Page 1 : vit, , Sample Question Paper-5, , , , , , , , BIOLOGY, SCIENCE PAPER-3, Class-10, (Semester-l), Time allowed : One hour (inclusive of reading timo) Maximum Marks : 40, —, Same as Sample Question Papor-1, SECTION.|, (15 Marks), Question 1., Name the following by choosing the correct option: [5], (a) The longest stage in the cell cycle, 1. Interphase 2 Anaphase, 3. Metaphase 4. None of the above, (b) A trait that “overpowers” and hide another trait, 1. Overpowering trait 2. Complex trait, 3. Recessive trait 4. Dominant Trait, {o) The main site of photosynthesis, 1. Leaf 2 Stem, 3. Chloroplast 4. Guard cells, (4) The process by which roots of the plants absorb water from the sail,, 1. Diffusion 2. Transpiration, 3. Onenonis 4. None of these, (¢) The pores ina leaf through which respiratory exchange of pases takes place,, 1. Lenticels 2. Vacuoles, 3% Xylem 4. Stomata, Question 2., Complete the following statements by choosing the @ppropriate option for each blank: 15], , (a) Synapets is defined as the pairing of, , 1, Acentnie Chromosomes 2 Non-homolopous chromosomes, , 4 Homologous chromosomen, (b) The spindle apparatus is formed during the phase of Mitosis,, , 3. Any chromosomes, , 1, Telophiase 2 Metaphase, , 3. Prophase 4 Anaphave, () An individual's collection of genes is called, , 1, Genotype ie 2. Mhenotype, , a. Trait 4. None of the above

Page 2 : (d) The rate of transpiration will if the atmospheric pressure is low., 1, Increase 2. Decrease, 3, Stay unchanged 4, Can't be determined, (¢) The movement of materials from the leaves to other tissues of the plant is called __, 1, Tropic movement 2. Guttation, 3, Transpiration 4, Translocation, Question 3., Choose the correct answer from each of the four options given below: [5], (a) The optimum temperature for photosynthesis is, 1, 25-35°C 2. 10-15°C, 3, 35-40°C 4, 20-25°C, (b) Where does the light reaction takes place?, 1, Grana 2 Stroma, 3. Cytoplasm 4. Endoplasmic reticulum, (c) Living cells placed in an isotonic solution tend to retain their shape and size. This is based on the, principle of, 1, Diffusion 2. Transpiration, 3, Osmosis 4, None of the above, (d) The chlorophyll in photosynthesis Is used for, 1, Absorbing light 2 Breaking down water molecule, 3. No function 4. Reduction of CO,, (c) The movement of food In phloem is called ;, 1, transpiration 2. translocation, 3. respiration 4. evaporation, SECTION, (15 Marks), Question 4,, Explain the following terms: {5}, , (a) Variegated leaf, 1, Leaves which have no colour, 2. Leaves having some green and some non-green areas, 3. Leaves which do not show photosynthesis, 4, Leaves which have lost the capability to grow, (b) Photons, 1, Smallest unit of light energy, 2, Help in opening and closing of stoma, 3. Particles of sun which helps in transpiration, 4. They carry only red and blue colour of the visual spectrum, , (c) Exudation, 1. Process by which plants loose water in the form of water vapour

Page 3 : 2 Process by which plants loose water from injured parts :, 3. Process by which plants loose water along with dissolved substances directly in liquid form, 4. Process by which plants loose water and minerals from stomata, (@) Flaccidity, 1, Condition in which cell content is shrunken and the cell is no more tight., 2 State of cell in which cell wall is rigid and stretched by an increase in volume of vacuoles due, to absorption of water., 3. Condition in which the recovery or reversal of plasmolysis occurs in cells,, 4. State of cell in which the cell is half plasmolysed, (¢) Allosomes, 1. Chromosomes that determine general body features, 2 Chromosomes determining the sex of an organism, 3. Specific parts of chromosomes that determine hereditary characteristics, 4. A full complement of DNA of a chromosome of an organism, , Question 5., State the exact location of the following: (5), (2) Gametes, 1. Inside the sex organs of organisms 2. Inside the nucleus of a cell, 3. Inside the thylakoids of chloroplast 4. In the kidney of human beings, (t) Histones, 1._ In the Cloroplast of a plant cell 2. Inside chromatin network, 3. In the DNA 4. Inside nucleus of eukaryotic cells, (0) Genes, 1. In the margin of leaves 2 In the mesophyll cells, 3. In the DNA segment of chromosome 4. In the lower epidermis, (2) Guard cells, 1. In the Margins of leaf 2 Below Upper epidermis, 3. In the epidermis of leaves ‘ 4. Inside chloroplast, (¢) Root hair, 1. Extension of the cortex 2 Extension of epithelium, 3. Extension of epidermis 4. Extension of endodermis, Question 6., State the function of the following: BI, (2) Cuticle, , 1. Helps to increase the rate of transpiration, 2. Prevents evaporation of water from leaf surfaces, 3. Measures rate of water intake by a plant, 4. Helps in ascent of sap, , () Palisade cells ,, 1. Performs photosynthesis 2. Helps in transpiration, 3. Absorbs water from soil through roots 4. Stores energy for cell

Page 4 : (¢) Xylem, 1, Translocation of food from the leaves to the other parts of the plant., 2. Conduction of food., 3. Conduction of water and food,, 4. Conduction of water and minerals from the root to the other parts of the plant., (d) Selectively permeable membrane, 1. Allows useful substances to diffuse in and harmful substances to diffuse out of the cell, 2. Allows diffusion of both solute and solvent molecules through them, 3. Allows no diffusion of any solute and solvent molecules through them, 4, Allows no substance to pass through them, (c) Meiosis, 1. Production of four daughter cells, 2. Production of body cells, 3. Production of diploid cells for sexual reproduction, 4. Production of diploid cells for growth, repair and development, , SECTION-III, (10 Marks), , Question 7. i), The diagram shows drooping of leaves of Sensitive plant on touching. Answer the questions that follow:, , , , (a) The rapid drooping movement of this plant is an outstanding example of, 1. Guttation 2 Turgor movement, 3. Plasmolytic movement 4. Osmotic movement, (b) Why do the leaves droop when they are touched?, 1. Touch stimulus removes all water from the plant, 2. Touch stimulus develops electrical impulses, 3. Touch stimulus destroys the plant, 4. Touch stimulus leads to loss of turgor pressure at pulvinus, (c) Name this plant ’, 1. Mimosa pudica 2 Allium cepa, , 3. Solanums tuberosum 4. None of these, (a) What structures are called turgor operated valves?, 1. Nucleus 2 Guard cells, , 3. Thylakoids 4. None of these

Page 5 : (e) Turgor in root cells builds up which pressure?, , 1. Imbibition pressure 2. Osmotic pressure, 3. Root pressure 4. All of these, Question 8., The diagram represents internal structure of a root. [5], , , , (a) Label the parts 1 to 4., , 1. 1. Endodermis 2. Cortex 3. Epidermis 4. Xylem, 2. 1. Epidermis 2. Cortex 3. Endodermis 4. Xylem, 3. 1. Endodermis 2. Xylem 3. Epidermis 4. Cortex, 4. 1. Epidermis 2. Xylem 3. Xylem 4. Endodermis, (b) Initial stage for absorption of water is, 1, Osmosis 2. Endosmosis, 3. Imbibition 4. Diffusion, (c) Which pressure is built up due to root to root osmosis?, 1, Osmotic pressure 2. Suction pressure, 3. Root pressure 4. Turgor pressure, (@) Which ion maintains semipermeability of cell membrane?, 1. Calcium 2. Zine, 3. Potassium 4. Sodium, , (e) How many of the following are semi permeable membrane?, Visking bag, cellophane paper, egg membrane, muslin cloth, cell membrane, goats bladder, 1. Two 2. Three, 3. Four 4. Five