Question 14: “A higher rate of transpiration is recorded on a windy day rather than on a calm day.” Explain. The paper which is used to show loss of water through stoma of a leaf. A plant having sunken stomata. All the other three terms are concerned with processes in plants. Transpiration is the loss of water in the form of water vapours from the aerial parts of the plant. All rights reserved. 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. Therefore, to prevent wilting they require excess 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. 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 7: Forest bring in the rain, transpiration is the cause. (iv) Gives rigidity and protection to the cell. Method:- Prepare a list of students having free or attached ear lobes and calculate the percentage of students having each. (ii) Give the function of thick cuticle layer in desert plants. It protects the surface and reduces water loss. Present in the epidermis of green, aerial parts of plants, especially the leaves. Explain the term transpiration. (iv) It helps in ascent of sap in 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. In which beaker would you expect the greatest decrease in weight? Question 2: Name the three types of transpiration. 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. Guttation 8. 11. Inner wall of guard cells, 3. Answer: (i) It results in ascent of sap by creating a suction force. Chloroplast, 2. Question 6: Study the diagram given alongside and answer the questions that follow: (i) Explain the physiological process being study. 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. The process of getting rid of excess water in the form of water vapour through the stomata. Lenticels 4. Answer: Question 2: Transpiration and Evaporation. Spongy parenchyma, 5. Question 3: What is meant by the term transpiration stream ? (a) Loss of water vapours due to transpiration. 3. (iv) It is used to adjust the position of air bubble in graduated capillary tube. 6. *Lenticular transpiration is the type of transpiration which occurs through the small pores called as lenticels present in the bark. It is used for the process of osmosis as semi- permeable membrane. Guard cell of stoma. The 10% of the atmospheric moisture is contributed by the transpiration whereas the rest of … (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. This is the currently selected item. (vii) Five. (ii) A plant with sunken stomata. 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. Roots consume some amount of water from the soil and the rest evaporates in the atmosphere. Answer: 1. Transpiration is the loss of water in the form of water vapours from the aerial parts of the plant.. The ends of the cups were closed with corks through which two mercury manometers were connected. (False, Moist cobalt chloride paper turns pink in colour.) Hence, the guard cells become turgid and bulge outward due to their thin outer wall, thus widening the stomatal opening lying in between (Fig. Intro to vascular tissues (xylem & phloem) Xylem & transpiration . Science Class 10 Biology (India) Life processes Transportation in plants. Stoma. Practice: Transportation in plants. Question 3: Given below are the diagrams of a certain structure in plants in two conditions. (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. Transpiration is very important for maintaining moisture conditions in the environment. Question 5: The figure given below represents an experimental set up with a weighing machine to demonstrate a particular process in plants. The pH of the guard cells increases during day time. On windy day level of water decreases very quickly. The experimental set up was placed in bright sunlight. The substances which check the rate of transpiration. This water deficiency in cells cause them to loose turgidity and the plants wilt. (ii) What is the biological term for the above structure? Answer: Question 7: Stomata and Hydathodes. In human beings, the various organs associated with this system include the heart, lungs, blood vessels, capillaries, and blood.. Through these lenticels, gaseous exchange occurs between the soil and inner living cells. (v) Loss of water as water vapour from the aerial parts of the plant. 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. (ii) Mention one limitation of this apparatus. (ii) Lenticular transpiration. They are covered with a protective layer of dead calls having tiny openings called lenticels. So more water is lost than absorbed. Understand transpiration in plants with TopperLearning’s ICSE Class 10 Biology – Transpiration – Transpiration study resources. Answer: (a) Light intensity: It increases or decreases the rate of transpiration. 4. Transpiration is the process of water loss from leaves of plants through stomata. (I) A (ii) B (iii) C (iv) D (v) E V. The difference of weight would b maximum between: (i) A and B (ii) A and C (iii) A and D (iv) A and E (v) D and E Answer: I. No water drops will appear in the bell jar. It is considered as the essential evaporation of water through the leaves. A). Question 2: The figure below represents the vertical section of a leaf: (i) Name the parts labeled 1 to 5. 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. Lower side 4. Transpiration in plants is a crucial process. Guttation is defined as the loss of water in the form of water droplets from the leaves of intact plants. After a few minutes the cohalt chloride paper shows change in colour from blue to pink. Upper epidermis, 3. Transpiration involves mainly the xylem cells which become active during absorption process by the roots. Caused by … (True) 6. 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. Answer: Guard cells regulate opening and closing of stomata thus, control gas exchange and transpiration. Loss of water in the form of vapour from aerial parts of the plant. These are located on the stems of woody plants. (iv) The opening and dosing mechanism of stomata is regulated by the amount of water and solutes present in the guard cells. 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. Loss of water as droplets through leaves of an intact plant. It causes around 20% of transpiration in plants. Next lesson. 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. These are tiny pores present in the epidermis of leaf or stem through which gaseous exchange and transpiration occur. Answer: (1) A—Guard cell B—Stoma. BOOK FREE CLASS Question 9: The apparatus shown here is Girreau’s poto-meter designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Answer: Question 8: Guttation and Bleeding. (iii) Transpiration is the loss of water in the form of water vapor through the aerial parts of the plant. Silicon emulsions/phenyl mercuric acetate 8. 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. Answer: (i) Stomatal transpiration. A thick layer of cuticle on the leaf surface help to decrease transpiration. Intro to vascular tissues (xylem & phloem) Xylem & transpiration . Answer: On a hot sunny day, the rate of transpiration exceeds the rate of water absorption by roots. Lenticular 4. In bright sunlight the level of water decreases quickly. Loss of water from the surface of the water bodies in the form of vapour. Answer: (i) Transpiration: Loss of water as water vapour from aerial parts of the plant. (iv) Transpiration is the loss of water in the form of water vapour from the aerial parts of the living plants. 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. Answer: Question 3: Stomata and Lenticels. What does the xylem transport in a plant? The escape of plant sap from the ruptured or cut surfaces of the plant due to root pressure. It is a physical change controlled by the temperature and humidity of the atmosphere. (ii) What do the two arrows (dotted and solid) indicate in the day time and at night ? 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. 3. Question 16: Describe an experiment to prove that transpiration occurs more from the under surface of dorsiventral leaves. Next lesson. Cuticular transpiration 3. Stomata, Cuticle, Lenticels, Hydathodes. 1 Mark Questions Answer : Lenticels help in facilitating the process of transpiration in woody plants. CBSE Class 10 Biology Activity Chapter :Heredity and Evolution Activity 1:- Observe the ears of all the students in the class. More than 10% of the earth’s moisture is from transpiration. 95% of the total transpiration takes place through Stomata. It takes place through the skin. The polymer is composed of long-chain epoxy fatty acids, attached via ester linkages. (iv) The oil has been put in each test-tube to prevent the loss of water by evaporation. ICSE Class 10 Biology Transpiration Understand transpiration in plants with TopperLearning’s ICSE Class 10 Biology – Transpiration – Transpiration study resources. Transpiration: Occurs early morning and at night. 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: Question: 1. (b) Humidity of the atmosphere. (v) State the purpose of setting up test tube B. This force helps in the upward movement of water into the xylem vessels. 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. (ii) It lowers the rate of transpiration thus conserving water. Question 3: Young plants will an a hot sunny day. Transpiration is the process in which plants release the water inside it in the form of moisture or water vapor. A transpiration pull could be simply defined as a biological process in which the force of pulling is produced inside the xylem tissue. Cuticle, 2. 6. The water in each beaker was covered with a layer of oil. (iii) Could you add one more arrow in the figure ? (iii) The fall in the level of water in test-tube A due to the absorption of water by the roots. (v) The movement of air bubble in graduated tube in a minute gives the rate of transpiration. (i) These are located on the lower surface of dicot leaves and both upper and lower surfaces of monocot leaves. Eg. (iv) Water escapes in the form of water vapour. Download Formulae Handbook For ICSE Class 9 and 10. Main function of lenticel. (vi) The above structure helps in the process of transpiration. Question 8: Given below is the diagram of an experimental set up to study the process of transpiration in plants. Answer: Wind causes faster movement of air and remove the moist air and faster evaporation of water and therefore higher rate of transpiration. 10. Bleeding, Question: 1. Answer: (i) Transpiration. 3. Xerophyte 7. It is known to be a part of the water cycle. Transpiration is best defined as (a) loss of water by the plant (b) evaporation of water from the aerial surfaces of a plant (c) loss of water, as water vapour, by a plant Write the correct answer out of the five available choices given under each question: I. Answer: The three conditions which affect transpiration are the following : Question 12: What are the advantages of transpiration to the plant ? The upper surface has less stomata than the lower surface. Question 1: Transplanting of seedlings to flowerbed in the evening is better than doing so in the morning. Study the same and then answer the questions that follow: (i) What is the colour of dry cobalt chloride paper? (ii) Name the parts numbered 1-5. 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. Study class 10 notes & practice ICSE board sample papers to score high in exams. Answer: (i) Transpiration. Question 2: Land plants die if their foots remain water logged. Mention, if the following statements are True or False. Present on the edges and tips of leaves of many plants. Answer: (i) The guard cells are located in the leaves. (False, It occurs through hydathodes.). (d) Stop growing and gradually die of starvation, 5. Darwin’s potometer 10. (False, Cobalt chloride paper is used to demonstrate transpiration.) 7. Phloem & translocation. Potometer is an instrument, used for measuring the rate of transpiration. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’. Guttation 6. Most of the water a plant absorbs is not used for a plant’s daily functioning. Biological term for the process of getting rid of excess water will get accumulated in the rain, is... Aerial organs of the plant a physical process controlled by both internal and external.. To prove that transpiration occurs from the aerial organs of the plant surrounding structure! 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