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BIOLOGY PAPER

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Sahil Meher
St. Anne's Convent School (SACS), Sonepur, Subarnapur

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-- BIOLOGY SCIENCE Paper (Two hours -3 ) Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the.first 15 minutes. This time is to be speryt in reading the Question Paper. The time given at the head of this Paper is the time allowedfor writing the answers. Attempt all questions from Section I and anyfour questions from Section IL The intended marl<s for questions or par.ts of questions are given in brackets I J. SECTION I (40 Marks) Question (a) Attempt all questions from this Section I Name the following: (i) (ii) (iii) The part of the brain associated u'ith memory. The ear ossicle which is attached to the tympanum. The type of gene, which in the presence of a contrasting allele is not exPressed.,t,'11l,', i:, (iv) The hormone secreted by islets of langerhans. (v) The process of conversion of ADP into ATP during photosynthesis.. (b) I5l State the main function of the following: (i) (ii) Cerebrospinalfluid. Eustachian tube. (iii) Suspensory ligament of the eye. (iv) Sperm duct, (v) (c) Lenticels. tsl Copy and complete the following by hlling in the blanks 1 to 5 with appropriate words: The human femhte gonads are ovaries. A maturing egg in the ovary is present (1). As the egg grows larger, the follicle (2) enlarges and gets filled with a fluid and is now called the follicle. The process of releasing the egg from the ovary is called in a sac of cells called This paper consists of 10 printed pages. Tl4 523 @ Copyright reserved Turn Over (3). The ovum is picked up by the oviducal funnel and fertilization takes place in the fixed (a). In about a week the blastocyst gets in the endometrium of the uterus and this process is called (s). (d) tsl Given below are six sets with four terms each. In each set one term is odd and cannot be grouped in the same category to which the other three belong. Identify the odd one in each set and name the category to which the remaining three belong. The first one has been done as an example. Example: Calyx, Corolla, Stamens, Midrib Odd term: midrib Category: Parts of a flower. (i) (ii) (iii) (iv) ' (v) (e) Haemoglobin,Glucagon,Iodopsin,Rhodopsin. UrethraflJtetus. Urinary bladder, Ureter. '! Transpiration, Photosynthesis, Phagocytosis, Guttation. Cyon, Photon, Axon, Dendron. Oxytocin, lTr,lj5p-lactin, Progesterone. The figure given below represents an experimental set up with t5l a weighing machine to demonstrate a particular process in plants. The experimental set up was placed in bright sunlight. Study the diagram and answer the following questions: (i) Name the process intended for study. (ii) Define the above mentioned process. (iii) When the weight of the test tube (A & B) is taken before and after the experiment, what is observed? Give reasons to justify your observation inA&B. Tt4 523 (iv) What is the purpose of keeping the test tube B in the experimental set t5l up? (0 Match the items given in Column A with the most appropriate ones in Column B and rewrite the correct matching pairs from Column A and Column B: Sl. No. Column B Column A Pituitary gland Sulphur dioxide Seminiferous tubules 2. 4. 5. d. Testosterone Calcium Growth hormone Acid rain e. Sperms f. I Global warming Magnesium Hydathodes a. b. c. Clotting of blood Guttation o b' h. 1":. tsl (e) Choose the correct ans\^'er from the options given below: (i) Cretinism and Myxoedema are due to: A. B. C. D. (ii) HYPosecretion of thYroxin' ? Knee-jerk. Blinking of eyes due to strong light. Salivation at the sight of food. Sneezing when any irritant enters the nose. After mitotic cell division, .A. B. C. D. Tt4 523 Hyper secretion of growth hormone' Hlposecretion of growth hormone' which of the following is not a natural reflex action A. B. C. D. (iii) HYPer secretion of thYroxin 44 a female human cell will have: * xx chromosome. 44 + xy chromosome. 22+xchromosome. 22+ychromosome' Tum Over (iv) The antibiotic penicillin is obtained from: A. B. C. D. (v) Bacteria. Virus. Fungus. The site of maturation of human sperrns is the: A. B. C. D. (h) Protozoan. Seminiferous tubule. Interstitial cells. Epididymis. Prostate gland. tsl State the exact location of the following: (i) (ii),/ \./ Yiil (t-".I (v) Tricuspid valve. Amnion. Yellow spot. Seminal vesicle t-' , l. r. Adrenal '. gland. SECTION I t5l II (40 Marks) Attempt anyfour questions from this Section Question 2 (a) Differentiate between the following pairs on the basis of what is mentioned within brackets: , (i) (ii) 1\ Spinal nerves and Cranial nerves (Number of nerves). *:*'i'loll 3?,j'P:"11-s1,vi:j",;'r.-(*pre orthe eve lens) (iii) cBff,i:;:ri;,1- ""j'8;;J,i;;il ^(g+q1i*r (1ul Turgor pressure and wall pressure. (Explain) (v) ^DisinfectantandAntiseptic(Definition). . ,,' / f'\a,t1i!r$,.r::'i.n D u${Jr l Ittt'yrrr p^r.d'jure ruhBrr fr.'p ca-u n?rarh **re toorec Tt4 523 ttuat4- ond d\'Svcer.rv^.erl A% ot* ;nbi*u.. {-+-",u"' .t,lt, i e. *f'l" tsl *[e celr qcrov.sora s^o-rJ rs co.rra6 *ryT --- (b) The diagram below represents the simplified pathway of the circulation of . blood. Study the same and answer the questions that follow: SMALL INTESTINE (i) (ii) (iii) (iv) Name the blood vessels labelled I and 2. State the function of blood vessels labelled 5 and g. What is the importance of the blood vessel labelled 6? '' Which blood vessel will contain a high amount of glucose and amino acids after a meal? '.r ,/' (u),/ Draw a diagram blood. of the different blood cells as seen in a smear of human d- tsl Question 3 (a) A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 houts, in the first beakei" the potato cube increased in size, in the second beaker T14 523 Turn Over -------r no change in and in the third beaker there was the potato cube decreased in size same following diagram shows the result of the the size of the potato cube' The experiment: (i) (iD ilrzr*r*o,rr,.*t,. SIZE DECREASED SIZE INCREASED t solutions used in beakers- 1. 2 and 3' Give the technical terms of the remains the same. ExPlain the In beaker 3 the size of the potato cube reason in brief. (iii) Writethespecificfeatureofthecellsapofroothairswhichhelpsin absorPtion of water' (iv) What is osmosis? (v) How does a in their permeability? cell wall and a cell membrane differ (b) A potted plant was taken in order to prove a factor tsl necessaly for photosynthesis' ThepottedplantwaskeptinthedarkforZ4hours,oneoftheleaveswas coveredwithblackpapefinthecentre.Thepottedplantwasthenplacedin sunlight for a few hours' (i) What aspect of photosynthesis was being tested? (ii)Whywastheplantplacedinthedarkbeforebeginningtheexperiment? (iiD During the starch test wh'v* *'as the leaf - (1) boiled in water (2) boiled in methYlated sPirit' . (iv)Writeabalancedchemicalequationtolepresenttheprocessof . PhotosYnthesis' (v)Drawaneatdiagramofachloroplastandlabelitsparts. 6 Tl4 523 tsl Qrestion 4 (a) The diagram given below pertaining to the nervous is a representation of a certain phenomenon system. Study the 'diagram and answer the following questions: (i) \nrt rb nherrrrsrn ft4 is being depicted. G) Give the technical term for the point of contact between the two cells. (iiD Name the parts 1,2,3 and 4. (iv) Write the functions of parts 5 and 6. (v) How does the anangement of neurons in the spinal cord differ from that i lsl of the brain? O) Give scientific reasons for the following statements: (i) (ii) (iii) (iv) (v) Tt4 523 Use of C.F.C is banned in many countries; We cannot distinguish colours in moonlight Balsam plants wilt during midday even if the soil is well watered. earbon monoxide is highly dangerous when inhaled. A person after consuming alcohol walks clumsily. t5l Turn Over 5 -Question (a) Given below is a diagram representing a stage during mitotic cell division. Study it carefully and answer the questions that follou': (i) Is it a plant cell or an animal cell? Gir e a reason to supFort ) our 3ns\\.er. (rr) Identify the stage shown. (iii) Name the stage that follows the one shoun here. Hon is that *age identified? (iv) How will you differentiate between mitosis and meiosis on the basis of the chromosome number in the daughter cells? (v) (b) Draw a duplicated chromosome and label its parts. (i) Name the disease for which the following types of vaccines are given: (1) (2) (ii) Salk's Vaccine. - f+f ''' ,'' tsl ii ' B.c.G. Give one example of each of the following: (i) (2) A water pollutant. An aquatic plant used in the lab to demonstrate 02 liberation during photosynthesis. (3) (4) (iii) An antibiotic. A nitrogenous base in DNA. Expand the following biological abbreviations: (1) ArP (2) rsH (3) DPT *T-r;'-."..*' 1'ttI 'I (4) Tr4 523 DNA lsl Question 6 The given diagram represents a nephron and its blood supply. Study the (a) diagram and answer the following questions: rl (i) ,,. Label parts 1,2,3 and4. !11)"- -:State the reason for the high hydrostatic pressure in the glomerulus. ,' ,/iiii;.-"Name the blood vessel which contains the least amount of urea in this diagram. ) r (\') \-/ (ir (b) I \ame the two main stages of urine formation. 71flrne the part of the nephron which lies in the renal medulla. CtDr$scrqs' co.qsu\e tsl , Briefly explain the following terms: (i) monohybrid cross. (ii) Biomedical waste. {{n"ate immunity. tsl 9 Tt4 523 Tum Over 7 '\ Qucstion -.,' (a) (i) (ii) State any two harmful effects of noise pollution on human health. Categorize the following activities as per the functions of the Red Cross Society and the WHO: (1) (2) (3) @) (iii) (iv) (b) To suggest quarantine measures to prevent spread of disease. Humanitarian services to victims of war. To educate people in accident prevention To promote projects for research on disease. write any two major reasons for the population explosion in India. State Mendel's Law of segregation. isl Give technical terms for the following: (i) (ii) (iii) {iv) (v) , (:) (uii) '(viii) A method of contraception in which the sperm duct is cut and ligated. Statistical study of human population. The protective covering of the heart. A sudden heritable change in the gene. mU.}U}i OO Repeated units of DNA molecule. The fluid portion of blood. The nerve that transmits impulses from the ear to the brain. uu\\*s"ry Group of hormones which influence other endocrine glands to produce q oQn'\e hormones. f!") (x) Thin walled sac of skin that covers the testes. The permanent stoppage of the menstrual cycle in a woman aged 50 years. t5l l0 Tl4 523

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