www.asiriyar.com 10th Science MARK: 75

I ANSWER ALL THE QUESTIONS

TIME: 2 1/2 HOURS

15

X 1= 15

1) The inheritance of characteristics through generation is called ‘heredity’. In Mentel’s Pisum sativum plant, the genetic material present is______ a) DNA b) RNA c) Protein d) Cytoplasm 2) Which bacteria spread the disease of typhoid a) Plasmodium typhi b) Salmonella typhi c) Salmonella ovale d) Plasmodium ovale 3) _____ regulates iodine and sugar levels in blood. a) Thyroxine b) pituitary c) Adrenal d) Testis 4) The product of triple fusion which acts as nutritive tissue for the development of an embryo is a) Zygote b) Placenta c) Scutellum d) endosperm 5) _____ are concerned with blood clotting to prevent blood loss. a) Erythrocytes b) Leucocyts c) Thrombocytes d) plasma 6) Pick out the odd one: The parts of the alimentary canal are a) pharynx b) mouth c) buccal cavity d) pancreas 7) Compressed Natural Gas (CNG) is considered a better fuel than coal/petroleum, becuause _______ 8) ____ is an important fuel source for fertilizers a) coal b) petroleum c) natural gas d) all the above

www.asiriyar.com 9) 10) 11) 12) 13) 14) 15)

I n an e ndot her m i c pr oce ss , sol ubi l i t y i ncr ea se s wit h ____ i n t em per at ur e. ( i ncr ea se , dec r ea se ) H T he P v al ue of bl ood a) 7.7 b ) 7.0 c ) 7.6 d) 7.4 ____ i s us ed as a node f or Ele ct r ol y t i c Ref i ni ng . a) coppe r m et al b) i m pur e c opper m et al c ) coppe r sul phat e d ) I r on Whi ch one of t he f ol l ow i ng i s not f unct i onal g r oup? a) O H b) C O O H c) C H d) C H O Why does a f i el der i n t he g am e of cr i ck et pul l hi s ha nds ba ck w hen he ca t che s a bal l ? T he SI uni t of C har g e a) am per e b) coul om b c) ohm d ) v ol t H ow ca n an AC g ene r at or be c onv er t ed i nt o a DC g ene r at or ?

II ANSWER ANY TWENTY OF THE FOLLOWING QUESTIONS

20

X 2= 40

16) Who proposed the theory of Natural Selection? Mention the two principles of this theory. 17) What is meant by Genetic Engineering? 18) What are variations? Mention their types. 19) Name the tests done for the diagnosis and confirmation of AIDS 20) Copy and complete the following table.. Hormones of adenohypophysics Functions and malfunctions Thyrotropic or Thyroid stimulating hormone(TSH) It stimulates the growth of mammary glands in females and milk production after childbirth.

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21) a) Identify Fig A and B. b) Which part of A is modified in to B

22) Write any four differences between arteries and veins in mammals. 23) Fill in the blanks. valves Location Function Bicuspid valve or Mitral Prevents the backward flow valve of blood from left ventricle to left auricle. Aortic valve At the base of Aorta 24) Fill in the blanks. a) The heart is covered by ______ b) ____ are the structural and functional units of the kidney. 25) What is respiration? Give a balanced equation for aerobic respiration. 26) Write the equation of photosynthesis in the form of bio chemical reaction? 27) What is meant by Anaerobic Respiration? 28) What are the products produced by the process of Green chemistry? 29) Find the odd one out a) bio-alcohol, green dieses, bio – ethers, petroleum b) cholera, typhoid, scabies, dysentry 30) Table any three Renewable and Non – Renewable sources. 31) Which are the used as bio fuels? 32) Radha prepared a solution which could be separated by filtration. a) Name the type of solution. b) Is the solution transparent or opaque? 33) Find the concentration of solution in terms of weight percent if 20 m of common salt is dissolved in 40 gm of water. 34) Calculate the number of moles in 27.95 g of Iron. 35) Identify the wrong statements and correct them. a)Nitric acid is not used as fertilizer in agriculture. b) The PH of acid is greater than 7. 36) The hydroxide ion concentration of a solution is 1.0 X 10-9 M. What is the PH of the solution? 37) To design the body of an aircraft, aluminium alloys are used. Give reasons. 38) Write the oxide ores of Aluminium. 39) What is meany by Esterification? 40) Fill in the blanks. a) The value of Universal Gravitational constant (G)_______ b) The value of Acceleration due to gravity(g)________ 41) If the denstity of the earth is doubled to that of its original value., the radius remaining the same, what will be the change in acceleration due to gravity? 42) A potential difference 20 V is applied across a 4 Ω resistor. Find the amount of heat produced in one second. 43) A wire of resistance 8 Ω in bent into a circle. Find the resistance across the diameter.

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www.asiriyar.com 44) Write about ocean thermal energy? 45) Write the used of Concave mirror. 46) A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image 10 cm from the lens? 47) A 3 cm tall bulb is placed at a distance of 20 cm from a diverging lens having a focal length of 10.5 cm. Determine the distance of the image. III ANSWER ALL THE QUESTIONS

4

X 5= 20

(Write one question from each part) Part A 48) What is immunity? Write a note on the various types of immunity. 49) Describe the structure of a neuron with the help of a neat, labelled diagram. Part B 50) Describe the structure of a dicot seed. 51) We are surrounded by smoke. Is this situation good for our health. Give reason. Part C 52) How many grams are there in the following? a) 1 mole of chlorine molecule, Cl2 b) 2 moles of sulphur molecules, S8 c) 4 moles of ozone molecules, O3 d) 2 moles of nitrogen molecules, N 2 53) Homologous series predict the properties of the members of the series. Justify this statement through its characteristics.

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54) A bomb of mass 3 kg, initially at rest, explodes into two parts of 2 kg and 1 kg. The 2 kg mass travels with a velocity of 3m/s. At what velocity will the 1 kg mass travel? 55) The optical prescription of a pair of spectacle is Right eye: - 3.50 D Left eye: - 4.00 D a) Name the defect of the eye? b) Are these lenses thinner at the middle or at the edges? c) Which lens has a greater focal length?