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ICSE Class X Sample / Model Paper 2025 : Biology

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MRS. TARLIKA JHAVERI S PRIVATE TUTORIALS (M.Sc. B.Ed.) GROUP TUITION TEST SERIES CRASH COURSE PERSONAL TUTORIALS COACHING FOR SCHOOL SECTION : VIII, IX & Xth (ICSE) BIOLOGY 98699 98426 SECTION A (Attempt all questions from this section) Question 1. Select the correct answers to the questions from the given options. (Do not copy the questions, write the correct answer only) [15] a) Cell wall is i) Semi-permeable ii) Selectively permeable iii) Impermeable iv) Freely permeable Ans : (iv) Freely permeable The cell wall is freely permeable as it allows the free exchange of water and nutrients between the cells and outer environment. b) Loss of water as droplets from hydathodes is called i) Transpiration ii) Bleeding iii) Guttation iv) Evaporation Ans : (iii) Guttation Guttation refers to the loss of water as droplets from the edges of leaves, typically through structures called hydathodes. It usually occurs during the night or early morning when the soil moisture is high, and transpiration is low. c) Assertion (A): Aqueous humour is present between the cornea and lens. Reason (R): Aqueous humour helps maintain intraocular pressure and provides nutrients to the lens and cornea. i) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A). ii) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). iii) Assertion (A) is true, but Reason (R) is false. iv) Both Assertion (A) and Reason (R) are false, and Reason (R) is not the correct explanation of Assertion (A). 1 Ans : (i) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A). The aqueous humour is a clear fluid located between the cornea and the lens in the eye. Its primary functions are to maintain intraocular pressure, which is essential for the shape of the eye, and to provide nutrients to the cornea and lens, which do not have their own blood supply. Therefore, both the assertion and the reason are true, and the reason correctly explains the assertion. d) Chromosomes get aligned at the center of the cell during: i) Telophase ii) Anaphase iii) Metaphase iv) Prophase Ans: iii) Metaphase e) Bicuspid and tricuspid valves are closed during i) ventricular systole ii) atrial systole iii) late joint diastole iv) ventricular diastole Ans : (ii) ventricular systole During ventricular systole, the bicuspid (mitral) and tricuspid valves close to prevent the backflow of blood into the atria as the ventricles contract and pump blood out of the heart. This closure produces the first heart sound (lub). f) Assertion (A) In human beings, eggs contain both X-chromosomes. Reason (R) In human beings, females are homogametic. i) Both Assertion and Reason are true. ii) Both Assertion and Reason are false. iii) Assertion is true and Reason is false. iv) Assertion is false and Reason is true. Ans : (i) Both Assertion and Reason are true. In human beings, the egg always contains an X chromosome because females have two X chromosomes (XX) and are therefore homogametic. This means that all eggs produced by females carry an X chromosome. Males, on the other hand, are heterogametic (XY), and sperm can carry either an X or a Y chromosome. Therefore, both the assertion and reason are true g) Surgical method of sterilization in women involves cutting and tying of i) Ureter ii) Fallopian tube iii) Uterus 2 iv) Urethra Ans : (ii) Fallopian tube h) A teacher asked her students to name two organs involved in human reproduction. Raj said: Ovaries and Uterus Sonu said: Testes and Pancreas Lata said: Uterus and Fallopian tubes Abhay said: Liver and Ovaries Who was correct? i) Raj and Lata ii) Sonu and Abhay iii) Raj and Sonu iv) Lata and Abhay Ans. i) Raj and Lata i) Assertion (A): The left ventricle has the thickest wall in the heart. Reason (R): The left ventricle needs to pump oxygenated blood to all parts of the body, requiring a stronger contraction and thicker muscular wall. i) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A). ii) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). iii) Assertion (A) is true, but Reason (R) is false. iv) Assertion (A) is false, but Reason (R) is true. Ans : i) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A). j) The thin membranous sac serving as the reservoir of urine is i) ureter ii) urinary bladder iii) glomerulus iv) kidney Ans : (b) urinary bladder The urinary bladder is a thin, membranous sac that serves as the reservoir for urine, temporarily storing urine until it is expelled from the body through urination. Therefore, the correct answer is k) Thylakoids are located: i) In the root hairs. ii) Around the lenticels. 3 iii) In the chlorophyll iv) Around the endoplasmic reticulum. Ans: iii) In the chlorophyll l) Neha was learning about blood vessels and their functions. She made the following table: Blood Vessel Function P Carries oxygenated blood away from the heart. Q Carries deoxygenated blood toward the heart. Identify the correct pair. (a) P Arteries, Q Veins (b) P Veins, Q Arteries (c) P Capillaries, Q Arteries (d) P Veins, Q Capillaries Ans : (a) P Arteries, Q Veins Arteries carry oxygenated blood away from the heart, and veins carry deoxygenated blood toward the heart. m) The deficiency of ADH causes : i) diabetes insipidus ii) diabetes mallitus iii) dwarfism iv) acromegaly Ans : (a) diabetes insipidus The deficiency of ADH (Antidiuretic Hormone) causes a condition called diabetes insipidus, which results in the kidneys being unable to conserve water. This leads to excessive urination and thirst. n) Agranulocytes are: i) Lymphocytes, Basophils ii) Eosinophils, Basophils iii) Eosinophils, Monocytes iv) Lymphocytes, Monocytes Ans. ii) Eosinophils, Basophils 4 o) Observe the shown picture and identify the endo exocrine gland. i) Adrenal gland ii) Pancreas iii) Hypothalamus iv) Thyroid gland Ans. ii) Pancreas Question 2. a) Name the following: [5] i) The pollutant that cuts down the oxygen carrying capacity of RBC. Carbon Monoxide ii) The fluid that fills between amnion and embryo. Amniotic fluid iii) The collective term for all the nuclear changes that occur during cell division. Karyokinesis iv)The form in which glucose is stored in the liver. Glycogen v) The structure formed by the villi of the embryo and uterus of the mother. Placenta b) Identify and match the structure of nephron labeled A to E with their correct names: Example: F - 5: Collecting duct Structure of Nephron Name of the part of nephron 5 [5] 1. Descending loop 2. Glomerulus 3. PCT 4. DCT 5. Collecting duct 6. Ascending loop Ans. A- 2, B-1, C-3, D-4, F-5 c) State the exact location for the following: [5] i) Epididymis (On the top of kidneys ) ii) Malleus (Between tympanum and incus ) iii) Myelin Sheath ( Around the axon) iv) Islets of Langerhans (In the pancreas) v) Palisade mesophyll cells (Between upper epidermis and spongy mesophyll) d) Choose the odd one out from the following terms and name the category to which others belong: [5] i) Ozone, Carbon dioxide, Sulphur dioxide, Nitrogen oxide. ii) Abortion, Tubectomy, Vasectomy, IUD. iii) Grana, Thylakoid, Stroma, Root. iv) Testes, Prostate gland, Seminal vesicle, Cowper s gland. v) Growth hormone, TSH, Vasopressin, LH. (a) Odd Category Ozone Air pollutants 6 (b) (c) (d) (e) Abortion Methods of contraception or sterilization Testes Male accessory glands Root Helps in photosynthesis Vasopressin Hormones secreted by the anterior pituitary e) State whether the following statements are true or false. If false, rewrite the correct form of the statement by changing the first or last word only: [5] i) The functional unit of the nervous system is a nephron. False Neuron False .. Auxin/gibberellins/ cytokinins ii) Abscisic acid is a growth promoting hormone. False .. Oestrogen iii) Testosterone produces female sexual characters. iv) Guttation is the exudation of plant sap from the injured parts of the plant. False .. Bleeding v) Serum is the plasma that is devoid of fibrinogen. True SECTION B (Attempt any four from this section) Question 3. a) Define : Parturition (Act of expelling the full term foetus from the mother s uterus at the end of gestation.) [1] b) [2] Differentiate between carboxy haemoglobin and carbamino haemoglobin. Hb+ CO Hb+ CO2 c) Give reason: Though the RBC lacks endoplasmic reticulum it is beneficial for them. [2] Flexible, can pass through narrow blood capillaries. d) Why does an alcoholic person walk clumsily? [2] It affects Cerebellum , which controls muscular coordination. e) Study the diagram and answer the following questions. 7 [3] i) Identify the structure labeled as A Prostate gland ii) How does part F differ from part D? Part F present inside the body, part D present outside the abdomen. iii) Among A, B, C where are seminiferous tubules located? In part C Question 4: : a) Define Gestation period. [1] Gestation, in mammals, is the time between conception and birth, during which the embryo or fetus is developing in the uterus. Ans. b) Justify the statement: Pinna is a vestigial organ in humans. [2] Ans. Pinna in the human ear is a functionless organ. That's whyPinna is a vestigial organ in humans. c) State the changes occurring during metaphase of cell division. [2] Chromosomes attach to spindle fibre by centromere, chromosomes lined up at the equator. d) Give scientific reason: The pituitary gland is called the master gland. [2] It controls the activities of the other endocrine glands . e) The diagram given below shows the section of kidney, answer the questions that follow. i) Name the protective covering in which the above structure is located. Renal Capsule ii) What is the fluid that passes through part 4. Urine 8 [3] iii) Mention the structural and functional units of kidneys. Nephrons Question 5: a) Define Accommodation : focussing of the eye to see the objects clearly. [1] b) Riju was writing a composition Save Environment . i) Is writing a composition an involuntary or voluntary action? ii) Name the part of the brain that Riju uses for writing the composition i) [2] Voluntary action ii) Cerebrum b) India is a highly populated country , Mention any two reasons in support of the statement. [2] Lack of education/ religious belief/ health facilities (any two) d) Differentiate between Vasectomy and Tubectomy [2] e) Draw a neat labeled diagram for correction of myopia. [3] Question6: a) Define homologous chromosomes. [1] The pair of chromosomes which are similar in size and shape. b) Differentiate between tympanum and pericardium [Location] [2] Tympanum in the ear, surrounding the heart c) Expand the abbreviations : 1) NADP 2) ACTH Nicotinamide Adenine dinucleotide phosphate d) [2] Adreno Cortico Tropic Hormone Explain two forces contributing to ascent of sap in a plant. [2] Root pressure, Transpiration e) The diagram given below shows a developing human foetus in the womb. Study the same and then answer the following questions: [3] 9 i) Label the parts 1 and 2 1- umbilical cord 2- Placenta ii) Write any one function for part labelled 2 (provide nutrition to the foetus) iii) What are fraternal twins? . (The twins produced from two eggs, to produce two individuals ) Question 7: a) State the function of the Eustachian tube . equalizes the air pressure on both side of the eardrum. [1] b) Write the significance of the hepatic portal system. [2] Carries blood from stomach and small intestine to the liver, it detoxifies the blood and then adds to posterior vena cava. c) Differentiate between nervous system and excretory system.[ Basic units] [2] Neurons and Nephrons d) What are two types of nucleic acid present in the human body, write their full forms. [2] Ribonucleic acid and deoxyribonucleic acid. e) Observe the diagram given below and answer the questions that follow. i) Explain the phenomenon studied using the above apparatus Transpiration : loss of water in the form of water vapour from aerial parts of the plant. ii) State two limitations of using this apparatus. To set air bubble is difficult, the twig may not live alive for longer period of time iii) Name the parts in a plant through which the above process takes place. Stomata, lenticels, cuticle Question 8: 10 [3] a) Define Sanitary landfills. [1] Sites where waste is covered and allowed to decompose. b) What are the causes of long sightedness? [2] Lens is too flat, shortening the eyeball from front to back. c) Mention the abnormalities caused due to hypersecretion of the growth hormone. [2] Gigantism and Acromegaly d) Name two famous biologists who proposed the Theories of Evolution [2] Charles Darwin and Lamark e) Given below is a representation of a type of pollution. Study the picture and answer the question. [3] i) Name the one source of this pollution Smoke from factories ii) Write one ailment caused due to this pollution. Asthama iii) State one gas that leads to the depletion of the ozone layer. CFC *....................................................*.......................................................... 11

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