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SRI SRI ACADEMY CLASS X (BIOLOGY) PRE BOARD EXAMINATION SESSION 2015-2016 TIME: - 2 HRS GENERAL INSTRUCTIONS MAX MARKS:- 80 Answer to this paper must be written on the paper provided separately. You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing answers. Attempt all questions from Section I. Answer any four questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION I (40 Marks) Attempt all questions from this section. Question 1. (a) Name the following: (i) Phase of interphase where DNA duplication takes place. (ii) Aggregation of cytons and unmyelinated dendrites in brain and spinal cord. (iii) Mucous membrane lining the uterus. (iv) The region of retina with the sharpest vision. (v) Condition in which both genes controlling one character are similar. [5] (b) State the main function and exact location of the following: (i) Guard cells. (ii) Glomerulus. (iii) Auditory nerve. (iv) Chordae tendinae. (v) Vagina [5] (c) Differentiate between the following pair of terms on the basis of criterion given within the brackets :[5] (i) Plasmolysis and Deplasmolysis (Type of solution). (ii) Phenotypic and Genotypic ratio (Monohybrid Cross) (iii) Light and dark reaction (Site of occurrence) (iv) Gestation and Parturition (Definition) (v) Cranial and Spinal nerves (Type / Nature) (d) State whether the following statement are true or false. If False rewrite the correct form of the statement by changing either the first or last word only :[5] (i) Muslin cloth is a freely permeable membrane. (ii) Dominant gene expresses only in homozygous condition. (iii) Testes descend in inguinal canal prior to birth. (iv) Organ of Corti is called the organ of balance. (v) Blood flows with great pressure in the efferent arterioles. P.T.O (e) Given below are five sets of five terms each. In each case, rewrite the terms in correct order so as to be in a logical sequence: [5] (i) (ii) (iii) (iv) (v) Pupil, Yellow spot, Cornea, Lens, Aqueous humour (Path of entry of light into eyes from an object). Endodermis, Cortex, Soil water, Xylem, Root hairs (Absorbtion of water by the plants). AV node, SA node, Contraction of ventricle, Purkinje fibers, Bundle of HIS. (Ventricular contraction). Water molecules, Oxygen, Grana, Hydrogen and hydroxyl ions, Photons. (Stages of light reaction). Renal vein, Renal artery, Afferent arteriole, Efferent arteriole, Glomerulus (Pathway of blood through glomerulus) (f) There are five sets consisting of four terms given below. In each set a term is odd one and cannot be grouped in the same category to which the other three belong. Identify the odd one in each set and name the category to which the remaining three belong:An example is given below: [5] Example: (0) Cell wall, vacuole, centrosome, plastids, mitochondria. Answer: Sl.No Category Odd one 0 Organelles of Plant Cell Centrosome (i) Sneezing, Blinking, Coughing, Typing. (ii) Ovary, Uterus, Vas deferens, Vagina. (iii) Oxygen, Glucose, Water, NADPH2. (iv) PCT, DCT, Glomerulus, Loop of Henle. (v) Utriculus, Saccules, Aqueous humor, Auditory canal. (g) Give biological reasons for the following:-. (i) Renal cortex is darker than renal medulla. (ii) Retina is a photosensitive layer of the eye. (iii) Nerve impulse travels in unidirectional way. (iv) Weeds are killed by adding salts. (v) Root hair is adapted to absorb water from soil. [5] (h) Give the biological / technical term for the following:(i) The process by which leucocytes crawls out from thin capillary walls. (ii) Membrane that protects the foetus and secretes a protective fluid. (iii) The immediate product of photosynthesis. (iv) Blood plasma without clotting factors. (v) Adsorption of water by surface attraction. [5] P.T.O SECTION II (40 Marks) Attempt any four questions from this Section. Question 2. (a) Answer the following questions:(i) Name two Y linked traits in humans. [1] (ii) Name the nitrogenous bases found in DNA and RNA exclusively. [1] (iii) A normal visioned woman marries a normal visioned man. They have a colour blind son. How can it be explained? Use Punnet square to substantiate your answer. [3] (b) Define the following terms: (i) Polymerisation (ii) Phenotype (iii) Eutrophication (iv) Plasmolysis (v) Mutation. Question 3. (a) Study the diagram given below and answer the question that follows: (i) (ii) (iii) (iv) [5] [5] Identify the above stage. Give a reason to support your answer. Name the parts labelled 1, 2, 3 and 4. What is the function of part labelled 3. Name the stage that comes just after this stage in the diagram. Draw a neat labelled diagram of that stage. (b) A heterozygous tall pea plant is crossed with a homozygous dwarf pea plant. With the help of a Punnett square, show the parents and their offsprings Phenotypes and Genotypes [3] (c) A haemophilic man marries a carrier woman. Obtain phenotypes and genotypes of offsprings using Punnett square. [2] P.T.O Question 4. (a) Study the diagram given below and answer the following:- (i) (ii) (iii) [5] Name the parts labeled 1 to 4. What is the function of 1 and 3. Which part in the diagram is endocrine in nature. (b) Give Scientific reason for the following statement: [5] (i) Males are more susceptible to X linked defect. (ii) Vitamin K is called as anti hemorrhagic vitamin. (iii) Hanging by rope around neck causes instantaneous death. (iv) Veins are provided with valves. (v) Chances of pregnancy to be occurred on the 14th day of the menstrual cycle. Question 5. (a) Answer the questions that follows : [5] (i) Mention two adaptations found in xerophytes to reduce loss of water due to transpiration. (ii) Mention any two differences between Endocrine glands and Exocrine glands. (iii) Expand NADP and BCG. (iv) What is the marriageable age by law for boys and girls in India? (v) Give one example of : 1) Main pollutant responsible for Green House Effect. 2) An antitranspirant which acts as fungicide. (b) Name the duct or passages that leads from: [3] (1) Ovary to Uterus. (2) Pinna to eardrum. (3) Urinary bladder to Outside. (4) Uterus to Outside. (5) Middle ear to Pharynx. (6) Epididymis to Ejaculatory duct. (c) Name the fluid for the following cases: [2] (1) Protects and nourishes the brain. (2) Filters out into the Bowman s capsule under pressure. (3) Protects the developing embryo. (4) Helps to maintain the shape of the eyeball. P.T.O Question 6. (a) The figure given below represents a plant physiological experiment. The alphabet A represents a certain condition inside the flask: [5] (i) (ii) (iii) (iv) What is the aim of the experiment? Identify the special condition inside the flask Name an alternative chemical that can be used instead of the chemical present in the conical flask. In what manner do the leaves 1 and 2 differ at the end of the starch test? (b) Study the diagram and answer the question that follows:- (i) (ii) (iii) (iv) (v) [5] Define the process shown in the above diagram. Will the level of sugar solution in the thistle funnel rise or fall? Give reason to explain your answer as mentioned in question (ii) above. Give two utility of this process to plant. State one main difference between this process with the diffusion process. P.T.O Question 7. (a) A diagrammatic representation of the internal structure of an organelle found in plant cell shown. Answer the question that follows: [5] (i) (ii) (iii) (iv) (v) (b) Identify the cell organelle. Name the physiological process occurring in this organelle. Mention one way in which this process is beneficial to man. Name the phases of the process occurring in parts labelled 1 & 2. Represent the physiological process mentioned in question (ii) above in the form of a balanced chemical equation. Draw a neat labelled diagram of the following: - (Any two) [At least five labellings to be given for each diagram] (1) A matured mammalian male gamete. (2) Mitotic anaphase in Animal cell with chromosome number 4. (3) Membranous labyrinth. -------------------------------------xxxxxxxxxxxxxxx-------------------------------------- [5]
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