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ICSE Class X Sample / Model Paper 2025 : Biology

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Arya Limaye
Ambassador School, Dubai

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REVISION TEST BIOLOGY Maximum Marks: 40 Time allowed: One hour Section A is compulsory. Attempt any two questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION A (Attempt all questions from this section) Question 1 Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answers only.) [5] (i) The cerebral hemispheres in mammals are connected by: a. Corpus luteum b. Hypothalamus c. Pons varolli d. Corpus callosum (ii) Insulin is secreted by: a. Beta cells of pancreas b. Alpha cells of pancreas c. Delta cells of pancreas d. Gamma cells of pancreas (iii) A de-starched plant is one whose: a. Leaves are free from chlorophyll b. Areal parts are free from starch c. Leaves are free from starch d. Plant is free from starch (iv) Angina pectoris is due to: a. Defective nutrition b. Chest pain due to inadequate supply of oxygen to the heart muscle c. Defective functioning of mitral valve d. Infection by a virus (v) Which statement about mitosis is incorrect? a. The prophase takes longer time than metaphase b. Metabolic activity ceases during the interphase c. Centromeres are the first to move to the opposite poles d. Chromosomes reach the opposite poles at the anaphase Question 2 (i) Name the following. [5] a. The statistical study of the human population of a region. b. The biological term given to the protective membranes of the brain. c. The photosensitive pigment present in the rod cells of the retina. d. The part of ear responsible for static equilibrium. e. The universal recipient blood group. (ii) Give the specific function of the following structures: a. Hydathodes b. Corpus luteum c. Eustachian tube (iii) Identify the name of the following processes/term from the statements given below: [3] a. Movements of molecules from a region of higher concentration to a region of lower concentration. b. Chromosomes appear thread like. c. A pair of chromosomes carrying dissimilar alleles for a particular character. Explain the following terms. [4] a. Natality b. Photolysis in photosynthesis c. Parturition d. Speciation (iv) [3] SECTION B (Attempt any two questions from this section) Question 3 (i) (ii) (iii) Name the surgical method of contraception in males and females. [1] Why does one feel blinded for a short while on coming out of a dark room? [2] Explain the how the rate of transpiration is affected on: [2] a. A windy day b. A foggy day (iv) (v) Mention any four adaptations found in plants to favour the process of photosynthesis. [2] Name the hormone responsible for the following functions. [3] a. Increase in heart beat b. Converting glycogen to glucose c. Regulates basal metabolism d. Responsible for normal growth of the body e. Increased reabsorption of water in the kidneys f. Milk ejection from the mammary glands Question 4 (i) (ii) (iii) (iv) (v) Define: vestigial organs. [1] Mention any two harmful effects of acid rain. [2] Draw a neat-labelled diagram of chloroplast. [2] Give reasons: [2] a. Blind spot is considered as area of no vision. b. Meiosis is also known as reduction division. Given below is the schematic representation of the circulatory system in man. Study the diagram and answer the questions that follow. [3] a. Name the parts 1 to 4 indicated in the diagram. b. Give one difference between the part 1 and 2 based on the nature of blood flowing through them. c. Give the specific name of the type of blood circulation that takes place between (a) heart and lungs abs (b) heart and body parts. Question 5 (i) (ii) (iii) Expand the abbreviation - MTP. [1] Differentiate between biodegradable & non-biodegradable waste. [2] Why sunflower plants bend towards light? [2] (iv) (v) Make a punnet square for the cross between two heterozygous purple flowers. Write the genotypic and phenotypic ratios of the offspring. [2] The diagram below represents a stage during cell division. Study the same and then answer the questions that follow. [3] a. Name the parts labelled 2 and 3. b. Identify the above stage and give a reason to support your answer. c. Name the stage prior to this stage and draw a diagram to represent the same.

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