Potometer is an instrument for measuring the rate of the most transpiration in a herbaceous plant like Balsam occurs through which part. NCERT CBSE Chapter 6 Download in Pdf Life processes – The processes that are necessary for an organism to stay alive. (iii) It takes place through the leaves and stem and through the stomata and lenticels. Question 3: What is meant by the term transpiration stream ? Write the correct answer out of the five available choices given under each question: I. Transpiration 2. Study the same and answer the questions that follow: (i) Name the pis labeled A and B. (iii) Which phenomenon is studied with the help of this apparatus? Answer: The plants absorb much more water than their requirement because: (a) They require more mineral salts for their growth and minerals are present in very small quantity in water (b) Most of the water is lost through transpiration. Thus, it proves that the rate of transpiration is greater from the under surface of dorsiventral leaves. (iv) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? The apparatus used to compare the rate of transpiration in cut shoot. If the rate of transpiration becomes more than the rate of photosynthesis, plants will: (a) Continue to live, but will not be able to store food (b) Be killed instantly (c) Grow more vigorously because more energy will be available . Question 1: Transpiration and Guttation. Transpiration mostly occurs in leaves through special structures present on them called as stomat Question: 1. Summer 3. Answer: (i) The CaCl2 vials are kept inside the cup to absorb water. Transpiration in plants is a crucial process. Write the functional activity of the following structures: 1. (v) The purpose of setting up test-tube B is to show that in the absence of plant, there is no change in the level of water. 3. Answer: Lenticels are minute, permanent openings which may develop in the young stems of woody plants. This is called the transpiration stream. Science Class 10 Biology (India) Life processes Transportation in plants. (b) Humidity of the atmosphere. (ii) In the day time dotted arrow shows the path of CO2 while solid arrow shows the path of oxygen. (vi) Transpiration is the loss of water as water vapours from the aerial parts of the plant. (ii) Explain the process mentioned in (i) above. Answer: Stomata present, on the leaf and open only during the day while lenticel present on the stem of woody plants and open at all the times. Parts of plants such as stems, small pores on leaves, and flowers evaporate the water to the atmosphere. Xerophyte 7. CBSE Class 10 Science Notes Chapter 6 Life Processes Pdf free download is part of Class 10 Science Notes for Quick Revision. (iii) Water escapes through stomata and lenticels. (i) A (ii) B (iii) C (iv) D (v) E III. Hydathodes send out water in the form of droplets. Experiments on transpiration include demonstration of transpiration, determining site of greater transpiration, relation with absorption and suction due to transpiration. After a few hours, CaCl2 vials were taken out and weighed again. This is how the two processes are interrelated. Question 14: “A higher rate of transpiration is recorded on a windy day rather than on a calm day.” Explain. Toll Free No. (iv) Why is the surface of water covered with oil. Cuficular transpiration, Lenticular transpiration, Stomatal transpiration, Gutation. (ii) They lose water vapour and process is termed stomatal transpiration. If so, give reasons. Takes place through the stomata. Cuticular Transpiration: It occurs through the cuticle or epidermal cells of the leaves (Fig. (iv) Mention one way in which this process is beneficial to the plant. (ii) It is the release of water vapours from the aerial parts of the plant. They are covered with a protective layer of dead calls having tiny openings called lenticels. Lenticular transpiration takes place through the small openings in the corky tissue covering the stem. The upper surface has less stomata than the lower surface. (True) 8. Water escapes from the hydathodes on the margin of the leaves in the form of water droplets. Transpiration takes place only in green plants. Next lesson. After a few minutes the cohalt chloride paper shows change in colour from blue to pink. (True) 6. To obtain a continuous supply of minerals it has to absorb large quantity of water. (ii) It is process in which water in the form of vapours are released from the aerial parts like leaves and soft stems of the plant. Palisade tissue, 4. Stomata pass out water in the form of vapours. Plants lose water by guttation when: (a) Rate of transpiration is high (b) Soil is wet and the atmosphere is humid (c) Soil is dry and atmosphere is dry (d) Soil is wet and atmosphere is dry, 8. B) and the transpiration stops. Guttation 8. Extramarks offers online tutorials for ICSE class 10 Transpiration chapter. Criteria of life- (i) Growth (ii) Movement Nutrition-The process in which an organism takes in food, utilizes it to get energy, for growth, repair and maintenance, etc. Guttation is a similar process to transpiration in which some plants exudate the drops of xylem sap on the edges of the leaves. Transpiration is very important for maintaining moisture conditions in the environment. (ii) Give the function of thick cuticle layer in desert plants. The ends of the cups were closed with corks through which two mercury manometers were connected. In this process, loss of water in the form of vapours through leaves are observed. Question 7: What are lenticels ? In this experiment which plant can be considered as the uncontrolled one? (iii) Weight of test tube A will decrease after the experiment because water will be lost from it through the leaves by transpiration,. (iii) It helps in distribution of water to all parts of the plants. It protects the surface and reduces water loss. Weight of test tube B will remain same after the experiment because water will not be lost by transpiration as there is no plant in and nor by evaporation as oil is spread over it, which will not allow evaporation. 9. Experiments on transpiration include demonstration of transpiration, determining site of greater transpiration, relation with absorption and suction due to transpiration.. A change in the colour of the cobalt strip to pink is an indication of the presence of moisture. The number of stomata may be reduced. Question 1: Define transpiration. (False, More transpiration occurs from the under surface of a leaf.) Plants become cool as a result of Transpiration. (iii) Transpiration is the loss of water in the form of water vapor through the aerial parts of the plant. Hence, the guard cells become turgid and bulge outward due to their thin outer wall, thus widening the stomatal opening lying in between (Fig. (i) A, V. (v) D and E. Question 11: Given below is an apparatus used to study a particular process in plants. Transpiration DishaEducentre Exhaustive Notes TRANSPIRATION Scope of Syllabus: Mechanism of stomatal transpiration must be explained so that the concept of the process is clear. It is the process in which water droplets oozes out from the hydathodes present at the tip and margins of leaves. This force helps in the upward movement of water into the xylem vessels. 1800-102-5301 Answer: (i) Garreau’s Potorneter. Answer: (i) (b) (ii) (d) (iii) (e) (iv) (a) (v) (c), ICSE Previous Year Question Papers Class 10, ICSE Solutions for Class 10 Biology – Transpiration, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, NCC Certificate | What is NCC Certificate? In the air above, the moisture forms clouds and soon falls as rain. (ii) It results in cooling of the plant in summer. Question 8: Given below is the diagram of an experimental set up to study the process of transpiration in plants. Cuticular transpiration: Cuticle is an impermeable covering present on the leaves and stem. (Hydathodes), 1. During this time, in some herbaceous plants, the rate of transpiration exceeds the amount of water absorbed. The leaves of the Xerophytic plants have cuticular wax. Stomata 3. Roots consume some amount of water from the soil and the rest evaporates in the atmosphere. (iii) A foreign […] A thick layer of cuticle on the leaf surface help to decrease transpiration. Lenticels 4. You can watch our video lessons to understand different types of transpiration such as lenticular transpiration, cuticular transpiration and stomatal transpiration. Download CBSE Class 10 Science Transportation Notes in pdf, Science chapter notes, class notes mind maps formulas Revision Notes TRANSPORTATION ... 4.1 (c) Transpiration : Most of the water absorbed is lost through the aerial parts of the plant into air by a process called ... CBSE Class 10 Science Biology … In which beaker would you expect the greatest decrease in weight? Explain the term transpiration. 1 Mark Questions Answer : Lenticels help in facilitating the process of transpiration in woody plants. Because of their kidney shaped outline, they remain joined at their ends. (iii) What was the purpose of using a mano-meter? Question 10: Briefly explain how the rate of transpiration is affected by: (a) Intensity of light. To score more marks in your ICSE Class 10 Biology exam, you will have to write and practise the chapter questions and answers. Practice: Transportation in plants. Bleeding, Question: 1. So more water is lost than absorbed. Transpiration is important in plants for three major reasons: Cooling of the plant: the loss of water vapour from the plant cools down the plant when the weather is very hot. It acts as an organ of gaseous exchange. It is instead lost through transpiration, the evaporation of water through the leaf surface and stomata, and through guttation, which is the loss of water from the vascular tissues in the margins of leaves. If yes, what for ? Stomata, Cuticle, Lenticels, Hydathodes. Answer: (i) Transpiration. Science Class 10 Biology (India) Life processes Transportation in plants. Study the same and then answer the questions that follow: (i) What is the colour of dry cobalt chloride paper? Answer: Question 2: Transpiration and Evaporation. In bright sunlight the level of water decreases quickly. Study class 10 notes & practice ICSE board sample papers to score high in exams. Answer: Older portions of the root do not have root hairs. (iv) It is used to adjust the position of air bubble in graduated capillary tube. (iii) A foreign […] (iii) Why is the pot covered with a plastic sheet ? Answer: Question 4: Cuticular and Lenticular transpiration. They lose water vapour and process is called lenticular transpiration. If the roots of land plants remain waterlogged, then lenticels will not be able to do gaseous exchange and as a result of this plants will die. Answer: Question 8: Guttation and Bleeding. BOOK FREE CLASS (iii) Why axe glass slides placed over the dry cobalt chloride papers? Question 2: The figure below represents the vertical section of a leaf: (i) Name the parts labeled 1 to 5. Which plant would remain healthy for a longer period of time? Copyright Notice © 2020 Greycells18 Media Limited and its licensors. Transpiration pull is a physiological process can be defined as a force that works against the direction of gravity in plants due to the constant process of transpiration in the plant body. Guttation. (False, Evaporation is a physical process.) It is a non-cellular waxy layer secreted by the epidermis and it surrounds the epidermis. (v) 1. In Nerium, the stomata are present in Sunken pits. Transpiration is the loss of water In the form of water vapour from the leaves of the plant. Transpiration involves mainly the xylem cells which become active during absorption process by the roots. (vii) How many other cells are found surrounding this structure as seen in the diagram? Discussion of water transport through the xylem. Answer: (1) A—Guard cell B—Stoma. (ii) Dicot leaf. Water and dissolved mineral … Mention, if the following statements are True or False. (iii) Manometers are used to indicate the unequal transpiration from two surfaces of a dorsiveritral leaf by showing difference in rise in their mercury levels. Loss of water as droplets through leaves of an intact plant. Download Formulae Handbook For ICSE Class 9 and 10. *Lenticular transpiration is the type of transpiration which occurs through the small pores called as lenticels present in the bark. Answer: Question 3: Stomata and Lenticels. 10. Potometer is an instrument, used for measuring the rate of transpiration. Answer: (i) The colour of dry cobalt chloride paper is blue. Answer: A pulling force called suction, caused by the evaporation of water in a leaf draws a long, continuous column of water through the xylem from the root to the leaf. Question 8: (i) Name the organ in which guard cells are located and mention the main functions of these. 2. Silicon emulsions/phenyl mercuric acetate 8. 4. Answer: (i) Stomata surrounded by epidermal cells. 8. (i) These are located on the lower surface of dicot leaves and both upper and lower surfaces of monocot leaves. Cobalt chloride paper 7. Eligibility, Benefits and Apply Online, No Dues Certificate | No Dues Certificate Format for Employee and Students, Plus Two Accountancy Previous Year Question Paper March 2019, Division Of A Line Segment Into A Given Ratio, Trigonometric Ratios Of Some Specific Angles, How To Construct A Tangent To A Circle From An External Point, What Are The Instruments Used To Measure Time, How Do You Construct An Angle With Compass And Ruler. This concave-convex curvature of the two guard cells can be varied easily and this further facilitates the stomatal pore to open and close easily. 5. Method:- Prepare a list of students having free or attached ear lobes and calculate the percentage of students having each. Hydathodes 9. (iii) Regulates opening & dosing of Stomata. Takes place through hydathodes. Main function of lenticel. Answer: Transpiration rate in such plants is very high during mid day and exceeds the water absorption rate of the roots. Question 2: Name the three types of transpiration. (i) A, IV. Question 9: Guard cells are small in size and are kidney shaped in outline. (iii) Why is oil placed over water? Question 11: Describe any three conditions which affect transpiration. Question 1: Draw a labeled diagram of the stomatal apparatus and label the following in it: Stoma, Guard cells, Chloroplast, Epidermal cells and Cell wall. 10. (False, Moist cobalt chloride paper turns pink in colour.) Question 9: The apparatus shown here is Girreau’s poto-meter designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. (iv) 1. In the mechanism of opening and closing of stomata, the important factor is : (a) The presence of chloroplast in the guard cells (b) The turgid and flaccid state of the guard cells (c) The protein content of the cells (d) The starch content of the cells, 2. Given below is an example of a certain structure and its special functional activity: chloroplasts and photosynthesis (i) A (ii) B (iii) C (iv) D (v) E II. Low humidity in the atmosphere results decrease in the rate of transpiration. Answer: Transpiration is a process in which excess of water is lost in the form of vapours from the aerial parts of the plant. Recommend (0) Comment (0) 3. (ii) Due to high rate of transpiration plant suffer from loss of turgidity. Question 3: Given below are the diagrams of a certain structure in plants in two conditions. Question 6: How does a stomata differ from a lenticel ? (ii) Explain the process named in (i) above. Question 7: Forest bring in the rain, transpiration is the cause. Hi sir can you tell any four advantages of transpiration???? Besides, discover the factors affecting transpiration with elaborate explanations by a Biology expert in our video lessons. Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day. If false rewrite the wrong statement in its correct form: 1. (True) 5. In its place a same plastic bag, with its mouth tied, is kept in the bell jar. A transpiration pull could be simply defined as a biological process in which the force of pulling is produced inside the xylem tissue. As a result of this leaves collapse and plant wilts. Question 16: Describe an experiment to prove that transpiration occurs more from the under surface of dorsiventral leaves. Caused by … 7. (iv) Describe the mechanism which brings about the change in the structure depicted in A and B. Answer: (i) The guard cells are located in the leaves. Answer: The three conditions which affect transpiration are the following : Question 12: What are the advantages of transpiration to the plant ? (v) On the epidermis of leaf. Transportation in plants. Answer: Question 6: Transpiration and Perspiration. (i) Name the structure shown. Question 1: Transplanting of seedlings to flowerbed in the evening is better than doing so in the morning. Answer: (i) Stomatal transpiration. We provide step by step Solutions for ICSE Biology Class 10 Solutions Pdf. (iv) The cobalt chloride paper placed on the lower surface of the leaf will show more pink dots as there are more stomata. Defination of Transpiration in Biology The loss of excess water by diffusion through the stomata of leaves of a plant into the atmosphere is called transpiration. Hydathode: A water secreting gland found on the edges and tips of leaves of many plants. No water drops will appear in the bell jar. With our Selina solutions and concept videos, learn how water moves through a plant from roots to tips until it is released in the atmosphere. (ii) A plant with sunken stomata. The pH of the guard cells increases during day time. Question 5: Balsam plants wilt during midday even if the soil is well watered. Transpiration is very low during storms due to : (a) Presence of moisture in the wind (b) Low temperature during storms (c) High velocity of wind (d) None of the above, 6. 7. Column ‘II’ is a list of items related to ideas in Column ‘I’. Question 7: Study the diagram given below and answer the questions that follows: (i) Name the process being studied in the above experiment. Study the diagram and answer the following questions: (i) Name the process intended for study. Transpiration is the evaporation of water into the atmosphere from the leaves and stems of plants. A). 9. CBSE Class 10 Biology Activity Chapter :Heredity and Evolution Activity 1:- Observe the ears of all the students in the class. Openings found on the under surface of the dorsiventral leaf are Stomata. (d) Stop growing and gradually die of starvation, 5. Stomatal transpiration 5. Transpiration is a physiological process. (i) The apparatus used is Ganong s Potometer. Nucleus, 4. Answer: Because of their small size, guard cells are rapidly influenced by turgor changes. DishaEducentre Biology for X ICSE Exhaustive Notes ~ 1 ~~ 1 ~ 4. (ii) It lowers the rate of transpiration thus conserving water. Lower side 5. The twig may not be alive for a long duration.b. Answer: Question 1: The diagram below represents a structure found in a leaf. Loss of water from the surface of the water bodies in the form of vapour. Phloem & translocation. Guard cell of stoma. Intro to vascular tissues (xylem & phloem) Xylem & transpiration . Wilting: The collapse of leaves due to unfavourable water relations. Question 9: What is the advantage of wilting to a plant ? (v) Suggest a suitable control for this experiment. Answer: Guard cells regulate opening and closing of stomata thus, control gas exchange and transpiration. (iv) The opening and dosing mechanism of stomata is regulated by the amount of water and solutes present in the guard cells. Guard cells, 5. These are located on the stems of woody plants. The time taken for the cobalt chloride paper on the upper surface of the leaf to turn pink is much longer than for the under surface. Transpiration, Photosynthesis, Phagocytosis, Guttation. Answer: The loss of water due to transpiration tends to lower the concentration of water in the cell sap. Transpiration is defined as the loss of water vapour by the plant. Question 4: Given below is an experimental set up to study a particular process : (i) Name the process being studied. These are tiny pores present in the epidermis of leaf or stem through which gaseous exchange and transpiration occur. Give reasons to justify your observation in A & B. ii. Guttation is the elimination of excess of water from plants through : (a) Stomata (b) Hydathodes (c) Lenticels (d) Wounds. The beakers were then left for few hours and at the end of the experimental period, weights of each beaker were taken. Answer: (i) Some plants will die due to excessive water loss by transpiration. Transpiration Introduction Most of the water a plant absorbs is not used for a plant’s daily functioning. Phloem & translocation. It takes place through the thin cuticle covering the leaves of the plant. Water is lost as vapour via the stomata. 6. Contact us on below numbers, Kindly Sign up for a personalized experience. Answer: 1. Stomatal transpiration takes place through the stomata on the leaves. Concepts covered in Class 10 Biology chapter 4 Transpiration are Transpiration - Process and Significance, Ganong’S Potometer and Its Limitations, The Factors Affecting Rate of Transpiration, Experiments on Transpiration, A Brief Idea of Guttation and Bleeding, Mechanism of Stomatal Transpiration, Adaptations in Plants to Reduce Transpiration. (iii) Give a reason for your answer in (ii) above. Study the same and ansvver the questions that follow : (i) Name the apparatus. Guttation takes place generally at Night. Answer: The stomata close and there is a general reduction in the loss of water by the leaves due to transpiration. A chemical used to prevent excessive transpiration in plants. 1 Mark Questions Answer : Lenticels help in facilitating the process of transpiration in woody plants. Transpiration is not simply a hazard of plant life. 95% of the total transpiration takes place through Stomata. (v) E, II. Answer : Odd term : Phagocytosis. Answer: A pulling force called suction, caused by the evaporation of water in a leaf draws a long, continuous column of water through the xylem from the root to the leaf. Question 15: Explain the relationship between transpiration through the aerial parts and absorption by the root hairs. Transpiration pull is the biological process of force by which the plants draw water in the upward direction. Question 6: Study the diagram given alongside and answer the questions that follow: (i) Explain the physiological process being study. If for any reason the water content of the leaf is falling short, the guard cells fail to remain turgid, they turn flaccid or lose turgidity, thereby closing the stomatal opening (Fig. (True) 3. The polymer is composed of long-chain epoxy fatty acids, attached via ester linkages. In dim light or on a cloudy day the stomata are partially closed reducing the rate of transpiration. The 10% of the atmospheric moisture is contributed by the transpiration whereas the rest of it is from the evaporation. (a) Open stomata, dry atmosphere and moist soil (b) Open stomata, high humid atmosphere and well irrigated soil (c) Open stomata, high humid atmosphere and dry soil (d) Close stomata, dry atmosphere and dry soil, 7. Transpiration mostly occurs in leaves through special structures present on them called as stomat Find out about the ear lobes of the parents of each student in the class. (iii) To prevent evaporation of water from the test tube. In strong light, the rate of transpiration is more because stomata are wide open. (ii) 1. Hydathode 9. Answer: On a hot sunny day, the rate of transpiration exceeds the rate of water absorption by roots. It is the transfer of prepared food to the different parts of the plant, including the storage organs. Mainly it occurs at the leaves while their stomata are open for the passage of CO 2 and O 2 during the process of photosynthesis. (Guttation) 3. 3. 2. In the bag tied around the cactus pot ................................. During transpiration ,more the water absorbed by the roots , will the leaves will droop or wilt at the same rate. Answer: Question 2: Draw a neat diagram of the stomatal apparatus found in the epidermis of leaves and label the Stoma, Guard cells, Chloroplast, Epidermal Cells, cell wall and Nucleus. However in the evening, transpiration rate is very slow and the seedling will be able to retain the water absorbed from the soil and as a result of this they will remain transplanted. As the stomata open, the diffusion of gases in and out begins for fulfilling the need for photosynthesis and for allowing transpiration. (Phagocytosis) 2. Spongy parenchyma, 5. Plants secrete excess of water through hydathodes when atmosphere is very humid and transpiration process cannot occur. It is considered as the essential evaporation of water through the leaves. Want a call from us give your mobile number below, For any content/service related issues please contact on this number. It constitutes about 15%-20% of total transpiration. 7. (iv) Limitations in using this apparatus:-a. Bleeding 7. A night dotted arrow shows the path of oxygen while solid arrow shows the path of CO2: (iii) Yes, we can add one more arrow in the figure to show the loss of water during transpiration. They are firmly held in place by pieces of cellotapes or glass slides. It is used for the process of osmosis as semi- permeable membrane. In the absence of transpiration, excess water will get accumulated in the plant cells, and the cells will eventually burst. The guard cells have a thick inner wall facing the opening and a thin outer wall on the opposite side; their cytoplasm contains chloroplasts. Answer: (i) 1. Lenticel 8. Briefly explain how does transpiration help in upward conduction of water in the plants, Please explain the steps to measure transpiration, Explain the mechanism of stomatal transpiration step by step. Calcium chloride paper is used to demonstrate transpiration. Answer: (a) Light intensity: It increases or decreases the rate of transpiration. 3. Intro to vascular tissues (xylem & phloem) Xylem & transpiration . Answer : Odd term : Phagocytosis. Chloroplast, 2. To do so, our learning portal enables you with resources such as sample papers, practice tests and previous years’ question papers. (b) Humidity of the atmosphere: If the air outside is humid the rate of transpiration is reduced, since the outward diffusion of internal water vapour is affected. 5. (iv) What do you mean by transpiration? (ii) Is the experimental leaf a monocot or a dicot? Question 4: Where are stomata generally found ? (v) Define the term ‘transpiration’. The heart does this with so much pressure that it is capable of squirting blood up to 9 meters high. Moist cobalt chloride paper is blue in colour. All the other three terms are concerned with processes in plants. Occurs during the day when it is hot. Some water is lost continuously through the lenticular openings in the form of water vapour. Adaptations in plants to reduce transpiration … It is the "engine" that pulls water up from the roots to: supply photosynthesis (1%-2% of the total); bring minerals from the roots for biosynthesis within the leaf; cool the leaf. 11.34) and other exposed parts of the plant. Lenticular 4. In common land plants cuticular transpiration is only 3-10% of the total transpiration. 2. (iii) Transpiration. (v) The movement of air bubble in graduated tube in a minute gives the rate of transpiration. Guttation occurs through stomata. Evaporation is a physiological process. Five plants A, B, C, D and E were placed in a beaker containing water. (iii) To prevent water vapour of the air from interfering the experiment. Transpiration: Occurs early morning and at night. Water and dissolved sugars. Circulatory System and its Components. 2. Where are they found ? More transpiration occurs from the upper surface of a leaf. 8. It is instead lost through transpiration, the evaporation of water through the leaf surface and stomata, and through guttation, which is the loss of water from the vascular tissues in the margins of leaves. Transpiration is the evaporation of water from plants. Answer: Question 5: Transpiration and Translocation. Question 3: What is meant by the term transpiration stream ? (iv) How many leaf veins have been shown in this section ? (ii) After few hours, the weight of the CaCl2 vials will increase because they will absorb the water which is transpired by the leaf of the plant. ICSE Biology Previous Year Question Paper 2010 Solved for Class 10 ICSE Paper 2010 BIOLOGY SECTION-I (40 Marks) (Attempt all questions from this Section) Question 1: (a) Name the following : (i) The type of cell division which occurs in the cells of the reproductive organs. (iii) What is the most apparent difference between A and B in the structure shown ? : on a calm day. ” Explain pores of the part marked ‘ ’... Removed with water or hypotonic solution been shown in this experiment which plant can be considered as the of.. ) dissolved in it to the different parts of the stems of woody plants ICSE Biology 10... Make the guard cells increases during day time dotted arrow shows the path of.. Being studied of plant Life photosynthesis and for allowing transpiration. ) ) stomata by... 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