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ICSE Class X Question Bank 2026 : Biology (Board Exam MCQs 2009 - 2024)

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PREPARED BY: THEJASHWINI.B XSTANDARD, BSS X BIOLOGY CHOOSE THE CORRECT ANSWER 2024 1. Duplicated chromosomes are joined at a point termed: a. Centrosome b. Centromere c. Centriole d. Chromatid 2. The process of conversion of ADP to ATP during photosynthesis is called: a. Photolysis b. Phagocytosis c. Photophosphorylation d. Poymerisation 3. The process in which water is lost from the margins of strawberry le es is: a. Osmosis b. Imbibition c. Diffusion d. Guttation 4. The hormone that affects urination is: a. Adrenaline b. Vasopressin c. Oestrogen d Thy xine 5. Which of the following helps in the opening of tomata a. Cobalt ions b. Potassium ions c. Magnesium ions d. luminium ions 6. A zygote which has Y chromosomes inherited tromthefather will develop into a. Will depend on the chromosome inherited fromthe mother b. Girl c. either boy or girl d. Boy 7. The ear ossicles that transport sound vibrations to the inner ear: c. Incusd Cochlea 8. Ifa person has heart attack, what nmust be done immediately: P. Loosen his/her clething QMake him/her lie down in an airy room R. Rush him/her to the ospita! S. Engage him/her in a conversation a. Stapes b. Malleus a. P and0 Pand S Rand S d. P, Q and R 9. Adjusting the focal lengthothe eye lens to view objects at different distances is done by: a. Cornea 6. Iris C. Ciliary muscles d. Sclera 10, Four friends P, Q, Rand S were discussing the examples of genetic disorders. The examples they quote were as follows: P. Colour blindness and malaria Q. Albinism and cholera R. Haemophilia and colour blindness R. Haemophilia and albinism Who gave the correct examples? a. P and Q b. R and S c. P and R d. Q ands 11. Osmosis takes place when there is: a. A freely permeable membrane b. A cell wall c. A selectively permeable membrane d. An impermeable membrane Page 1 X STANDARD, BSS PREPARED BY: THEJASHWINI.B 12. A male gorilla has 48 chromosomes in each of its body cells. How many chromosomes will each of the sperms have? Which of the following is correct? a. 24 b. 48 c. 12 d. 16 13.Assertion (A): sympathetic nervous system prepares the body for violent action against abnormal conditions Reason (R): Sympathetic nervous system accelerates heartbeat. Which of the following is correct? a. Both A and R are true d. BothA and R are false b. A is true, R is false c. A is false ut R is true 14. Birth rate is the number of live births per thousand persons a. 1 year b. 2 years c. 10 years d. 20 years 15. Industrial Melanism was observed in: a. Mice b. Peppered Moth c. House Flies Crow 2023 16. The sex chromosome in a human ovum is: a. X chromosome b. Y chromosome c. Both Xand Y chromosomes d. Either X or Y chromosome 17.Which one of the following is abiodegradable waste? a. Metal cans c. Plastic d. Flowers b. Ewaste 18.The heart sound Dup' is produced whenr a. Semilunar valves open c. Semilunar yalves close bAtrioventricular valves close Atrio ventricular valves open 19.Deplasmolysis uccus when aplasmolysed cell is placed in: a. Concentrated salt solution b. Tap water c. Concentrated sugar solation d Hypertonic salt solution 20.Alpha cells of pancyeas secrete: a. Glycoger b. Glucose c. Glucagon d. Insulin 21.Haploid number of chromosomes are found in: a. Nephrons b. Neurons c. Skin cells d. Sperms 22.The life span of an RBC is: a. 120 days b. 220days c. 20 days d. 2 weeks 23.The statistical study of human population is called: a. Mortality b. Demography c. Natality d. Equality 24.The pale yellow colour of normal urine is due the pigment: a. Melanin b. Anthocyanin c. Urochrome d. Haemoglobin Page 2 PREPARED BY: THEJASHWINI.B X STANDARD, BSS 25.Stimulation of the nerves of the sympathetic nervous system: a. Accelerates heartbeat b. constricts pupil of eyes d. Retards heartbeat Increases peristalsis 26.The site of light reaction in the cells of a green leaf is: a. Nucleus b. Grana of chloroplast c. Cytoplasm d. Stroma of chloroplast 27.The paper used to demonstrate unequal transpiration in a dicot leaf is: a. Filter paper b. Litmus paper c. Starch paper d. Cobalt ckloride paper 28.Vitreous humour is present between: a. Cornea and iris b. Lens and retina c. Iris and lensd. Cornea a,d lens 29.0xygenated blood to liver is supplied by: a. Hepaticartery b. Hepatic vein c. Inferior vena ava d. Hepatic portal vein 30.During the synthesis phase of the cell cycle, more of. a. RNA is synthesized b. RNA and proteins are synthesized c. DNA is synthesized d. Glucose is synthesized 2022 31.The mineral element in haemoglobin a. Manganese b. Iron c. Sodium d. Caleim 32.The number of cranial nerves in humans are: a. 12 b. 31 pairs 31 d. 12pairs 33.Gigantism and Acromegaly are due to: a. Hypersecretion f Growth hornone c. Hyposecretion ofG wth hormone 34. Pericardium coers the: b. Hypersecretion of Thyroxine d. Hyposecretion of Thyroxine a. Heart b. Braun c. Sp nal cord d. Eyeball 35. The circular opening in the centre of iris: a. Lers b.,Corneae. Sclera d. Pupil 36. The blood vessel that carries oxygenated blood is: a Pulmonary artery b. Pulmonary vein 37. Orgam of corti is present inside the: a. Cochlea b. Semicircular canals c. Renal vein c. Sacculus 38. The structure that stores urine temporarily is: a. Ureter b. Urethra c. Urinary bladder d. Hepatic vein d. Utriculus d. Kidneys 39. Islets of Langerhans are located in: a. Liver b. Pituitary gland c. Spleen d. Pancreas 40. The main nitrogenous waste formed in the human body: a. Uric acid b. Urea C. Ammonia d. Creatinine 41. The process of conversion of ADP to ATP during Photosynthesis: Page 3 PREPARED BY: THEJASHWINI.B X STANDARD, BSS a. Polymerisation. d. Photolysis. b. Photophosphorylation. c. Photorespiration. 42. Pernmanently open structures seen on the barks of old woody stems: b. Hydathodes. a. Stomata. c. Lenticels d. Epidermal pores. 43. The pressure developed in the roots due to continuous inward movement of water by cell to cell osmosis: a. Root pressure. b. Wall pressure. c. Turgor pressure. d. Air pressure. 44. The type of gene, which in the presence of a contrasting allele ishot expressed: a. Homozygous b. Heterozygous. c. Dominant. d. Recessive. 45. After Mitosis, a female human cell will have: a. 44 + XX chromosomes. b. 22 + X chromosomes c. 22 + Y chromosomes. 46. At the end of a. Metaphase. d. 44 + XY chrotnosomes, Cytokinesis is completed. b. Prophase. c. Interphase d. Telophse. 47. The genotype of a person who cannot roll his tongue is a. Rr b. RR C. rr d. RRr 48. A cellbecomes plasmolysed when it is placed in a. Distilled water. b. Hypertonie. c. Isotonic. d. Hypotonic. 49. The nitrogenous base Adenine always pairs with a. Thymine. b. Guanine. .Cytosine. d. Thiamine. 50. The basic units of heredity are a. Chromosomes. b, Chromatids. c. Genes. d. Centrosome. 51. NADP is expanded as: a. Nicotinamide Adonosine Dinuctcotide Phosphate. b. Nicotinamid Adenine Dinucleotide Phosphate. c. Nicotinamide Adenine Dinucleolus Phosphate. d. Nicotinamide Adenosine Dinucleolus Phosphate. 52. Transpiration i_ usefulio theplant because it: a. Creates asuction forcefor absorption of water from the soil. BAelpsin Photophosphorylation. c Synthesises glucose. d. Splits water molecules. 53. A homozygous pea plant having purple flowers is crossed with a homozygous pea plant bearing white flowers. The phenotypic ratio of the offspring obtained in F2 generation is: a. 2: 1 b.l:1 c. 1:2:1 d. 3:1 54. A shoot from a balsam plant is kept in a beaker containing eosin solution (pink). The pink colour will be distinctly seen in the: a. Xylem b. Phloem c. Epidermis d. Cortex 55. Replication of DNA in the cell cycle occurs during the: Page 4 XSTANDARD, BSS a. G1 - phase. PREPARED BY: THEJASHWINIL.B b. Anaphase. c.S- phase. d. G2 - phase. 2021 56. Ganong's Potometer is used to study: a. Photosynthesis b. Exosmosis c. Rate of uptake of water d. Guttation VIN 57. A plant cell may burst when placed in a hypotonic solution because: a. Turgor pressure equalizes wall pressure b. Turgor pressure exceeds wall pressure c. Wall pressure exceeds turgor pressure d. None of the above 58. The number of chromosomes in a human skin cell are: a. 23 b. 46 c. 22 d. 44 59. Cretinism and Myxedema are due to: a. Hyper secretion of thyroxine b. Hyper secretion of growth hormone c. Hypo secretion of thyroxine d. Hypo secretion of growth hormone 60. Light dependent phase of Photosynthesis occ rring nthe green leaves of plants, takes place in the: a. Cytoplasm of palisade cells c. Stroma of the chloroplast b. Nucleus of palisade cells d. Grana of the chloroplast 2020 61. The fusion of the sperm and ovumis termed as: a. Reproduction b. Development e. Fertilization d. Embryo 62. Agranulocytes are: b. Lymphocytes, Basophils a. Lymphocytes Mon vtes c. Eosinophils, Basophils c. Eosinophils, Monocytes 63. Which ofthe following isot a natural reflex action? a. Knee-jerk b. Blinking of eyes d e to strong light .Salivati n at the sight of food d. Sneezing when any irritant enters the nose 64. The structural and functional units of excretion in the human kidney is the: a. Ureter b. Bowman's capsule c. Renal pelvis d. Nephron 65. In a human female, ovum consists of: a. 23 pairs of autosomes b. 22 pairs of autosomes and 1 pair of sex chromosomes c. 22 autosomes and 1 Y-chromosome d. 22 autosomes and 1 X-chromosome 2019 Page 5 XSTANDARD, BSS PREPARED BY: THEJASHWINILB 66. While recording the pulse rate, where exactly does a doctor press on our wrist? a. Nerve b. Vein c. Artery d. Capillary 67. In a human male, a sperm will contain: a. Both X and Y chromosomes b. Only Y Chromosomes d. Either X or Y Chromosomes c. Only X chromosome 68. A muscular wall is absent in: c. Arteriole a. Capillary b. Venule d. Vein 69.On which day of the menstrual cycle does ovulation take place? a. 5th day b. 28th day c. 14th day d. 1st day 70. Which one of the following does not affect the rate of transpiration? c. Wind d. Age of the plant a. Light b. Humidity 2018 71. The number of Spinal nerves in a human being are: a. 31 pairs b. 10 pairs C. 21 pairs d. 30 pairs. 72. Which one of the following is non-biodegradable? a. DDT b. Vegetable peel c. Cardboard Bark of trees 73. Aqueous humour is present between the:) a. Lens and Retina c. Cornea and Iris b. Iris and Lens d. Cornea and Lens 74. AstFORg ehemieat substanee whieh-is used eH- objeets-and surfaees in-euF -sUFFOURdings te-kiH germs: a Cresel. b. Carbeie aeid e. Jedine d MereFeehreme 75. Which one of the following is a Greenhouse gas? Sulphur dioxide a. Oxygen b. Methane 2017 76. The prime source of chlorofluorocarbons is : a. Vehicular emissions Industrial effluents d. Nitrogen c. Domestic sewage d. Refrigeration equipments 77. Peaieillin obtained fre-afungus is+ a Antibietie b. Antiseptie e AAtibedy d Antiserm 78. Marine fish when placed in tap water bursts because of: a. Endosmosis b. Exosmosis c. Diffusion d. Plasmolysis 79. Surgical method of sterilization in a woman involves cutting and tying of: a. Ureter b. Uterus c. Urethra d. Oviduct 80. Synthesis phase in the cell cycle is called so, because of the synthesis of more: a. RNA b. RNA and proteins c. DNA d. Glucose 2016 Page 6 XSTANDARD, BSS PREPARED BY: THEJASHWINI.B 81. A plant cell may burst when: a. Turgor pressure equalises wall pressure. b. Turgor pressure exceeds wall pressure. c. Wall pressure exCeeds turgor pressure. d. None of the above 82. The individual flattened stacks of membranous structures inside the chloroplasts are known as: a. Grana b. Stroma c. Thylakoids d. Cristae 83. The nephrons discharge their urine at the: a. Urinary bladder b. Urethra c. Renal pelvis d. Renal pyramid 84. Gigantism and Acromegaly are due to: a. Hyposecretion of Thyroxine b. Hyposecretion of Growth hormone c. Hypersecretion of Thyroxine d. Hypersecretion of Growth hormone 85. The mineral ion needed for the formation of blood clot is: a. Potassium b. Sodium c. Calcium d. Iron 2015 86. A single highly coiled tube where spermns are stored, gets concentrated and mature is known as a. Epididymis b. Vas efferentia c. Vas deferens d. Seminiferous tubule 87. Chromosomes get aligned at the center of the cell during a. Metaphase b. Anaphase c. Prophase d. Telophase 88. BEGvaeeine is effeetive against: d AMeasles a. CheBera b. Mumps e. TubeFeulesis 89. Which one of the following is mainly associated with the maintenance of the posture? a. Cerebrum b. Cerebellum c. Thalamus d. Pons 90. An example of non-biodegradable waste is a. Vegetable peels b. Sewage c. Livestock waste d. 2014 91. After mitotic cell division, a female human cell will have: a, 44 + XX chromosomne. b. 44 + xy chromosome c. 22 + x chromosome d. 22 +y chromosome 92. The site of maturation of human sperms is the: a. Seminiferous tubule b. Interstitial cells c. Epididymis d. Prostate gland. 2013 93. The cell component visible only during cell division: Page 7 DDT PREPARED BY: THEJASHWINI.B XSTANDARD, BSS a. Mitochondria b. Chloroplast c. Chromosome d. Chromatin 94. Pulse wave is mainly caused by the: a. Systole of atria b. Diastole of atria c. Systole of the left ventricle d. Systole of the right ventricle 95. A gland which secretes both hormone and enzyme is the: a. Pituitary b. Pancreas c. Thyroid d. Adrenal 2012 96. BCG vaccine is used to build immunity against: a. Poliomyelitis b. Tubereulosis c. Malaria d. Whooping cough 97. A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to: a. Remove starch from the plant b. Ensure that starch is not translocated from the leaves c. Remove chlorophyll from the leaf of the plant d. Rem0ve starch from the experimental leaf 98. The part of the human eye where rod cells and cone cells are located is the: a. Retina b. Cornea c. Choroid d. Sclera 99. A reflex arc in man is best described as movement of stimuli from: a. Receptor cell, Sensory neuron, relaying neuron, effector muscles. b. Receptor cell, efferent nerve, relaying neuron, muscles of the body c. Receptor cell, spinal cord, motor neuron, relaying neuron. d. Receptor cell, synapse, motor neuron, relaying neuron. 2010 100. A point of contact between two neurons is termed: a. Synapsis b. Neuro motor junction c. Synapse 101. Loss of water as droplets from hydathodes is called a. Transpiration b. Bleeding c. Guttation 102. The technical term for the fertilized egg is: a. Placenta b. Zygote c. Morula 103. The photo receptor cells ofthe retina sensitive to colour are: a. Cones b. Rods c. Organ of Corti 404. Salk'svaeeine is Hsed te-buildinuAity against: a. TuberetBesisb. Peliemyelitis e. MaBerie 2009 105.The cerebral hemispheres in mammals are connected by: a. Corpus luteum b. Hypothalamus c. Pons varolli 106. Insulin is secreted by: a. Beta cells of pancreas c. Delta cells of pancreas b. Alpha cells of pancreas d. None of the above 107. A de-starched plant is one whose: Page 8 d. Corpus callosum XSTANDARD, BSS PREPARED BY: THEJASHWINI.B a. Leaves are free from chlorophyll b. Aerial parts are free from starch c. Plant is free from starch. c. Leaves are free from starch 108. The onset of menstruation in the female is termed: a. Ovulation b. Menarche c. Menopause d. Parthenogenesis T H E J A Page 9 S H V W I

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