
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

ISC Class Prelims 2019 : Biology

5 pages, 6 questions, 0 questions with responses, 0 total responses,

	Isc	+Fave Message
	Profile Timeline Uploads

Home > grade10icse >

Formatting page ...

Full Marks- The Heritage School Pre Board Examination -2018-19 Subject -Biology paper I (Iheory) Class- XII 70 Downloaded from TestPaperz.com Time - 3 Hrs (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) This paper comprises of TWO PARTS- Port Answer All I and Part II. questions. z. co m Purt I contains twenty questions of one mark each. Part II consists of Section A, B & C. Section A contains seven questions of tuto morlcs each. Section B contains seven questions of thrce marlcs each, and Section C contains three questions ofJive marlcs each. Internal choices have been provided in two qaestions in Section A, two qaestions in Seetion B and in all three questions of Section C. er PART I (20 Marks) Question ap Answer all questions 1 tp (a)Answer the following questions briefly and to the point: [8x1] ht tp s: //t es (i) Name any two techniques that serve the purpose of early diagnosis of some bactenal / viral diseases. (ii) Name the Indian variety of rice patented by an American Company. Name the bacterium that was used as bio pesticide for the fust time. (iii) Mention two objectives of setting GEAC by our government. (iv)Name the cell organelle that help in the formation of acrosome. State the function of sertoli cells. (v) Give one significant difference between Primary and Secondary Productivity. (vi)How do algal bloom atTect the life in water bodies? (vii) How is primary succession different frorn secondary succession? (viii)What are hot spots? Name a lake in India that is considered as sacred lake. (b)Each of the following questions has four choices. Choose the best option in each case: [4x1J (i)Polar bodies are formed during: I.Spermatogenesis Iil.Fertiiization Il.Oogenesis IV.Cleavage This question paper consists of tive Downloaded from TestPaperz.com printed pages (ii) Evolutionary history of an organism is known as II. Phylogeny [V. Palaeontoiogy Downloaded from TestPaperz.com (iii)Which type of Plasmodium is infective to man? I,Trophozoite Il.Sporozoite IllGametocyte Stage IV. Cryptomerozoite (iv) Which of the following steps are catalysed by Taq Polymerase in PCR reaction? I.Denaturation of template DNA Il.Annealing of primers to template DNA Ill.Extension of primer on the template DNA IV.All of these I.Ontogeny III. Ancestry (d)Defi ne the follo*,ing (i)Capacitation (ii)Heterosis : [2x1] er reason: [4x1] m scientists: z. co (c)Give one significant contribution of each of the following (i) Temin and Baltimore (ii) R.Mishra (iii) T.H. Morgan (iv) P. Ehrlich ap (e)Give [2xU (i)Genetic code is degenerate and unambiguous. (ii) Retroviruses have no DNA; however DNA of the infected host cell does possess viral DNA--- State the reason. es tp PART II Section A (14 Marks) (Answer all questions) 2 I2l ht 3 tp s: //t Question a)i) How does cleistogamy ensures autogamy? State any one advantage and any one disadvantage of cleisto gamy. ii)Name the reproductive unit of Cltlamydomoncs sp. OR i)What do you mean by seasonal breeders. State any one example. ii)Expand RCH. State any one goal of the same. Question Write short notes on the following: i)Sparged Bioreactors ii) Down streaming process Question State any two points of difference between: i)Acute disease and Chronic Disease ii)Innate Immunity and A.cquired Immunity Question i)What is the main difference between Inbreeding and Outcrossing? ii)Expand the term FOAM and write a short note on the sarne. Question i)Name the parasite causing Filariasis in Human. Mention any two diagnostic symptoms the disease. Downloaded from TestPaperz.com IZI 4 I2l 5 IZI 6 lzt of Downloaded from TestPaperz.com Question 7 a)Explain the process of sex determination in Honey bees. OR b) Differentiate between i) Turner Syndrome and Dor,lt s-vndrome ii)Pieiotropy and Polygenic inheritance I2l Question 8 i)Study the fbllowing flow chafi. Name the horrnones involved at each stage. Hypothalamus t2l i v m Pituitary Testes i {/ er Sperms z. co I ap ii)What is self-incompatibility? tp Section B (21 N{arks) (Answer all questions) t3I Question 10 t3l tp ht -A s: //t es Question 9 a)State the characteristics of Secretory phase of a menstrual cycle" OR b)State the events happening during entry of sperm foilowed by activation of ovum. ft Identify the structure sho*n above. Label A, B and C. Write the chemical nature of an antibody. Name the cells that produce antibodies in humans. Question I I Briefly describe the technique employed in DNA finger printing. t3I Downloaded from TestPaperz.com Downloaded from TestPaperz.com Question 12 i)State the consequences of stratospheric Ozone depletion. ii)state any four measures to control pollution from automobile exhausts. Question 13 a) Eqllain the evolution of neck of giraffe according to Lamarck's theorl' of 13l t3l evolution. OR b) Explain the following tenns i) Aneuploidy ii) Codominance iii) Transversion t3I m Question 14 State and explain methods of endosperm formation. Draw. the related diagrams for each z. co process. t3l tp ap er Question 15 A flower of tomato plant. produce 240 viable seeds after sexual reproduction, Answer the following questions giving reasons: I]How many megaspore mother cells (MMC) ',r,ere involved in the process? IIJWhat is the minimum number of microspore cells involved in the abor,e case? iII]How many male gametes are involved? 16 es Section C (15 Marks) (Answer oll questions) ht tp s: //t Question t5l a)i)Explain the experiment conducted by Meselson and Stahl? What did they conclude from their experiment? ii) Give any two applications of HGP" iii) Sho'*'with the help of a graph what is the difference between directional and disruptive Natural selection? OR b)i)Explain the process of transcription in a prokaryotic cell. ii) State Hardy Weinberg's principle. 17 Question ISI a)i)Why are the colourful polystyrene and plastic packings used for protecting the food considered as an environmental menace? ii)Write about the remedy found for the efficient use of plastic waste by Ahmed Khan of Bangalore. iii)Explain any two causes for loss of biodiversity. Downloaded from TestPaperz.com OR b)i)Why are small animals rarely found in polar regions? Explain. Downloaded from TestPaperz.com ii)Explain Brood parasitism, iii)Our farmers still use DDT. Hou' is this affecting the local bird population? iv)what is photochemical smog? Horv does smog affects biological world? Question 18 tsl a)i) What are the two irnportant fealLlres a good cloning vector needs to have ? ii) What is the role played b,v EcoRi in recombinant DNA technology? What do co and R represent in this ? iii) What are Cry proteins? Name the organism that produces it. How man has exploited this protein to his benefir? OR b)i) write short notes on i)R.'\A inrerference ii) ELISA iii) Stem cells ii) FIow are anti-trypsin and golden rice useful to human beings? z. co m iii) What is Gel electrophoresis? ht tp s: //t es tp ap er Downloaded from TestPaperz.com

Formatting page ...

grade10icse chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: