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ICSE Class X Prelims 2025 : Biology (Vibgyor High School, Airoli, Navi Mumbai)

11 pages, 74 questions, 39 questions with responses, 48 total responses,

Shashwat Srivastava
Vibgyor High School, Airoli, Navi Mumbai
Grade 2 - Grade 10

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VIBGYOR HIGH Sample Paper BIOLOGY Grade: X Max. Marks: 80 Date: dd/mm/yyyy Time Allowed: 2 hour INSTRUCTIONS: 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 spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. The intended marks for the questions or parts of questions are given alongside the questions. Section A is compulsory. Attempt any four questions from Section B. This question paper contains 11 printed pages. SECTION A (40 marks) Attempt all questions from this Section Question 1 [15] Select the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only): i) Spindle fibers get attached to the centromere of the chromosome in the following stage: a) Telophase b) Anaphase c) Prophase d) Metaphase 1 ii) iii) iv) v) In a human female, ovum consists of: a) 23 pair of autosomes. b) 22 pair of autosomes and 1 pair of sex chromosomes. c) 22 autosomes and 1 X-chromosome. d) 22 autosomes and 1 Y-chromosome. In which of the following meiosis takes place? a) Pollen grains b) Anther c) Skin cells d) Liver cells A solid spherical mass of cells, resulting from repeated division of zygote. a) Foetus b) Blastocyst c) Morula d) Embryo Which of these characteristics is related to suitability of the roots for absorption of water? i) Tremendous surface area. ii) Contain cell sap at a higher concentration than the surrounding soil water. iii) Thin cell wall of root hairs. iv) Downward growth of roots in the soil. Choose the correct option vi) a) i) and iv) only. b) ii) and iii) only. c) i), ii) and iii) only. d) i) and iii) only. Sanjana found that there is a decrease in atmospheric pressure. Based on 2 this, the rate of transpiration will: vii) viii) a) Increase b) Remain the same c) Decrease d) None of the above Transpiration is useful to the plant because: a) It helps in photophosphorylation. b) It helps to create a suction force for absorption of water from the soil. c) It splits water molecules. d) It helps in synthesis of glucose. A plant is kept in dark for about 48 hours before conducting any experiment on photosynthesis to: ix) x) xi) a) Remove starch from the plant. b) Remove chlorophyll from the leaves of the plant. c) Ensure that starch is not translocated from the leaves. d) Remove starch from the leaves of the plant. Piles of thylakoids lying in a colourless ground substance is known as: a) Grana b) Stroma c) Fret d) Chloroplast Cytokinins are predominantly present in: a) Permanent tissues b) Meristematic tissues c) Cortical region d) Endodermis The figure given below shows the stages of ripening in a banana. 3 The ripening of banana is accompanied with: xii) a) Rise in levels of auxin b) Rise in levels of ethylene c) Rise in levels of cytokinin d) Rise in levels of gibberellin A child frightened by loud noise runs to his mother. Name the hormone responsible for this response. xiii) xiv) (xv) a) Insulin b) Adrenaline c) Amylase d) Oxytocin Glucagon is secreted by: a) Alpha cells of pancreas b) Beta cells of pancreas c) Delta cells of pancreas d) Both a) and b) During menstrual cycle, level of luteinizing hormone is highest around: a) 28th day b) 7th day c) 21st day d) 14th day Which of the following represents A, B, C.? 4 a) A- Embryo, B- Foetus, C- Zygote. b) A- Foetus, B- Zygote, C- Embryo. c) A- Zygote, B- Embryo, C- Foetus. d) A- Zygote, B- Foetus, C- Embryo. Question 2 [25] (i) [5] Name the following: a) A sudden change in the genetic material that can be inherited. b) Permanently open structures seen on the bark of old woody stems. c) The solvent used to dissolve chlorophyll pigment while testing a leaf for the presence of starch. (ii) d) Hormone which plays an important role in phototropism. e) The disorder caused in children due to under secretion of thyroxine. Arrange and rewrite the terms in each group in the correct order so as to be in a logical sequence beginning with the term underlined. a) Water, Chlorophyll, Photon, Oxygen. b) Stoma, Palisade mesophyll, Sub-stomatal space, Spongy cells. c) Lowering of blood glucose level, Beta cells, Promotes utilization of glucose, Insulin. d) Telophase, Metaphase, Cytokinesis, Anaphase e) Oviduct, Uterus, Ovary, Cervix. 5 [5] (iii) Fill in the blanks with suitable words. [5] When a cell is (a) _________, its wall is stretched under (b) __________from inside, and in its turn, it presses the cell contents towards the (c) __________ of the cell. The pressure of the cell contents on the cell wall is called (d) ____________ pressure and the pressure exerted by the cell wall on the cell contents is called (e) _________ pressure. (iv) Choose the odd one out from the following terms and name the [5] category to which the others belong. a) ACTH, ADH, FSH, TSH. b) Temperature, Chlorophyll, CO2 concentration, Availability of water. c) Cowper s gland, Seminiferous tubules, Seminal vesicles, Prostate gland. d) Increase in humidity, Water content of the leaves, Increase in temperature, Active air movement. e) Round seed shape, Inflated pod shape, Dwarf plant, Yellow seed colour. (v) Match the items given in Column I with the most appropriate ones in Column II and rewrite the correct matching pairs. Column I Column II a) Mitotic phase 1.Nerium b) Polymerisation 2. Growth inhibitor c) S-Phase 3. Cell is metabolically active and continues to grow. d) Sunken stomata 4. Equational division e) Abscisic acid 5. Starch 6. Growth promoter. 7. DNA replication and chromosome duplication 6 [5] Section B (40 marks) (Attempt any four questions from this Section) Question 3 [10] (i) Define homologous chromosome. [1] (ii) State Mendel s law of dominance. [2] (iii) Give two examples of chemotropism in plants. [2] (iv) Give one difference between Graafian follicle and Corpus luteum with [2] reference to definition. (v) Draw a well labelled diagram of a human ovum. Question 4 [3] [10] (i) Expand the Abbreviation ACTH [1] (ii) Sheetal s father has been advised by a doctor to reduce his sugar [2] intake. Name the disorder he is suffering from and the hormone whose deficiency caused it. (iii) Differentiate between stroma and stoma based on the function. [2] (iv) State the observation of the experiment to prove that more [2] transpiration occurs from the undersurface of a dicot leaf. (v) Draw a neat labelled diagram of a plasmolysed cell. Question 5 [3] [10] (i) Explain the term bleeding with reference to plants. [1] (ii) A healthy potted plant was kept in dark room for 48 hours. Then a [2] portion of a leaf of the plant was covered with black paper and kept in bright sunlight for few hours. Later the leaf was plucked and tested for starch. What will be your observation after the starch test? (iii) A potted plant is made to lie horizontally on the ground. Which part of [2] the plant will show positive geotropism and negative geotropism? (iv) Pancreas is both a duct as well as a ductless gland. Justify the statement. 7 [2] (v) Study the diagram given below and answer the questions that follow: (a) Give the technical term for the solution present in the thistle funnel. (b) Why does the level of sugar solution rise in the thistle funnel after few [3] hours? (c) Name any two semi permeable membranes which can be used in place of parchment paper. Question 6 [10] (i) State the exact location of Leydig cells. [1] (ii) Differentiate between genotype and phenotype based on the [2] definition. (iii) Mention any two adaptations in leaf which favours the process of [2] photosynthesis. (iv) On sprinkling common salt on grass growing in lawn, the grass gets killed. Give reason. 8 [2] (v) Study the diagram given below and then answer the questions [3] that follow: (a) Identify the endocrine gland. (b) Why is the above gland referred to as the Master gland ? (c) State the function of somatotropin. Question 7 [10] (i) Explain the term hormone. [1] (ii) Leaves of Mimosa plant droops when touched. Give reason. [2] (iii) Differentiate between Photochemical phase and Biosynthetic phase [2] based on the products formed. (iv) Elaborate how Gibberellins and Abscisic acid are antagonistic (opposite) to each other with reference to: [2] a. Seed germination b. Senescence. (v) Study the diagram given below and answer the questions that follow: 9 [3] (a) Identify the parts labelled 3 and 5. (b) Mention the number and name of the part involved in implantation from the above diagram. (c) Name the two hormones produced by part 2. Question 8 [10] (i) What is the use of reservoir in Ganong s potometer. (ii) People living in the low Himalayan regions often suffer from simple goitre. [2] [1] Give reason. (iii) Explain the term apical dominance and mention the role of cytokinins [2] in this phenomenon. (iv) The placenta is an important structure for the development of a [2] foetus . State any two points in support of the statement. (v) Study the diagram and answer the questions that follow: 10 [3] (a) Identify the above stage and give a reason in support of your answer. (b) How many nuclear divisions take place in meiosis. (c) How cytokinesis occurs in a plant cell. ***** 11

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Additional Info : ICSE Class X Mid-term 2025 : Biology
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