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PUNEST.HELENA" HIGH SCHOOL 2021 JANUARY PRELIMINARY EXAM. BIOLOGY (SCIENCE PAPER 3) Date: 10/02/2021 TIME:2 HRS. cLASS X M.MARKS: 80 allowed for writing the answers INSTRUCTiONS; The time given this paper is the time at the head of four questions from from section 1 and any all questions for questions Attempt or parts The intended marks are of questions section given in brackets[ Section- (40] marks from this sectio Attempt all questions QUESTION1 Name the following: AIThe 1] laver of the eyeball 2] A pair of corresponding parent 31 The compound 4 The number S] The wax like of that provides the eye. shaDe and sire and derived nourishment to chromosomes of the same one rom tac blood. combines with carbondioxide in formed when haemoglobin a human being chromosomes present in a nerve cell of layer on the transpiration. epidermis of leaves which reduces answer from each of 18 Choose the correct nerves in a human the four options given below; 15) are being 1)The number of spinal B) 10 pairs C 21 pairs D] 30 pairs A) 31 pairs 2) Aqueous humour is present between the Iris and lens C] Cornea 3] While recording the pulse rate, where exactly does A) Nerve B] Vein C)Artery D] Capillary 4 Amuscular wall is absent in A Lens and retina AF Capillary B] B] Venule C] Arteriole and iris D} Cornea and lens a doctor press on our wrist D] Vein 5] Chromosomes get aligned at the center of the cell during AJ Metaphase BJAnaphase C] Prophase D]Telophase C) Match the items given in column A with the most appropriate ones in column B and rewri S the correct matching pairs cOLUMN AA COLUMN B al hypersecretion of adrenal cortex 1]Cretinism 2]Diabetes insipidus 3]Exopthaimic goiter b] hyposecretion of thyroxine c] hyposecretion of growth hormone 4]Adrenal virilism d 5]Dwarfism el hypersecretion of growth hormone f hypersecretion of thyroxine hyposecretion of vasopressin [D]State whether the following statements are TRUE OR FALSE. If false, rewrite the correct statementS 1] Deafness is caused due to the rupturing of the pinna. 2] Gyri 3] and sulci are the A convex folds of cerebellum. lens is used to correct myopia. 4] White matter contains cell bodies of neurons. 5] Cochlea of the human ear is concerned with the sense of balance. E] Complete the following statement s t h e largest part of the bran 2) The cavities of the brain are ca are called middle ear are can e three small bones in the covering thne ere thin transparent membrane v he SJ Retina of vertebrate eye consists of Cet F) Define the following: 11 Osmosis 2] isotonic solution 3) Turgor pressure Transpiration 5] Wilting o State whether the foilowing are simple reflexes, or neither of conditional reflexes the tw 1] Sneezin8 2 Contraction of eya Pup 3] Knitting without looking 4] Playing on a musical instrument S] Applying brakes in your vehicle HI Name the eye defects caused due to each of the following ; 15] 1] Lens turns opaque 2] Uneven curvature of the cornea 3J Deficiency of vitamin A 4] Lens loses its flexibility 5] Lens becomes too flat. SECTION I (40 MARKS] Attempt any four questions QUESTION:2 TAJ There is a diagram representinga stage during mitotic cell division in [1 ldentify the 12) above stage. Give reason to an animal cell support your answer. labeled 1,2,3, and 4 Name the parts (3] What is the function of part 3 that comesjuSt (4) Name the stage this stage. diagram of arter n e stage shovwn in the diagram. And draw a well labe rBl (4] Write the names of four nitrogenous bases in a DNA molecule (21 Give reason why gametes have haploid number of chromosomes 31 State the significances of mitosis 2 UESTION:3 below a /TA The igure gven is diagrammatic representation of a part of the cross section15) of the root in the root hair zone. Study the same and then answer the questions that follow 1 Name the parts indicated by the guidelines 1 to 4 2) Which is the process that enables the passage of water from the soil into the roat hair 3]Namethe pressure that is responsible for the movement of water in the direction indicated by the arrow. Define it. a well labelled 4JDraw diagram of the root hair cell as it would appear if an excess of fertilizer is added to the soil close to it. [B) The diagram given represents a structure found in a leaf. Study the same and answer the questions that follow. 1JName the parts labelled A ANDDB. 2]What is the biological term for the above structure. 3]What is the function of the part labelled A 4]Mention two structural features of A which heip in the function mentioned in 5]Where is this structure likely to be found in a leaf. QUESTION :4 TA] State the exact location of the 1] Thylakoids 2] Chordae tendinae 3] Tricuspid valve 4]Pulmonary semilunar valve 5] Ear ossicles following structures G.3 1 Equalizes the in the ear, atmospheric pressure and pressure 2] Converts vibrations into nerve impulses. 3]Converts sound waves into mechanical vibrations. 4] 5] entry of dust particles into the ear. shape of the lens for viewing objects Prevents the Change the QUESTION:5 The IAI diagram given represents a at different distances. defect of vision of the human eye. 1] ldentify the defect. 2] Mention two reasons for the above defect. 3] State how the defect can be rectified. of the the shape eye Name the part of the eye responsible for maintaining this defect can be rectified. Draw a neat labelled diagram to show how 4] 5] B) Draw a neat and labelled diagram of a myelinated ball neuron QUESTION:6 found in the inner e= A]1] Drawa well labelled diagram of the membranous labyrinth each of the followina 2JBased on the diagram drawn above [1] give a suitable term for descriptions A] The sensory cells that helps in hearing. BJThe part that is responsible for static balance of the body. C) The membrane covered opening that connects the middle ear to the inner [B] State any five general properties of hormones QUESTION:7 [A] State any three differences between RODS and CONES cel State any two functions of aqueous humour [B] 14]State any three structural differences between arteries and veins (2] State any two main functions of capillaries. ear.
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