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RYAN GROUP OF SCHOOLS ACADEMIC YEAR 2024-25 ICSE, FIRST PRE BOARD STD: SUB: EXAMINATION RYAN MARKS: 80 DURATION: 2 HRS BIOLOGY SECTION A 140 MARKS. (Atempt all questions) Q1. Select the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only) 1. Hydathodes are located on a. At the petiole c. Lower surface of leaves b. Upper surface'of leaves d. margins of leaves valves are located at the opening of the right ventricle into the pulmonary artery. a. Pulmonary semilunar b. Aortic semilunar c. Tricuspid d. Bicuspid 3. The first scientist who proposed his theory for evolution was a. Darwin c. Mendel b. Lamarck d. Wallace 4. In the human menstrual cycle, the ovulation occurs around: a. 7 days b. 14 days c. 21 days d. 28 days 5. The external female genitalia is called a. Uterus c. Vulva b. Vagina d. Ovary 6. A gland which sccretes enzymes and hormones both is a. Adrena! c. Thyroid STD: X ICSE b. Pancreas -2 d. Pituitary 7. The deficiency of GH inchildhood results in a. Gigantism c. Dwarfism b. Goitre d. Addison's discase 8.Chlorophyll is located in a. Stroma c. Stoma b. Thylakoid d. Fret 9. Apical dominance is influenced by a. Gibberellins c. Cytokinins b. Ethylene d. Auxins 10. The main nitrogenous waste formed in the human body a. Uric acid c. Urea b. Ammonia d. Creatinine 11. The process of tubular secretion occurs in a. PCT C. DDT b. DPT d. DCT 12. The white matter of cerebrum mainly consists of a. Cytons c. Axons b. Dendrons d. Dendrites 13. Tears have an antiseptic property due to the presence of a. Lysosome c. lysozyme b. Aqucous humour d. Vitreous humour 14. The spiral organ possessing sensory cells for hearing is a. Ampulla c. Vestibule BI STD. N ICSE h Semcinular Canal BIOLOGY d. Organ of Corti 15 Assertio: (4) The innemost highly vascular membrane of thebrain, richly suypliad with blood is pia mater. Reason: (R) A nerve may be compared to an underground electric cable containing numenuS COnducting wires, cach insulated from the other. a Aand R both are true statements but R is not the correct explanation of A b. A is true and R is the correet explanation of A. c. Both Aand R are false. d. None of these. Q2. 1. Name the following [5) a Phenotypic Dihybrid ratio in F2 generation. b. The type of bond which joins the complementary Nbases. e. The process by which molecules distribute themselves evenly within the space they occupy. d. A biomedical waste. e. An intra-uterine device. 2 Give the function of the following a. Ethylene hormone in plants. b. Eosinophils c. Kidney d. Cone cells of the eye e. Amniotic fluid 3. State whether the following statements are true or false. Also correct the false statements a. Asingle DNA molecule is very large, and henwe it is deseribed asa aeromolecule. [5) -4 ICSE STD: X into a starch The process of conversion of several glucose molecules BIOLO, molecule is called polymerization. c. Transpiration directly from the surface of the leaves and stems is called lenticular transpiration. d. Population grows by arithmetic progression, and production of food rises by geometrical progression. e. The fine particles (sulphates, nitrates) degrade visibility and harm the human health. 4. Match the items given in column Iwith the most appropriate ones in column II and rewrite the correct matching pairs. Column [5) Column II a. Haemophilia i. First man like ancestor. b. Cell bursts ii. Solution outside is hypotonic ii. Solution outside is hypertonic c. ABA d. Monocytes iv. Genetic disorder e. Homo habilis v. Stimulates closure of stomata vi. Largest of WBCs 5. Choose the odd one out from the following terms and name the category to which the others belong. [S] a. Grasshopper, rabbit, rat, snake b. ACTH, Oxytocin, GH, FSH c. Pinna, wisdom teeth, eyes, vermiform appendix. d. Vasectomy, condom, diaphragms, spermicidal agents. e. Cholera, asthma, jaundice, typhoid. SECTION B (40 MARKS) Atempt any 4 questions from this Section STD: X ICSE BIOLOGY Q3. 1. State any one function of Centromere. 2. Distinguish between the following pair. [) (2] a. Karyotype and Karyokinesis 3. Give reason- If you uproot a plant from the soil, its leaves soon wilt. (2] (2] 4. Explain any two adaptations in plants to reduce excessive transpiration. 5. The figure given above is an organ system of humans. Observe the same and answer the following questions (3] 4 3 a. ldentify the organ system. b. Label the part numbered 1 c. Write one important role of part 3 Q4. 1. State any one application of Mendel's laws. 2. What is the site of synthesis of Auxins and Gibberellins? [2) 3. Draw a neat and a labelled diagram to show structural difference between artery and vein. 4. Add a note on Survival of the fittest. [2] [2] 5. The given diagram shows a section of the human brain and its associated parts. Answer the questions. (31 STD: X ICSE BIOLOGY -6 a. Name the parts labeclled 1,2 b. Name the basic unit of the brain. c. Write the function of part I -2 Q5. 1. Write the full form of CNG. 2. Mention two reasons for the rapid increase of population in India. Why is insulin not given orally but is injected into the body? Where is the location of pancreas? [2] [2] 4. Draw a neat and a labelled diagram of the phase that comes after anaphase in animal cell. (mitosis) [2] 5. The given figure above represents a kidney tubule in humans and its blood supply. Observe the figure and answer the questions. Write specific name and numbers shown in the diagram for each answer. a. Name the part which consists of aknot-like mass of blood capillarics. b, What is the specific name for the combination of parts shown as 5 and 3? c. Where is the most water reabsorbed? (3] ICSE TD:X -7 BIOLOGY ahat would a child suffer from if there was hyposccretion from his thyroid? [1] Gve reeason- Forests tend to bring more rains. 2 .iNe any two functions of placenta. (from mother to the foetus) (2] ahat are the common sources of oil spills? How do they affect sca life? (2] iven alongside is a diagram depicting a defect of the human eye. Observe same andanswer the given questions. [3 Name the defect shown in the diagram :Give one possible rcason for this defect. Name the part labelled I significance of 1. Explain any one [) mitosis. recessive traits. [21 with their dominant and pea garden of features . List any two steps of photochemical 3. Explain the two main phase in short. 4. Explain the term a. Hydrotropism b. Thigmotropism setup in figure and then answer 5. Study the experimental A suCROSE wAECULES 55 SUCAOSE SOLUTION WATER MOLECULES SEMI PERMEARLE VEMBRANE [2] (21 the given questions, [31 STD: X ICSE BIOLOG a. What phenomenon is being studicd by this set up? b. What is meant by semipermeable membrane? c. What will vou observe in the set up after about half an hour? Give a reason tor vour answer. Q8. 1. State any one precaution in the use of potometer. 2. Differentiate Active transport and Diffusion movement of molecules) (concentration gradient. [2] 3. What is meant by the tem Double Circulation'? [2] 4. Explain natural reflex and give one example. (2] $. Given below is the diagram of an experimental set-up (final stage). Study the same and answer the following questions. [3) OXYGEN GAS GAS BUBBLES SUNLIGHT TEST TUBE FILLED WITH BEAKER WATER CONTAINING -FUNNEL WATER HYDRILLA PLANT TWIGS a. What is the main aim of the b. Oxygen gas shown in materials? experiment? the experiment is released from which of the raw c. How would you confim the presence of oxygen gas?
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