» Class Xth Sample Question Papers : CBSE Sample Question Papers

Section - A

1. Name one gaseous fossil fuel.
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2. Complete the path of ray of light after reflection at the mirror in the given diagram ;
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3. Express one light year in terms oi’ SI unit of distance.
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4. Give an example of a photochemical reaction.
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5. An organic component is a constituent of beer, whisky and some cough syrup. It is produced by the fermentation of sugar. Identify the organic compound.
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6. Name any two Jovian Planets. Write their common features.
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7. A current carrying straight conductor is placed in east-west direction. What will be the direction of the force experienced by this conductor due to earth’s magnetic field ? How will this force get affected on: (a) reversing the direction of flow of current ? (b) doubling the magnitude of current ?
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8. How do we obtain information about the interior of earth ?
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9. What kind of energy transformation takes place in an electric motor ? Name any tv/o devices which use electric motor as an essential component in their working.
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10. Write the equilibrium constant expression for the following chemical reaction :
N₂(g) + O₂(g) = 2NO(g)
What does a very small value of K_c - 4.8 x 10^-31 for this reaction indicate ?
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11. An object of size 5 cm is placed at a distance of 25 cm from the pole of a concave mirror of radius of curvature 30 cm. Calculate the distance and size of the image so formed. What will be the nature of the image ?

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An object of size 3 cm is placed at a distance of 15 cm from a convex lens of focal length 10 cm. Calculate the distance and size of the image so formed. What will be the nature of the image ?
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12. Two electric lamps rated 100 W, 220 V and 25 W, 220 V are connected in parallel to a 220 V supply. Calculate the total electric current in the circuit.

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A metallic coil connected to a 220 V supply, has a resistance of 110 ohms (while hot). How long will it lake this coil to heat I kg of water from 20^°C to 70^°C? Assume that whole of heat produced by the coil is taken up by water. ( Sp. Heat capacity of water = 4186 J/kg^°C)
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13. Describe with chemical equations, what happens when : Carbon dioxide gas reacts with ammonical brine in Solvay process.
(ii) Bleaching powder is left exposed to the air containing carbondioxide gas.
(iii) A mixture of finely powdered sand and sodium carbonate is heated in a tank furnace.
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14. Give chemical tests to ;
(I) detect the presence of ethanol.
(ii) show that methanol contains an aldehyde group.
(iii) show a saponification reaction.
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15. An organic compound A having molecular formula C₂H₄O, reacts with sodium metal and evolves a gas B which readily catches fire. A also reacts with ethanol in the presence of concentrated sulphuric acid to form sweet smelling substance C used in making perfumes.
(i) Identify the compounds A, B and C.
(ii) Write balanced chemical equations to represent the conversion of :
(a) Compound A into Compound B
(b) Compound A into Compound C
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Section - A

1. What is the effect of an increase in temperature on the rate of a chemical reaction ?
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2. Name any two isotopes which readily undergo nuclear fission.
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3. Name the functional groups present in :
(a) CH,COOH
(b) CH,COCH,
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4. Why does it take longer to burn wet wood ?
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5. Why are Zirconium, Titanium and Chromium classified as strategic metals ?
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6. Define the terms:
(a) Astronomical Unit
(b) Light year
Give approximate value of each in SI units.
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7. Explain giving reasons :
(i) Tartaric acid is a component of baking powder used in making cakes.
(it) Gypsum, CaSO₄. 2H₂O is used in the manufacture of cement,
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8. Calculate the energy released ( in MeV) when 1 kg mass is completely converted into energy. (Take 1 MeV- 1.6 x l0^-13 J, C = 3,0 x 10⁸ ms^-1 )

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When Uranium undergoes fission, 0.1 % of the total mass is converted into energy. Calculate the total amount of energy released in Joules during an explosion of in atom bomb which contains 5 kg of Uranium.
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9. When a copper wire is left in silver nitrate solution, it is observed that the solution turns bluish green, (i) Explain this observation. (ii) Write the balanced chemical equation 10 represent the change taking place.
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10. State Right Hand Thumb rule to find the direction of the magnetic field around a current carrying straight conductor. How will this magnetic field be affected on ?
(a) increasing the current through the conductor ?
(b) changing the direction of flow of current in the conductor ?
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11. (a) Name the product formed when melhanol undergoes controlled oxidation.
(b) Describe with necessary chemical equations the lest you would perform to identify the above product.
© Name the compound formed when ethanoic acid reacts with ethanol in the presence of concentrated sulphuric acid.

OR
(a) Propanone can be manufactured from Cumene. Write the corresponding chemical equation.
(b) Name the compound formed when propanone is reduced. Which reducing agent is generally used in this process ?
© How is propanone converted to ethanoic acid ?
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12. Two identical resistors, each of resistance 10 ohms, are connected (/) in series (it) in parallel, in turn. to a battery of 6 volts. Calculate the ratio of power consumed in the combination of resistors in two cases.
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13. An aqueous solution has hydrogen ion concentration, [H + ] - 1.0 x 10^-10 mol L^-1
(a) Determine the pH of this solution.
(b) Is the solution acidic, basic or neutral?
© Will the pH of the above solution increase or decrease on adding a drop of 1M HCL to it ? Justify your answer.
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14. Draw a labelled diagram of a dry cell. Write the chemical equations involved
(i) at the anode
(it) at the cathode while the cell is working. 3
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15. Distinguish between polar and equatorial orbits of artificial satellites, Which of the above two orbits
is suitable for a (i) geostationary satellite (ii) satellite used for weather forecasting ?

OR
How do we locate the position of the pole star in the sky? Why is the pole star so special ? 3
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1. Give an example of a photochemical reaction.
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2. An organic component is a constituent of beer, whisky and some cough syrup. It is produced by the fermentation of sugar. Identify the organic compound.
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3. Write the equilibrium constant expression for the following chemical reaction:
N₂ (g) + O₂ (g) = 2 NO (g) What does a very small value of K_c = 4.8 x 10^-31 for this reaction indicate?
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4. Describe with chemical equations, what happens when,
(a) Carbon dioxide gas reacts with ammoniacal brine in Solvay process. (6) Bleaching powder is left exposed to the air containing carbon dioxide gas. © A mixture of finely powdered sand and sodium carbonate is heated in a tank furnace.
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5. Give Chemical tests to:
(a) detect the presence of ethanol.
(b) show that methanal contains an aldehyde group.
© show a saponification reaction.
Answer :

6. An organic compound A having molecular formula C₂H₄O₂ reacts with sodium metal and evolves a gas B which readily catches fire. A also reacts with ethanol in the presence of concentrated sulphuric acid to form sweet smelling substance C used in making perfumes.
(a) Identify the compounds A, B and C.
(b) Write balanced chemical equations to represent the conversion of:
(i) Compound A into Compound B (ii) Compound A into Compound C
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7. (a) Explain the role of the following in the extraction of Aluminium from
Bauxite ore: (i) Cryolite. (ii) Inside lining of graphite of the electrolyte tank
(b) Also draw a labelled diagram of the tank used in the electrolytic reduction of Alumina.
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8. Which two metals do not corrode easily? Give an example in each case to support that:
(a) Corrosion of some metals is an advantage.
(b) Corrosion of a metal is serious problem.
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9. (a) Name the sulphur compound present as an impurity in natural gas.
(b) What possible valencies are shown by sulphur in its compounds?
© Draw a labelled diagram of the Frasch process used in the extraction of sulphur.

Or
(a) Why is sulphuric acid called the ‘King of Chemicals’?
(b) Describe with chemical equations how is sulphuric acid manufactured by ‘Contact Process’. © Describe an activity to show that concentrated sulphuric acid is a powerful dehydrating agent.
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1. What is the effect of an increase in temperature on the rate of a chemical reaction?
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2. Name the functional groups present in:
(a) CH3COOH
(b) CH3COCH3
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3. Why are Zirconium, Titanium and Chromium classified as strategic metals?
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4. Explain giving reasons:
(a) Tartaric acid is a component of baking powder used in making cakes. (b) Gypsum, CaSO4.2H2O is used in the manufacture of cement.
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5. When a copper wire is left in silver nitrate solution, it is observed that the solution turns bluish green.
(a) Explain this observation.
(b) Write the balanced chemical equation to represent the change taking place.
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6. (a) Name the product formed when methanol undergoes controlled oxidation. (6) Describe with necessary chemical equations the test you would perform to identify the above product.
© Name the compound formed when ethanoic acid reacts with ethanol in the presence of concentrated sulphuric acid.

Or

(a) Propanone can be manufactured from Cumene. Write the corresponding chemical equation.
(b) Name the compound formed when propanone is reduced. Which reducing agent is generally used in this process?
© How is propanone converted to ethanoic acid?
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7. An aqueous solution has hydrogen ion concentration,
[H+] = 1.0 x 10-10 mol L-1
(a) Determine the pH of this solution.
(b) Is the solution acidic, basic or neutral?
© Will the pH of the above solution increase or decrease on adding a drop of 1M HC1 to it?
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8. (a) Draw a flow diagram illustrating the principle used in the manufacture of ammonia by Haber process.
(b) Describe an activity to show that ammonia is basic and is highly soluble in water.
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9. Explain giving reasons:
(a) Detergent made up of molecules in which branching is minimum are preferred these days.
(b) In the manufacture of condensation polymers, each monomer should have at least two reactive sites. Why? Cite an example to support your answer.
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10. Name the lightest element. Why is its presence in the free state in the earth’s atmosphere negligible? With a labelled diagram, describe how this element can be prepared in the laboratory. How is this element used in: (a) Space programmes
(b) Oil industry?

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(a) Name the chief ore of iron. How is it concentrated?
(b) Describe the extraction of iron from the concentrated ore with the help of
(i) a labelled diagram of the furnace used.
(ii) Necessary chemical equations representing the chemical changes occurring during the process.
© How is the conversion of iron into iron oxide prevented during the extraction of iron?
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1. Give two examples of monuments, which had to be transplanted to new areas because of submergence.
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2. How has the Ancient Monuments and Archaeological Sites and Remains Act of 1958 helped to preserve ancient historical monuments? Explain two points.
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3. Below are given in List A the names of different means of irrigation and in List B the percentages of net sown area irrigated by them. Write against each method of irrigation the relevant percentage area irrigated by it.
List A: (i) Canals; (ii) Other sources; (iii) Tanks and (iv) Tube wells and wells.
List B: 57%; 6%; 31% and 6%.
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4. How does the depletion of forests affect the eco-system? Explain two points. (2x1 = 2) J&.
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5. Since the land under pasture has reduced, what impact did it have on cattle rearing? Explain two points.
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6. Why is woollen textile industry concentrated in Northern India? Give two reasons.
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7. Where was the first cement plant set up in India? What is the reason for the fast expansion of cement industry in India?
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8. Why has the importance of telecom industry been increasing in recent days? Give two reasons.
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9. Explain the concept of sustainable economic development. Explain two points.
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10. Explain the two effects of increase in income on prices.
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11. Explain with example the meaning of disguised unemployment.
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12. What is the main focus of gender empowerment?
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13. Explain two effects of high rate of growth in population on unemployment in India.
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14. “India’s living heritage can be seen and felt in our every day life". Explain with four examples.
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15. Name and describe the two categories into which cultural heritage is divided. Give one example for each.

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Name any four rivers of India. What has been their contribution to our cultural heritage?
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16. Analyze any four factors which help in the formation of soils.
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17. Explain the two poverty alleviation programmes (with their nature and objectives) adopted by the Government of India.
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18. “Human Development is the essence of social development.” Explain any four points.
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1. What is a stupa? Name any two places where stupas are found.
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2. Why are dwelling places of Laddakh different from those of Kerala? Give two reasons.
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3. Land Use Percentage of Land
Forest 22.5
Net sown area 46.6
Fallow land 7.7
Land not available for cultivation 13.8
Land under pasture and tree crops 4.8
Culturable wastes 4.6
Total 100

Study the data given above carefully and answer the following questions:
(a) What percentage of land is devoted to each of the net sown area and fallow land?
(b) What is the main difference between the net sown area and fallow land?
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4. (i) What is a multipurpose river valley project?
(ii) Name the multipurpose river valley project built on river Mahanadi.
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5. What are the two main objectives of conserving resources?
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6. Give one point of similarity and one point of difference between magnetite and haematite.
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7. Why is solar energy more developed in Western India? Support your answer with one reason.
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8. How can increase in production affect price rise?
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9. Mention two steps taken by the government to alleviate poverty in rural areas.
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10. “Unity in diversity is the backbone or our national development.” Explain any two points briefly.
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11. Why should we not discriminate on the basis of caste? Give two reasons.
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12. Why has the Indian Constitution provided special safeguards for the minorities? Give two reasons.
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13. Study the diagram given below and answer the questions that follow:

(i) What is the contribution of coal in the installed capacity of electricity?
(ii) Why is the share of coal continuing to be the highest?
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14. How have trees and plants, birds and animals become a part of our rich cultural »A heritage? Explain one example for each.
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15. Name a palace each in Karnataka and Kerala. How are these palaces used in modern times?

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What are different types of funerary monuments? Describe any two of them with examples.
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1. Name the type of chromosomes in which the centromere is near the middle and the two arms are almost equal in length.
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2. Which organs in human body produce haploid cells through the division of diploid cells?
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3. Why do we categorise asbestosis as an occupational hazard?
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4. How is acid rain formed? Mention any one of its harmful effects other than the corrosion of monuments.
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5. Excessive nutrients in the sewage flowing into the water bodies may lead to the death of fishes and other aquatic animals. Why will it happen so?

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What is meant by the term ’sustainable development? Suggest any two ways to achieve it.
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6. Write the effect of sympathetic nervous system on the following: (i) Heart, (ii) Blood vessels, (Hi) Bronchi, (iv) Eyes, (v) Gastric secretion, and (vi) Urinary bladder.
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7. Define transpiration. How does transpiration help in upward movement of water from roots to leaves? Draw a diagram of the part of the leaf from which trans¬piration takes place.
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8. Why is blood circulation in human heart called double circulation? Explain briefly. How is ‘Pace maker’ helpful to a heart patient?
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9. Differentiate between breathing and respiration. Explain clearly how the air is inhaled and exhaled during breathing in humans.
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10. What are the two vital functions of the human kidney? Draw labelled diagram of human urinary system. Name the procedure used in the working of an artificial kidney.
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1. What is the name given to a set of unpaired chromosomes of an organism?
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2. What clue does the fossil Archeapteryx provide in regard to organic evolution?
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3. What is meant by ‘homologous organs’?
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4. Differentiate between biodegradable and non-biodegradable pollutants. Classify the following under the above two categories: DDT, paper, cotton cloth, plastics.
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5. Name any two organs that are homologous to human arm. To which category of organs would you place wings of birds and wings of insects?
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6. (a) Draw a labelled diagram of a Neuron. (6) Which part of the brain is responsible for
(i) Intelligence and memory. (ii) Adjustment of movement of posture?
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7. Name the types of sex chromosomes present in:
(i) Human male. (ii) Human female.
What will be the sex of the child produced if a sperm carrying ‘V chromosome fertilizes the egg? Name an insect in which similar type of sex determination takes place.
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8. Draw a labelled diagram of the longitudinal section of pistil of a flower. What will happen to the pollen of mango flower if it falls on the stigma of guava flower?
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9. Write the sequence of steps and processes in the primary and secondary treat¬ments of the sewage before it is passed into the final (tertiary) step.
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10. How do ii) temperature, (ii) water, and (iii) carbon dioxide affect the rate of photosynthesis? During which state of photosynthesis do the following occur:
(a) Synthesis of ATP and NADPH?
(b) Synthesis of Carbohydrates?
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