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ICSE Class X Prelims 2024 : Biology

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Subrata Kundu
Arambagh Vivekananda Academy, Hooghly

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1 Biology FM 80 SECTION I (40 Marks) Attempt all questions from this section Question 1 (a) Name the following: [5] (i) Process of conversion of several molecules of glucose to one molecule of starch. (ii) The type of lens used to correct myopia. (iii) The stage in which separation of sister chromatids takes place. (iv) The hormone that stimulates the entire sympathetic nervous system. (v) The division of kidney which is light in colour and subdivided into conical renal pyramids. (b) Explain the following terms: [5] (i) Reflex action (ii) Plasmolysis (iii) Diapedesis (iv) Pulse (v) Photophosphorylation (c) Choose the correct answer from the options given below: [5] (i) After mitotic cell division, a male human cell will have: A. 44 + XX chromosomes B. 44 + XY chromosomes C. 22 + X chromosomes D. 22 + Y chromosomes (ii) If we spray phenyl mercuric acetate on the surface of leaves, it will result in: A. Increase respiration B. Increase photosynthesis C. Reduce transpiration D. Reduce respiration (iii) The organ of corti is located on which membrane of ear: A. Basilar membrane B. Tectorial membrane C. Tymphanic membrane D. Reissner s membrane (iv) A 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 (v) The common passage for sperm and urine in the male reproduction system is: A. Ureter B. Seminal vesicle C. Urethra D. Vas deferens (d) Give the exact location of the following: [5] (i) Corpus callosum (ii) Iris (iii) Thyroid gland (iv) Pulmonary semilunar valve (v) Organ of Corti (e) State the main function of the following: [5] (i) Cerebrospinal fluid (ii) Lenticels (iii) Vitreous humour (iv) Medulla oblongata (v) Ureter (f) Write the category and the odd one out [5] (i) Haemoglobin, Glucagon, Iodopsin, Rhodopsin Time 2 hours (ii) Urethra, Uterus, Urinary bladder, Ureter (iii) Transpiration, Photosynthesis, Phagocytosis, Guttation (iv) Cyton, Photon, Axon, Dendron (v) Oxytocin, Insulin, Prolactin, Progesterone (g) Differentiate between the following pairs on the basis of what is mentioned within brackets: [5] (i) Turgor pressure and wall pressure (explain) (ii) Bowman's capsule and Malpighian capsule (parts included) (iii) Leaf and liver (form in which glucose is stored) (iv) Cerebrum and spinal cord (arrangement of neurons) (v) Cranial and spinal nerves (total number in adults) (f) Complete the following table by filling in the numbered blanks with an appropriate term/answer: [5] Gland Hormone Function produced Thyroid 3. 1. Vasopressin 2. 4. 5. 6. Adrenal medulla 9. 7. Promotes glucose utilization by the body cells. 8. Oestrogen 10. SECTION II [40 Marks] Attempt any four questions from this section Question 2 A. Answer the following questions: [5] (i) Mention three significant changes that occur in a cell during interphase. (ii) What is the importance of chiasma formation? (iii) What is the difference between chromatin fibre and chromosome? (iv) Meiosis maintains the chromosome number in a species constantexplain. B. Study the diagram given below which represents a stage during mitotic cell division and answer the questions that follow: [5] 2 Biology FM 80 (i) Identify the stage giving suitable reasons. (ii) Name the parts numbered 1 and 2. (iii) What is the technical term for the division of the nucleus? (iv) Mention the stage that comes before the stage shown in the diagram. Draw a neat and labelled diagram of the stage mentioned. Question 3 A. The diagrams given below are cross sections of blood vessels: [5] (i) Identify the blood vessels A, B and C. (ii) Name the parts labelled 1 to 3. (iii) Name the type of blood that flows through A. (iv) Mention one structural difference between A and B. (v) In which of the above vessels does the exchange of gases actually take place? B. Differentiate between the following pairs on the basis of what is given in brackets: [5] (i) Lymphocytes and Neutrophils (Structure of the nucleus) (ii) Tonoplast and plasma membrane (Position) (iii) Prostate gland and Cowper s gland (The nature of secretion) (iv) Rod cells and Cone cells (Pigment) (v) Simple goitre and exophthalmic goitre (Cause of the disorder) Question 4 A. Given below is a diagram depicting a defect of the human eye, study the same and then answer the questions that follow: [5] Time 2 hours (i) Name the defect shown in the diagram. (ii) What are the two possible reasons for this defect? (iii) Name the type of lens used to correct this defect. (iv) With the help of a diagram, show how the defect shown above is rectified using a suitable lens. B. The diagram below represents a process in plants. The setup was placed in bright sunlight. Answer the following questions: [5] (i) Name the physiological process depicted in the diagram. Why was oil added to the water? (ii) When placed in bright sunlight for four hours, what do you observe with regard to the initial and final weight of the plant? Give a suitable reason for your answer. (iii) What happens to the level of water when this setup is placed in 1. Humid conditions 2. Windy conditions. (iv) Mention any three adaptations found in plants to overcome the process mentioned in (i). Question 5 Give scientific reasons for the following: [5 x2] (i) Pancreas is an exocrine as well as endocrine gland (ii) It is necessary to place a plant in the dark before doing an experiment. (iii) Wooden frames of doors get jammed during the monsoon season. 3 Biology FM 80 (iv) A person walks unsteadily when drunk. (v) When the temperature is high transpiration also goes high. Question 6 A. The diagram below represents the human heart in one phase of its function. Study the diagram carefully and answer the questions that follow: [5] (i) Name the phase. (ii) Which part of the heart is contracting in this phase? Give a reason to support your answer. (iii) Name the parts labelled 1 to 4. (iv) What type of blood flows through 2 ? (v) State the function of the part numbered 5 . B. Give scientific reasons for the following: [5] (i) The oxytocin hormone is administered to pregnant women. (ii) The rate of photosynthesis is low at high temperatures. (iii) Farmers sow seedlings in the evening. (iv) Throat infection can lead to ear infection. (v) Veins contain valves in their inner walls. Question 7 A. The diagram given below is a representation of a certain phenomenon pertaining to the nervous system. Study the diagram and answer the following questions: [5] (i) Name the phenomenon which is being depicted. (ii) Give the technical term for the point of contact between the two nerve cells. (iii) Name the parts 1, 2, 3 and 4. (iv) Write the functions of parts 5 and 6 Time 2 hours (v) How does the arrangement of neurons in the spinal cord differ from that of the brain? B. Give scientific reasons for the following statements: [5] (i) Why does blood not clot in circulation? (ii) Why we cannot distinguish colours in moonlight? (iii) When are the sounds "LUBB" and "DUP" produced respectively during heart beat? (iv) Why is iodine as a nutrient, important to our body? (v) Why Balsam plants wilt during mid-day even if the soil is well watered? _________________ XXXXXX _____________

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