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ICSE Class X Prelims 2025 : Biology (St. Josephs College (SJC), )

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Deccan International 2024-25 ICSE School High School First Pre Board Subject: Biology Maximum Marks: 80 Date: 13/12/2024 Duration: Grade: 10 ICSE Roll no. : Name: Pabnika -lyRao: 1. 2. 3. 4. 5. 6. 2 hour Answer all questions on a separate ruled paper. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. writing the answers. The time given at the head of this paper is the time allowed for Section B from Attempt all questions from Section Aand answer any four brackets. The intended marks for questions or parts of questions are given in Section A- (40marks) Question 1 [15] a.Choose the correct option from the following statements: chromosomes. iThe diagram shows the cell of an organism. The nucleus contains 12 After this cell divides by mitosis , how many chromosomes would be present in one of the daughter cells? A. 6 B. 12. C. 18. D. 24 the cell membrane . Red blood cells were placed in pure water. Movement of water across caused a change in the appearance. What caused this change in the appearance? A D Direction of water From higher to lower movement water potential From lower to higher water potential Into cells yes no Into cells no yes Out of cells yes Out of cells no 1 yes 2024-25 ICSE They have two Kii. A man marries a woman who has a different blo0d group from him. different blood and children. The children have different blood groups from each other group? blood parents' groups from their parents. What are the genotypes of the IPB D.IATP and [ o A. IAJA and IPB B. I^J^ and I jo C. I^TB and i . The diagram shows a mnammalian embryo, shortly after fertilization. Which is the correct description of these cells? A.Gametes undergoing meiosis B. Gametes undergoing mitosis C.Stem cells undergoing meiosis D.Stem cells undergoing mitosis X.Which of the following pair is correct? A. Transpiration- hydathodes B. Palisade parenchyma - glucose synthesis C. Xylem- translocation of starch D.Muslin cloth- semipermeable The reaction- O3 A02+ 0) The pollutant X is A. Carbon dioxide B. Oxides of Nitrogen C. Methane D. Chlorofluorocarbon sHThepart of sperm which facilitates entry of sperm into the ovum is - A.Lysozyme B. Acrosome C. Mitochondria D.Lysosome jiSclecttthe incorrect match of trait studied by Mendel and its dominant expression Trait of pea plant Dominantexpression A. Podcolour B. Flower colour Green C. Seed colour Green D. Seed shape Round Violet 2 ICSE jx.Given below 2024-25 is a schematic representation of blood flow from mother to foetus and vice versa. Study the same and choose the correct labelling part. CO, and other waste 3 products Oxygen, food and watar MOTH ER Embryo Oxygen, food and water CO, and other waste producis 4 The correct labelling parts is A. 1-Umbilical artery 2- Uterine vein 3- Umbilical vein 4- Uterine artery 5-Placenta 6- Umbilical cord B. 1-Umbilical artery 2-Umbilical vein 3- Uterine artery 4- Uterine vein 5- Placenta 6- Umbilical cord C. 1-Uterine vein 2- Placenta 3- Umbilical artery 4- Umbilical vein 5- Uterine artery 6- Umbilical cord D. 1-Umbilical vein 2- Uterine artery 3- Uterine vein 4- Umbilical artery 5-Umbilical cord 6- Placenta K Given below are the events of Photosynthesis. Identify which of the following is/are not true and select the correct option. LAbsorption of light energy by chlorophyll 2.The assimilatory power in the form ofNADPH and ATP are produced during the dark phase. 3. Reduction of carbon dioxide to carbohydrates 4.Conversion of chemical energy toradiant energy and splitting of water molecules into hydrogen and oxygen A. land 2 only B. 2 only C. 2 and 3 only D. 2 and 4 only 3 2024-25 ICSE Mi.The diagram shows the muscle that regulates the size of the pupil in an eye. iris circular muscles. radial muscles pupil How dothe muscles make the pupil smaller? Circular muscles Radial muscles A Contract Contract B Contract Relax C Relax Contract D Relax Relax a.Sickle cell anaemia is an inherited condition caused by a recessive allele 'a'. 'A' is the dominant allele for the normal condition. Study the given pedigree chart and identify the genotypes of individuals R and S H R S A. AA AA B. AA Aa C. Aa Aa D. aa Key: O- Normal Female D.Normal Male Affected female -Affected male 4 ICSE 2024-25 xjn.Pulse wave is caused by A. Systole of Atria C. Systole of right ventricle B. Diastole of Atria D. Systole of left ventricle v.Assertion :Rate of transpiration is maximum in awel- watered wilted herbaceous plant Reason : Flaccidity of guard cells causes partial closure of stomata A. Assertion is false, Reason is true B. Assertion is true, Reason is false C. Both Assertion and Reason are false assertion D. Both Assertion and Reason are true and Reason is the correct explanation for W. Assertion: Blood serum can clot Reason: Blood serum lacks Prothrombin assertion A.Both Assertion and Reason are true and Reason is the correct explanation for explanation for assertion B.Both Assertion and Reason are true and Reason is not the correct C. Assertion is true, Reason is false D. Assertion is false, Reason is true Question 2 a. Give reason for the following: [3] u foetus respires but does not breathe. ii.Person suffering from sore throat should gargle with lukewarm salt water. m.A person salivates on seeing delicious food. b.The picture below shows various human ancestors. Study the picture carefully and answer the questions: A D B i.In each case write the letter assigned and name the human ancestor whose features are described below. t Had cranial capacity of 600cc C 2 Exhibited absolute bipedalism, had heavy muscular, inhabitants of western Europe. 3. Walked fully upright and was the first to use fire. t Lacked eyebrow ridges, had well developed chin and was swift footed A 5 2024-25 ICSE evolutionary 1.Man and present day apes had a common ancestor. Mention two major differentiated them changes that occurred in the ape-like ancestor of humans that from apes c. Given below are incorrect statements. Rewrite the following correct statements. [5] NThe Homo sapiens is believed to have arisen from the main Homoerectus population and developed into Homo habilis. Sunken stomata are observed in Banana leaves. n.Circulation of blood from heart to body tissues and back to heart is called Pulmonary circulation. G< Variegatedplants show slower growth than the other plants because they have less chlorophyll means less food to the plant. Theshortest phase of the menstrual cycle is Follicular phase d. Given below is the diagram of apart of the female reproductive system showing the process X. Study the same and answer the following questions: Biood [81 -3 VESsels -2 4 P iabel the diagram 1,2,3 and4 ctDefine the process X. u .NameP. How is it formed and also state its function? iv. Given below are the different stages in fertilization of the ovum. D HUsing the letters given, arrange the stages in correct sequential order as they would have taken place. 2Where does this process take place in the reproductive system? 6 ICSE 2024-25 Which type of cell division forms O and what is its chromosome number? AWhich of the above figure is in diploid condition? . What happens in the female reproductive system if fertilization fails to occur? e. Arrange the following terms in logical sequence. Water molecules, oxygen, grana, hydrogen and hydroxyl ion, photons, chlorophyll 14] t. Motor neuron, hot pan, biceps contracts, sensory neuron, association neuron jPalisade cells, root hair cells, Endodermis, Stem Xvlem, Root cortex, Water and minerals, Root Xylem, Veins . Karyokinesis, S- phase,Cytokinesis, Gl phase, G2 phase Section B (40 marks) Attempt any four of the following Question 3 a.Given below is the diagram of a dicot root as seen in the transverse section. Study the [6] same and answer the following questions: ALabel the parts numbered 1-4 Drawaneat labelled diagram of part labeled Q as it would appear if excessive fertilizers are added to soil. iii.Define: he process responsible for passage of water molecules from A toB. Z. the pressure responsible for movement of water molecules in the direction indicated by arrows 7 2024-25 ICSE human foetus in the womb. Study the same b. The diagram below is that of a developing 14] and answer the questions that follow: -6 5 -X Label the parts numbered 1-6 wiZtate any two function of X Question 4 a. Given below is a schematic diagram of the section of a leaf showing the occurrence of aphysiological process. Study the same and answer the following questions: P -2 -3 P 1 i. Label the parts numbered 1 to 4 i. Name the substance whose movement is indicated by P ii. Mention the process by which the named substance moves as indicated by 1-Thick arrow 2-Thin arrow 3- Dotted arrow iv. Draw a neat labelled diagram of part labelled 4 as seen at 5 a.m. [5] ICSE 2024-25 b. The diagram given below shows a schematic representation of the three chambers of a part of the inner ear. Partlabelled 1is the vestibular canal. Study the same and [5] answer the following questions: 2 i. Label the parts numbered 2 to 6 ii. Name the fluid present in part labelled 1 ii. State the function of part labelled 7 and P iv. State the function of ear ossicles present in the middle ear cavity. Question 5 and its associated partsinthe a.Given below is the diagram of male reproductive system (71 human body. Study the sameand answer the following questions: R -P -1 -3 -X -4 Label the parts 1-4 HWhat is the significance of the human testes being located in scrotal sacs outside the abdomen? State the function of part labelled R, P and X j State the location of part labelled 1 and 2 2024-25 ICSE Drawa neat labeled diagram of human sperm rExplain the surgical methodof contraception for males. b.Answer the following questions. HExplain any two reasons for the increase of (3] population in India. wWhat are IUDs? n Explainany two-barrier methods of contraception. Question 6 a.Study the diagram of the section of spinal cord given below and uState the location of the spinal answer the questions: (5] cord. AName the phenomenon shown above. Label the parts 1-6 iv.What effect does the sympathetic nervous system have on: HPupil of the eye 2Heart b. Given below is a diagram of a cell in a particular phase of mitotic cell division. Mdentify and name the phase of the cell division shown. Give one reason to support your answer cbraw a neat labelled diagram of the above cell in the next phase. 10 (5] ICSE 2024-25 iMention two differences between plant and animal cell with i w Where in the plant body does mitotic cell division respect to mitosis occur? Differentiate between Anaphase of mitosis and Anaphase 1 of meiosis. Question7 a.The diagram given represents the human heart. Study the same and answer the questions: 14] 1 4 Label the parts numbered 1-6 ADraw a neat labelled diagram ofX as seen in the Transverse section. [3] b. Answer the following questions: What is a monohybrid cross? An a certain species of animal, Black fur (B) is dominant over brown fur (b). Predict the genotype and phenotype of the offspring when both the parents are heterozygous black fur ur Define the law of Mendel applicable to the above example. cComplete the following table. Do not copy the table. Write only the blank numbers (3] along with your answer: Function Organ / Hormone 1 Regulates basal metabolism Ethylene 2 Pons 3 4 5 Break dormancy of seeds and buds inhibits seed germination Glucagon 6 11

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