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VENKATESWAR ENGLISH MEDIUM SCHOOL UNIT IV, BHUBANESWAR SCREENING TEST- (2023-24) STANDARD - X Time : 2hrs Subject - BIOLOGY (F.M -80) The question paper is divided into two sections Section Ais compulsory carrying 40 marks and from Section B answer any 4 carrying 40 marks Section A Q1)Multiple choice (15) 1) The chromosomes are duplicated in (a) Gl phase (b) S phase (c) G2 phase (d) M phase 2)The point where two sister chromatids cross over is called (a) Chromatid (b) Centromere (c) Chaismata (d) Kinetochore 3) An organism that has two different alleles of particular gene (a) Dominant (b) Heterozygous (c) Homozygous (d) Recessive 4) The phenotype of an organism is (a) Combination of alleles (b) Genetic expression (c) Pedigree (d) Observable features 5)Genes are present on (a) Cell wall (b)Chloroplast (c) Chromosomes (d) Centromere 6)Marine fish when placed in tap water bursts due to (a) Endosmosis (b) Exomosis (c) Diffusion (d) Plasmolysis )The artery that supplies blood to all parts of the body. (a) Pulmonary artery (b) Aorta (c) Pulmonary vien (d) Superior vena cava. 8) Pacemaker of the heart (a) SAN (b) SNA (c) AVN (d )ANA 9) The rate of transpiration is inversely proportional to (a) Temperature (b) Sunlight (c) Humidity (d) Pressure 10)When guard cells are turgid the stomata must be (a) Closed (b) Dead (c) Open Page 1 (d) Neither closed or open habilis Homo Thrombin auricle (5) sequence. (5) lengthwise solution strand Darwin to (5) (d) Lamarck. Spleen.(d) Lamarck. (d) Bear for moth evolution (d) Cuticle(d) 5) 4) 3) 2) 1) Q4)Lymphocytes Mitral valve3) 2) 1) Q3) 4) fibres5) Centrosome 5) 4) 3 2) 1) Q2) 12) 11) 13) Homo Fibrin, SPulmonary Soil Spindle 15) Hydathodes 14) ) Stomata ( a ) phase, The The Factor Name (a) The The Industrial Guttation The The Mention (a) Blood (a) water,Arrange (a) repeating condition plantprocess ctus,Homosapiens, Platelets, first Carl origin Liver G2 Polar that the Mendel reservoir vien,Xylem, and scientist melanin in phase, Linnaeus the occur following which determines of bear of components exact ofengulfing species Thromboplastin,Fibrinogen, Left rewrite through cell Root ( of who Mitosis,GI Kidney ( b ) stomata b) Darwin(b) was (b) (b) ventricle,Aorta, function human placed Butterfly Lenticles fitness Darwin hair,Cortex the is proposed highlighted written bacteria Cro of in are terms body phase each of -Magnon, a according absent (c) (c) following. t h e hypotonic by t h e Heart ( c ) by in DNA (c) (c) Peppered Mendel by Left logical theory WBC 2 Hydathodes Wallace Q5 ) Mention exact location of the following, 1)Pulmonary semi lunar valve. 2) Aster 3) Lenticles 4) Centromere (5) 5)Chordae tendinae. Q6 ). Choose the odd one out from the following terms and name the category to which other belong I II. III. IV. V. (5) Chloroplast, cell wall, Large vacuole, Centrosome. Thymine, Cytosine, Guanine, Adenine ,Uracil Imbibition, Diffusion, Active transport, Osmosis Chlorophyll, Water, Transpiration, Sunlight Pericardium, Connective tissue, Muscular tissue, Pleural fluid Section B (Answer any four questions) Q1) () Define Plasmolysis. (1) (ii) Give one difference Mitraivalve and Aortic semilunar valve. (2) (ii)Loss of nucleus and mitochondria makes erythrocytes more efficient in function. (2) (iv) State two significance of transpiration. (2) (v) Draw a neat diagram of Anaphase of animal cell showing two pairs of chromosomes. (3) Q2) (1) (I) Define the term Mutation. (ii) State Mendel Law of Segregation. (ii ) Addition of salt to pickles prevents the growth of bacteria. Explain by giving two (2) (2) reasons. (iv) What is the significance of Hepatic portal vein? (2) (v) A homozygous tallplant (TT) bearing red flowers (RR) flowers is Crossed with a homozygous dwarf plant ( tt ) bearing white flowers (rr) (a) Give the possible combinations of the gametes that can be obtained from the Fl hybrid (b) Give the dihybrid ratio and the phenotype of the off springs of F2 generation When two plants of the Fl generation are crossed by a Punnett square. (3) Q3) (1) (I) What is Neo -Darwinism? Page 3 () What is the difference between mitosis in animal cell and plant cell? (2) (iii) Name two genetic disorders in men (2) (iv)Mention any two adaptations found in plants for transpiration (v) The diagram shows a cell kept in sugar soluticn (2) 4 (a) What scientific term is used for the changes as shown above? Define it (b) What should be done to restore the cell back to its original condition? (3) (c) Give the scientific term for the recovery of the cell as a result of the step taken above Q4) () Define diapedesis (1) (ii) What is the significance of meiosis? (2) (ii)Why does the blood vessels not clot? (iv)Differentiate between Guttation and Bleeding. (2) (2) (v) The diagram given below represents a section of the human heart. Answer the following questions (a) Which parts of heart are in the diastolic phase? Give reason to support your answer (b) Label the parts numbered 1and 2in the diagram. What type of blood flows through them? (c) What causes the heart sounds Lubb and Dubb? (3) Q5) (I) what is a dihybrid cross (1) Page 4 (ii). Differentiate between Active transport and Diffusion. (111)The left ventricle of the heart has a (2) thicker wall than the right ventricle Give reason. () (iv) Why the plants in fertilized soil wilt if the soil is not adequately watered? (V) Examinethe diagram below and answer the following questions. (a) Identify the phenomenon given in the picture. (b)Write the scientific name of the insect which was involved in the phenomenon (c) Which moth population was more post industrialization light or dark? Give an explanation? (3)
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