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ICSE Class X Prelims 2023 : Biology (GEMS Modern Academy, Dubai)

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PRELIMINARY EXAMINATION 2022 - 23 BIOLOGY GRADE: 10 DATE: 6/1/23 TIME: 2 HOURS MAX. MARKS: 80 ____________________________________________________________________________ [The time stated above is the time allowed for writing the examination. In addition, the first 15 minutes will be the time given for reading the question paper] This question paper is divided into two sections. Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets []. ____________________________________________________________________________ SECTION A (40 MARKS) (Answer all questions in this section) Question 1 Select the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only: [15] 1. The alternate form of a gene is a.Variation b. Heredity c. Mutation d. Allele 2. Adrenocorticotropic hormones stimulate the adrenal cortex to produce a. Testosterone b. Aldosterone c. Cortisol 3. Fertilisation of ova in human takes place in a. ovary b. Uterus c. Fallopian tube d. Adrenaline d. Vagina 4. This pressure facilitates filtration while urine is being formed a. hydrostatic pressure b. osmotic pressure c. blood pressure d. diffusion pressure 5. Circulation loop to provide oxygenated blood through the rest of body is classified as a. pulmonary circulation c. cardiac circulation b. systemic circulation d. lymphatic circulaiton Page 1 of 6 6. When carbon dioxide is absorbed by haemoglobin, it is called as a. carbaminoharemoglobin b. carboxyhaemoglobin c. oxyhaemoglobin d. deoxyhaemoglobin 7. A gland having endocrine as well as exocrine function a. pituitary gland b. thyroid gland c. pancreas d. adrenal gland 8. Plants lose water by guttation when: a. rate of transpiration is high b. soil is wet and the atmosphere is humid c. soil is dry and atmosphere is dry d. soil is wet and atmosphere is dry 9. Salting of meat or addition of salt to pickle is a method of preservation by a. Osmosis b. Exosmosis c. Plasmolysis d. Deplasmolysis 10. The region in the eye where the rods and cones are located is the, a. Retina b. Cornea c. Choroid d. Sclera 11. The membranous labyrinth contains a fluid called, a. Haemolymph b. lymph c. endolymph d. perilymph 12. Population density means, a. statistical study of human population b. number of individuals per km2 at any given time. c. Number of individuals at any given time d. Difference of growth and death rate 13. Breathing, heart rate and blood pressure are controlled by a. cerebellum b. pons c. hindbrain d. medulla oblongata 14. The specific function of light energy in the process of photosynthesis is to a. reduce carbon dioxide b. synthesize glucose c. activate chlorophyll d. synthesize NADPH 15. Most transpiration in herbaceous plants occurs through: a. Stomata b. Lenticels c. Cuticle Page 2 of 6 d. Hydathodes Question 2 A. Name the following. i. Name the cleanliness campaign started by the government of India. ii. Number of deaths per thousand of population per year iii. The chemical substance used to absorb Carbon dioxide. iv. The hormone responsible for regulating basal metabolism in animals. v. The phytohormone which inhibits the growth of plants. B. State the exact location of the following structures. i. ii. iii. iv. v. [5] Tympanum Glomerulus Adrenal gland Centrosome Corpus callosum C. Arrange the following term in the logical sequence. i. ii. iii. iv. v. [5] [5] Oxygen in air, mesophyll cell, substomatal space, stoma Pupil, fovea, vitreous humor, lens, optic nerve Implantation, ovulation, gestation, parturition, fertilization Ureter, urinary bladder, renal artery, urethra, kidney Incus, stapes, malleus, pinna, cochlea D. Match the items given in Column I with the most appropriate ones in Column II and rewrite the correct matching pairs. [5] Column I Column II (a) Carbon dioxide 1. Spermatogenesis (b) Water pollutant 2. Short sightedness (c) Seminiferous tubule 3. Hyposecretion adrenal cortex (d) Myopia 4. Industrial waste (e) Addison s disease 6. Green house effect 7. Hypersecretion adrenal cortex E. Find odd one out from the following and state the categories of others. i. ii. iii. iv. v. Purkinje fibres, AV node, AV valve, SA node Diabetes milletus, diabetes insipidus, gigantism, dwarfism Axon, dendron, photon, cyton Polythene bag, crop residue, animal waste, decaying vegetable Chicken pox, color blindness, haemophilia, albinism Page 3 of 6 [5] SECTION B (40 MARKS) (Answer Any FOUR questions in this section) Question 3 i. Mention the significance of hormone vasopressin. [1] ii. Give two differences between cranial and spinal nerve. [2] iii. Define osmotic pressure. How is this different than turgor pressure? [2] iv. Expand the following two terms, [2] a. IAA b. LH v. Given below is an example of a particular structure and its special functional activity. Eg. Glomerulus and ultrafiltration On a similar pattern complete the following [3] a. b. c. Corpus luteum and ______________ Utriculus and ___________ Chordae tendinae and _________ Question 4 i. What was responsible for rapid rise in world population. [1] ii. Draw a flowchart to describe the process of blood clotting . [2] iii. Draw a neat and labelled diagram of eye to show correction of myopia. [2] iv. Mention two harmful effects of noise pollution. [2] v. The diagram given below is that of a developing human foetus in the womb. Study the same and then answer the question that follows: [3] i. Name the part labelled 1. ii. What is the normal gestation period (in days) of the developing human foetus? iii. Explain the role played by the part labelled 3. Question 5 i. ii. iii. iv. Why does renal cortex appear dotted. [1] Mention the significance of following 2 phythormone, [2] a. Cytokinins b. Ethylene Mention 2 differences between adaptation and accommodation of eye. [2] Draw a neat and labelled diagram of a root hair cell when excess fertilizer is sprinkled in the soil. [2] Page 4 of 6 v. Given below are the functions of certain organ structures found in living organisms. In each case, name the organ or structure that: i. Spermatogenesis ii. Insulates axon. iii. Secretes Glucagon [3] Question 6 i. ii. iii. iv. v. Define Reflex arc. Define fertilization. Why is sperm cell haploid in chromosome number? Mention 2 significance of placenta for the fetus. Name the repetitive units of DNA. Mention it s components. The diagram given below represents the human heart in one phase of its activity. Study the same and answer the questions that follows, i. ii. [1] [2] [2] [2] [3] Which part of the heart is contracting in this phase? Give a reason to support your answer. Name the parts numbered 1 and 2. Question 7 i. ii. iii. iv. v. Differentiate between menarche and menopause. [1] In a certain species of animals, black fur (b) is dominant over brown fur(b). Predict the genotypic and phenotypic ratios of the offspring when both parents are heterozygous black fur. [2] What is lenticular transpiration? Mention one difference between lenticular and stomatal transpiration other than structure involved. [2] Name the cells responsible for producing testosterone in males. Explain the surgical method for birth control in males. [2] Study the diagram and answer the following questions: [3] 1. Name the process that is shown in the diagram. 2. Why is oil placed over the water? 3. What do we observe with regard to the level of the water when this set up is placed in (a) bright light (b) Humid day (c) Hot weather Page 5 of 6 Question 8 i. ii. iii. iv. v. State Law of segregation in genetics. [1] Give the exact location of eustachian tube and mention its significance. [2] Explain in brief the process of urine formation. [2] With the help of an example describe chemotropism. [2] Draw a neat and labelled diagram of a plant cell containing 3 chromosomes in anaphase stage of mitosis. [3] Page 6 of 6

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