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ICSE Class X Prelims 2026 : Biology (Anand Niketan, Shilaj, Ahmedabad)

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Ankita Shah
Anand Niketan, Shilaj, Ahmedabad

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ANAND NiKETAN SHILAJ CAMPUS STD: X Date: 01/12/2025 Pre-Board IExamination (2025-26) Subject: Biology Maximum Marks: 80 Duration: 2 hrs Answer all questions in Section Aand attempt any four questions in Section B. Section Aconsists of objective typevery short answer questions. Section B consists ofshort and long answer questions. The intended marks for questions or parts of questions are given in brackets |} SECTION A 40 MARKS Question 1. Choose the correct option for the following questions : |15] (i) Asingle highly coiled tube where sperms are stored, gets concentrated and mature is known as (a) Vas efferentia (b)Vas deferens (c) Seminiferous tubule (d) Epididymis (ii) The nephrons discharge the urine into (a) Urinary bladder (b) Urethra (c) Renal pyramid (d) Renal pelvis (iii) The individual flattened stacks of membranous structures inside the chloroplasts are known as -(a) Grana (b) Stroma (d) Cristae (c) Thylakoids (iv) The mineral ion needed for the formation of a blood clot is: (a) Potassium (b)Sodium (c) Calcium (d)Iron (v) Astigmatismn can be corrected by: (a) Concave lens (b) Convex lens c) Cylindrical lens (d) both a and c (vi) Human sperms are produced in the testes. They possess a head region in which the nuclear material and acrosome are present. If a sperm lacked an acrosome, what would be the consequence? (a) The sperm willnot mature (b) Sperm will not be able to fertilise the egg (c) The resulting semen will be acidic (d) Sperm willpossess double the amount of nuclear material (vii) Observe the device as shown in the image and identify where it is placed in the female body. (a) Uterus (b) Ovary .(c) Vagina (d) Oviduct (vii) During a Biology lecture on the cellcycle that encompasses a series of events within a cell, the teacher asked: During which phase of the cell cycle, synthesis of RNA and proteins occur? Alka said, 'Gap 1phase', Raj said, Gap 2 phase', Mohan said, 'Synthetic phase Who is correct? J(a) Only Alka (b) Alka and Mohan (c) Only Mohan (d) Alka and Raj (ix) The posterior pituitary is the back portion of the pituitary gland that stores and releases hormones produced by the hypothalamus. If this part of brain is damaged due to injury or disease, which physiological function would be affected in the human body? (a) Maturation of reproductive organs (c) Retention of water in the body (b) Synthesis of TSH (d) Maintenance of normal body temperature Page 1of5 (N) Assertion (A) : involves the synthesis ofATP. plants. acts as the assimilatory power in Photophosphorylation Reason (R): ATP (c) Both A and R are false (d) Ais false and R is true (b) prevents the cancer cells (xi) Ria, who was battling cancer, received a chemotherapy drug that will doctors trom producing new DNA and proteins. During which stage of the cell cycle (a) Both A and Rare true A is true and R is false administer this drug to Ria? (a) G Iphase (b) G2 phase (c) Mphase (a) Sugar (b) NADPH (c) Oxygen and CO2 "(d) S phase (Ni) Which of thefollowing is formed during light dependent phase of photosynthesis? (d) CO2 (xiii) Which of the following statements accurately compares tubectomy and vasectomy? (a) Tubectomy and vasectomy are both surgical procedures performed on males to achieve permanent contraception. (b) Tubectomy and vasectomy are both surgical procedures performed on females to achieve permanent contraception. (c) Tubectomy is a surgicalprocedure that involves the cutting or blocking of the vas deferens in males , while vasectomy is a surgical procedure that involves cutting or blocking of the fallopian tubes in females. (d) Tubectomy is aprocedure that involves the cutting or blocking of the fallopian tubes in females,while vasectomy is asurgical procedure that involves the cuting or blocking of the vas deferens in males. (xiv) Assertion (A) : Haemophilia is an X-linked dominant character. Reason (R) : Haemophilic individuals lack a factor responsible for clotting of blood in the body. (a) Both Aand R are true (b) A is true and R is false (c) Both a and R are false .(d) A is false and R is true (xv) The corpus luteum plays a vital role in secreting the hormone progesterone, which is essential for maintaining the uterine lining and supporting the early stages of pregnancy. What happens to thecorpus luteum if the pregnancy does not occur? (a) It startsproducing lysosomes (b) It binds to the uterine membrane (c) It undergoes regression (d) It starts releasing oxytocin Question 2. Arrange and rewritethe terms in each group in the correct order so as to be in a logical sequence, beginning with the term that is underlined term: (i) Vagina, Ovary, Uterus, Oviduct, cervix Ovoy, dvl (ii) Pupil, yellow spot, Cornea, Lens, Aqueous humour o no Ad, pur, (iii) Oval window, tympanum, Cochlea, Auditory canal, Ear ossicles (iv) Renal vein, Renal artery, Affere t arteriole, Efferent arteriole, Glomerulus (v) Implantation, Parturition, Qvulation,Gestation, Fertilisation lns Question 3. Read the explanations given below andname the following: () The division of the nucleus of acell, Naryokins) (i) The layer of the eyeballthat forms the transparent cornea, sclea a (i1) The structure which connects the placenta and the foetus.umbili (iv) Apair of corresponding chromosomes of the same shape and size and derived, one from each parent. (v) The ear ossicle which is attached to the tympanum. taleu Page 2 of5 Question 4. Choose the odd one out from the the others belong: following terms and name the category to which i) Chlorophyll, mesophyll, Carotene, Xanthophyll (ii) Myopia, Cataract, Hypermetropia, Squint, Cretenism (iii) Cowper's gland, Urethral gland, Lacrimal gland. Seminal (iv) Insulin, Adrenaline, vesicles, Prostate gland Pepsin, (v) Phosphate, Centromere, Throxine Sugar, Nitrogenous base Question 5. Mention the exact location of the following structures: (i) Corpus callosum 51 (i) Chlorophyll (ii) Organ of Corti (iv) Cervix (v) Leydig cells Question 6. Study the diagram given below and fill in the blanks with suitable words: In order to prove that carbon dioxide is necessary for (a) a potted plant is placed in the dark for 48 hours to (b) the leaves. A part of the leaf is inserted into a conical flask containing potassium hydroxide solution. This is to absorb (c) from the flask. The plant is then placed in sunlight for a few hours. The experimental leaf is tested for starch. The part of the leaf that was inside the conical flask turns (d) areen whereas the part of the leaf outside turns (e)6jock in colour. SECTION B Wide mouth bottle [5] Split cork Pot plant KOH 40 MARKS Question 7. Answer the following questions: [1] [2 [2] (i) Expand the abbreviation: NADP (ii) Carbon monoxide is dangerous when inhaled in excess. Comment on the statement. (iii) Which parts of the ear are responsible for: (b) Dynamic equillibrium (a) Static equilibrium (iv) How is cerebrum different from spinal cord in case of arrangement of neurons? [2] 31 (v) Draw a neat, labelleddiagram of achloroplast. Question 8. Answer the following questions. (i) What is the roleof Sertolicells in the seminiferous tubule of the testes? (ii) Write any two functions of the placenta. (iii) The birth rate in India is very high." Mention two reasons in support of the statement. colour-blind son. have a (iv) A woman with normal vision marries a man with normal vision. They be Her husband dies and she marries a colour-blind man.Show the type of children that might expected from their marriage and the proportion of each. students to copy it in (v) A teacher drew the diagram of the heart on the blackboard and told the their notebooks. Mahesh couldn't see the diagram clearly as it appeared blurred to him. image formed. (a) Name the defect of the eye Mahesh is suffering from and where is the (b) Write any two possible reasons for the above defect. lenses to correct the defect. (c) Mahesh consults an eye doctor and is prescribed suitable Which type of lens should his spectacles have? Page 3 of5 [1| [2 [21 [3| E Question 9. Answer the following questions: (i) Twins may or may not be identical. Give a reason. (ii) Give a brief of stress hormone found in plants. (ii) Write two points of difference between Mitosis and Meiosis. (2) (iv) AS0 year old man, Mr. Johnson is experiencing frequent urination, especially at night, along (2] with fatigue and swelling in his ankles. |2) Upon examination, his doctor suspects a problem his excretory system. Mr. Johnson is concerned with how the excretory system functions and how it about his condition and seeks clarification on helps in maintaining overall health. (a) Name any two organs involved in excretion of wastes in the human body. (b) Define :Osmoregulation. (v) The diagram given alongside represents a system of the human body. Study the diagram and answer |3| the questions that follow : (a) Identify the system and name one hormone secreted by part 1. (b) Label the parts 2 and 4. (c) What is the function of part labelled 3? 6 Question 10. Answer the following questions: (i) Define :Population density. (ii) Write any two temporary methods of (iii) The mouth dries up and the heartrate contraception. (iv) Differentiate between: Auxins and increases during public speaking. Why this happens? Cytokinins (2 points ) (v) Given below is adiagram of the human ear. Study it and answer the question: Give the biological terms for the parts labelled 'A', 'B and 'C'. State the function of eachof these. [1] (2) (2| |3| Pinna Ear drum Question 11. Answer the following questions: (i) What is thigmotropism? () Give differences between the light reaction and dark reaction of photosynthesis based on the |1| [2] (iii) Mitosis differs in animal and plant cells. Give a reason. |2| site of reaction and the products formed. (iv) Give scientific explanation for the following statements: (a) Lawn grass is killed if salt is sprinkled on it. (b) Potato cubes when placed in water become fim and increase in size. (v) Draw a neat, labelled diagram of the nucleus ofa cell. with chromosome number 6, as it would |3| appear in the metaphase stage of Mitosis. Page 4 of5 Answer the following questions: (i) Gametes have a haploid number of chromosomes. Why? i) In acertain species of animals, black fur (B) is dominant over brown fur (b). possible ratio of genotype and Show he phenotypes of the offspring. (iii) Give the full form of DNA. State one point of difference betwyeen submetacentric and metacentric chromosomes. |1| [2] oblongata. (v) The diagram given alongside representsa developing human foetus in the [2] [3] Question 12. (2| (iv) Write one function each of the cerebellum and medulla womb. Study the same and then answer the questions that follow : 2 5 (a) What is the function of the part labelled 3? (b) What is amniocentesis? (c) Define gestation. 1 3

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