more loss of water due to transpiration as the velocity of wind/air increases. (d) The spring balance progressively measures the change in weight of the set-up. Solution:-. All plants continuously absorb water through their roots. (b) Most transpiration occurs at mid-day. At night they are closed. 5. (D) left uncoated. 1 answer. Fast moving air currents continually bring fresh, dry masses of air in contact with leaf surfaces and thus maintain a high rate of transpiration. The water can be collected at the end of the day, when the transpiration cycle is complete. The third bell jar in this experiment is a control which proves that there was no moisture in the air due to transpiration as there was no plant in it. In both perspiration and transpiration, water is lost by evaporation from the body of the organism as water vapour. 6. The factors that accelerate the rate of transpiration are. Solution:-. Throughout the day, as the sun shines on the bag, condensation will form and the water droplets will collect in the reservoir. One of the internal factors which affect the rate of transpiration, is, (a) big size of the leaf (b) Colour of the leaf, (c) lower epidermis of leaves (d) hydathodes, 6. The. Third fastest in the shade with no wind. Transpiration is the loss of water in the form of water vapour from the leaves and other aerial parts of the plant. So transpiration rate is higher. (a) Hydathodes and ……………………………… 7. Weight of test tube B is taken before and after the experiment remains the same because no loss of water occurs in test tube B. The two parts of a leaf which allow transpiration is stomata and cuticle. Second fastest in the sun, but no wind. As Cork and Bark of trees are tissues of old woody stems. The leaf C shows the least limping. Sunlight Direct sunlight has the same effect as temperature as it warms the leaves up quicker. The root pressure generated by a plant assists in bleeding. They remain open all the time. Therefore, more transpiration occurs during the day. The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. Before keeping the leaf in between the cups, anhydrous calcium chloride (CaCl2) contained in two small vials were weighed and placed in both the cups. (a) Name the phenomenon being demonstrated. The purpose of using the monometer in order to measure the pressure exerted by the fluid. Students of Class 10 are suggested to practice Selina Solutions to strengthen the fundamentals and be able to solve questions that are usually asked in the examination. (a) Openings on the stem through which transpiration occurs. Solution:-. Some plants show wilting of their leaves at noon even when the soil is well watered. In such cases, the rate of transpiration during midday exceeds the rate of absorption of water by the roots. After completing all these processes, transpiration takes place. Solution:-. Most of the transpiration in tall trees occurs through (a) Stomata (b) Lenticels (c) Cuticle (d) Bark. (b) Potometer is an instrument used for measuring the rate of transpiration in green plants. We all know that plants need water. All the four leaves A, B, C and D were left in a room for about 24 hours. This would prevent the escape of water vapour from the pot. Transpiration will be fastest when the day is (a) cool, humid and windy. 2. Perspiration and transpiration help to cool the body temperature of the organism. (iv) Voltmeter is an instrument used for measuring the rate of transpiration in green plants. 5. (2003) provided that a single corn plant transpired almost 500 liters of water during a 4-month growing period. Droplets of water may sometimes be seen along the margins of the leaves of a banana plant, growing in wet soil in the mornings. Question A.8. More the, (e) Cork and Bark of trees are tissues of old woody stems. (e) The apparatus to record the rate of transpiration in a cut shoot. Transpiration occurs as long as the stomata are open, but it stops when they are closed. 1. Cuticular transpiration: Cuticle is an impermeable covering present on the leaves and stem. (ii) Which leaf would show least limping? High humidity in the air reduces the rate of outward diffusion of the internal water vapour across stomata, thereby reducing the rate of transpiration. 1. The readings on the capillary tube would give the volume of water lost in a given time. 4. Fewer stomata:- The number of stomata may be reduced. Plant takes water, dissolved essential plant nutrients and minerals from the soil with the help of the roots through the process of osmosis. Transpiration increases with the velocity of wind. (B) coated on the lower surface. Transpiration is the process is beneficial to plants. A humid environment hampers transpiration while the roots continue to absorb water from the soil. Set-up A. Nerium is the plant in which the stomata are sunken. It causes around 20% of transpiration in plants. Factors that affect the rate of transpiration also affect water uptake by the plant. 3. At 30°C, a leaf may transpire three times as fast as it does at 20°C. In some plants, e.g. It is the removal of water from the plant because of injury. These allow diffusion of gases for respiration as well as for photosynthesis. Most of the transpiration in tall trees occurs through (a) Stomata (b) Lenticels (c) Cuticle (d) Bark. [This is done by lifting the bent capillary tube the coloured water so that air may be sucked in due to suction pull and is again dipped into the water.] After a few hours the weight of the CaCl2 vials will increase because they will absorb water lost by the leaf of the plant due to transpiration. Solution A.7 (d) hot, dry and windy. Solution 6: (d) transpiration Question 7: Transpiration will be fastest when the day is (a) cool, humid and windy (b) hot, humid and still (c) hot, humid and windy (d) hot, dry and windy Solution 7: (d) hot, dry and windy Question 8: Most of the transpiration in tall trees occurs through (a) … As a result, there would be no movement of the air bubble and it would remain stable. Solution:-. (c) Why are glass slides placed over the dry cobalt chloride papers? (iii) Wind velocity has an effect on transpiration. Hence, the water in the test will get reduced. Transpiration will be fastest when the day is (a) cool, humid and windy (b) hot, humid and still (c) hot, humid and windy (d) hot, dry and windy. Also Read: Transportation in Plants (c) Yes, the transpiration rate will increase. By practising Selina Solutions, students are able to score good marks in Biology. (d) More transpiration occurs from the lower surface of a dorsiventral leaf. Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers.Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism. Loss of water as droplets from the margins of certain leaves is called guttation. If the wind blows faster, the water vapour released during transpiration is removed faster and the area outside the leaf does not get saturated with water vapour. Therefore, more transpiration occurs during the day. 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