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INDIAN EDUCATION SOCIETY Orion (1CSE)Secondary IES (2024-25) VALUE ADDITION THROVON EDUCATION PRE-PRELIMINARY EXAMINATION Marks: 80 Date: 12/12/2024 Std: X Subject: BIOLOGY Time: 2 hours separately. the paper provided on written be must paper Answer tothis duringthe first 15 minutes. You will not be allowed to write the question paper. Thistime is to be spent in reading allowed for writing the answers time the is paper this of head The time given at the II. and anyfour questionsfrom PART []. brackets Attempt all questions from PARTIparts in of questions are given intended marks for questions or The This paper consists of 8 printed pages. PART I(40Marks) (Attempt allquestions) (Do the questions from the given options. Question 1 Select the correct answer to the correct answer only) () [15] not copy the question. Write attached to spindle fibres by their: At Metaphase, chromosomes are Centromeres b) Satellites c) Secondary constrictions d) Kinetochores (i) normal visioned man, their sons will be If a colorblind woman marries a a) All normal visioned b) One-half colourblind and one-half normal normal c) Three-fourths colourblind and one-fourth d Allcolourblind (ii) What occurs duringaeplasmolysis? 1) Water leaves the cellcausing shrinkage. 2) Water enters the cell causing it to swell. 3) The cell wall collapses. 4) The protoplasm detaches from the cell wall. a) Statements 1) and 2) correct b) 1), 2) and 3) correct e Only 2) correct d) Only 1) correct Page 1 of 8 the day. (iV) ASSertion (A): The process of transpiration occurs only during lenticels. Keason (R): Itoccurs through stomata, cuticles and ay Both Assertion and Reason are true b) Both Assertion and Reason are false c) Assertion is true and Reason is false d) Assertion is false and Reason is true (v) Which of these factors does not affect the rate of photosynthesis? a) CO2 concentration b Light intensity c) Temperature d) Wind velocity (vi) Global warming can be controlled by 1. Reduced deforestation 2. Reduced forestation 3. Cutting down the use of fossil fuels 4. Increasing the use of fossil fuels a) Only 4 is correct b) Both 2 and 4 are correct. c) 2,3 and 4 are correct 1and 3 are correct (vii) Which one of the following pairs, is not correctly matched? a) IAA -Cell wall elongation bY Abscisicacid -Stomatal closure c) Gibberellic acid -Leaf fall G Cytokinin- Cell division (vii) Assertion (A) An artificial pacemaker can replace the SA node of heart. Reason (R) An artificial pacemaker is capable of stimulating the heart electricaly to maintain its beat. a Both Assertion and Reason are true b) Both Assertion and Reason are false c) Assertion is true and Reason is false d) Assetion is false and Reason is true (ix) The transparent lens the human eye is held in its place by a) smooth muscles attached to the iris b) ligaments attached to the iris ligaments attached to the ciliary body d) smooth muscles attached to the ciliary body Page 2 of 8 (X) Removal of proximal convoluted tubule from the nephron will result in: a) More concentrated urine No change in quality and quantity of urine c) No urine formation d) More diluted urine (Xi) Assertion(A): Ear drum plays an important role in vision. Reason(R): Eardrum receives the vibrations from the auditory canal and transmits them to the ear ossicles. a) Both Aand R true bY BothAand R false c) A is true R is false dA is false Ris true (xii) The site of maturation of human sperms is the a) Seminiferous tubule b) Jnterstitial cells ef Epididymis d) Vagina (xiii) Choose the correct functions of amniotic fluid: a) It acts as a shock absorber. b) Itsupplies nutrients to the foetus. C) lt supports the foetus and allows it to turn. e) Allof these (xiv) The posterior pituitary stores and releases: a) Growth hormone and prolactin. b) Prolactin and oxytocin. c) Oxytocin and antidiuretic hormone (ADH). d) ADH and growth hormone. (xv) Assertion(A): Alosomes determines the sex of an individual Reason (R): Autosomes are responsible for the female sex a) Both A and R true b) Both A and R false cY Ais true R is false d) A is false R is true Question 2 (i) (5] Name the following: a) Statistical _tudy of human population. b) First man like ancestor. c) A fuel in vehicle which. reduces pollution. d) The structure which connects the placenta and the foetus. e) Hormone which promotes growth of tendril arounda support. Page 3 of 8 Question 3 () (ii) Expand: LH. Aperson has Based on thesebeen PART II(40 Marks) (Attempt any four questions) experiencing excessive thirst and frequent from? Discuss how symptoms, the which endocrine (ii) symptoms. Name the hormone a) (iv) (V) the Regulates functioning of testes b) muscles increases blood supply to the Imagine you in the early 20th moth (Biston are a scientist in an century studying the peppered betularia) area of England. significant increase in the population industrialized Youobserve a of moths. dark-coloured Explain the reason for the above stated observation. is Rohan in a library studying for his exams. He can without any issues, but the text in his he struggles to see the titles read that are severalfeet of books on the book away. shelves a) Name the defect of the eye Rohan is b) State any one suffering from. reason for C) Question 4 () (ii) he may be urination. malfunction of specificdisorder suffering hormones contributes to these that What lens can be used to The diagram alongside represents a surgical sterilisation method in male. Study the same andanswer the questions that follow: b) c) Name the surgical method represented in the diagram. How does this method ensure birth control? Name the corresponding surgical method conducted on female. (2 2 [3] correct the defect? Name the pigment present in the The gland called X is made up cones of an eye. of two parts A and B, which substances. PartA secretes a hormone. On the basis of thissecrete different explain why gland X acts as both information, endocrine and exocrine gland. a [2] the above defect. (ii) State the function of each of the following. a) Semi Circular canal cells (iv) Explain: Sometime medicine droppedb)inLeydig the eyes flows into the nose. (v) (1] 2 [1] [2] (2] (3] Question 5 (0) (ii) [1] Name the 3 layers of meninges. Onwhich day of the menstrual cycle does ovulation take place,and which two l4 hormones promote the release of the ovum? (ii) Imagine you are walking in a park when you suddenly encounter a barking dog 2I that seems aggressive. State the immediate physiological responses mediated by the sympathetic nervous system on your heart and on the pupil of the eye. (iv) Inpea plants, the trait for yellow seeds (Y) is dominant over the trait for green [2] seeds (y). Consider two heterozygous pea plants (Yy) being crossed with each other. a) Write the phenotypic ratio of the offspring. 9 y79 b) What willthe genotypic ratio of the offspring be? (v) Given beloware diagrams showing the different stages in the process of fertilization of an egg in the human female reproductive tract. [3] a) Arrange the letter's given below each (A) diagram in a logical sequence to (8) show the correct order in the process of fertilization. b) Mention the chromosome number of the egg and zygote in humans. (C) (D) c) Where does fertilization normally take place? Question 6 (0) What is photolysis of water? [1] (ii) Why is DDT banned for use in many developed countries? [21 (ii) Ravi spends a day at the beach under the bright sunlight. When he returns home and enters his dimly lit livingroom, he initially finds it hard to see anything clearly. After about 15 minutes, he notices that his vision improves significantly. a) Name the kind of adaptation that occurs in Ravi's eyes. b) What is the effect on the Pupil of his eye and why? Page 6 of 8 [2] (iv) A different concentrations of sugar solutions horticulturist with carrot cells isto experimenting observe the effects on a concentrated sugar solution and notes the changes. a) What the b) observable sugar change concentrated What occurs in the carrot cells after being placed in solution? happens to the cell membrane during the above mentioned process? (v) The image given alongside represents a man with one of the hormonal disorder. Study the same and answer the following questions a) ldentify the condition shown in the diagram and name its most common cause. b) Question 7 (2 on cell structure. She places carrot slices [31 What are the other two clinical observed in such a person? symptoms that will be (i) Give names of the male (0) Priya is preparing for heraccessory reproductive glands Mathematics exam bysolving complex equations. of the braindoes Priya uses to solve Mathematics problemsS? [1] [2] (iV) The biosynthetic phase light directly. Comment. occurs in the hloroplast stroma and does not require (v) Observe the picture and answer the following questions. [2] a) What part (ii) b) Trace the nervous pathway using the following Muscles of the hand, Sensory nerves, Fingertips, Motorterms: nerves, and Brain. Give any two features of Neanderthals a) The give picture principle? [2) [3] indicates which b) Explain the principle. c) What is the meaning of acquired characteristics? Page 7 of 8 Question 8 () Write any one function of Lymph. (") Howdoes the following factors increases the rate of photosynthesIS? a) Thinness of the leaf b) More numerous stomata (ii) State the law of independent assortment. (iv) During a field trip to a botanical garden, Alex observed several small herbaceous plants exhibitingdroplets of water at the tips of their leaves inthe [1] [2] [21 early moning. Explain how this process occurs and the conditions under which it typically takes place. (V) Draw a neat labelled diagram to show the structural difference between artery and vein. kkkk** Page 8 of 8 (3]
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