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ICSE Class X Prelims 2026 : Biology (Vibgyor High School, Airoli, Navi Mumbai)

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Sample Paper Biology Grade: X Max. Marks Dato : dd/mm/2024 Tlme Allowed: 2 hour : 80 INSTRUCTIONS: Answers to this paper must be wrltton on tho paper provided soparatoty. You wlll not be allowed to wrlto during tho first 15 mlnutos. This time ls to be spent In reading the question paper. Tho tlmo glvon a t the head of this paper ls the time allowed for wrll/ng tho answers. Soctlon A Is compulsory. Attompt any four questions from Section 8 Tho lntvndod marks for tho quosrlons or parr11 of quostlons aro glvon In tho ( J, SECTION A (40 Marks) {Attempt all questions from this Section A) Quo1t!on1 Choose tho correct answers to iho questions from the given options (Do not copy the question, write the 00fT8CI answers only.) (I) The structure ol DNA was g1110n by: (a) Gregor Johann Mendel (b} Watson and Cncll (c) Roben Hooke (d) Charles Darwin (II) Dissimilar pair of alleles. (a) Homozygous (b) Homologous (c) Ho1arozygoua 1 V 11 !I'll.I Y O R (d) Heterogamy [15) ) cu '-#' o, sc..oc, .. (d) Heterogamy (iii) Which of lhe folowing phenomena leads to swetling of a cell? (a) Pha~osis (b) Endosmosis (C) Exosmosis (d) Ptasmolysls is not a sen,i.pefmeable membrane. (iv) (a) Goat's bladder (b) Cellophane paper (c) Muslin doth (d) Vtsking s bag (v) Which one of lhe folowing Is a characteristic NOT related with the suitability of the roots fOf absorbing water? (a) Tremendous surface area (b) Contain cell sap at higher ooocentration than the surrounding water (c} Root hairs have lhin cell waits (d) Grow downward into the soil (vi} Rate of phorosynthes,s ts maximum in (a) red and blue light (b) blue and yellow light (c) green light (d) \11t\lte light (vii} Oxygen liberated during photosynthesis comes from (a) carbondloxide (b} water (c) phosphoglyceric acid (d) chlorophytl (viii) The hormone which is In a gaseous state at ordinary temperature. 1 9 9 a p p p G~OVI" OF SCMOOLh (a) Gi>berelins (b) Ethylene (C) Auxins (d) Cytokinins (i,c) The stress hormone in plants which functions during a drought Is: (a) Auxins (b) Abscisk: acid (c) Ethylene (d) Cytokinins ( ) A 8tology teacher asked her students to give the name of two hormones S8Cf8ted by anterior pituitary. Sam said: GH and LH Adi said: Insulin and GH Lara said: LH and o,cytocin Jal said: TSH and LH Who were oorrad? (8) Sam and Jai (b) Adi and (C) Lara and Jai (d) Adi and Lata Sam (xi) Guttation takes place through special structures on the leaves called: (a) Hydathode (b) Stomata (C) lentk:el (d) Cutide (xii) Alaertlon: Fertilization results in fonnation of zygote. Renon: Zygote divides severm times to fOffll an embryo. (a) Both A and R are true and R explains A (b) Both A and Rare true and R does not explaJn A (c) A is true and R is False (d) A Is false and R is True 3 tJI (,clil) During a practical exam, a plant eel In a particular solution was placed under a compound microscope. Students were told to observe the eel and name the tonicity of the solution and mention the process that occurred in the cell. (a) lsotoric, Endosmosls (b) Hypotonic, Active Transpoft (c) Hypertonic, Endosmosls (d) Hypertonic, Exosmosis (xiv) AsNrtlon (A): The foetus respires but does not breath. RHSOn (R):The maternal blood supplies oxygen to the foetus through placenta (a) A Is true and R Is False (b) A is false and R is True (c) Bolh A and R are True (d) Both A and R are False (xv) An endocme gland x- secretes a hormone glucagon. Identify the endocrine gland x and the function 'Y' of gtucagon In ttle human body: gtycogen into glucose (a) X; Adrenal gland; Y: Stimulates breakdown of (b) X: A~enal gland: Y: Stimulates deposition of glucose into glycogen (c) X; Pancreas; Y: Stimulates breakdown of glycogen into glucose (d) X: Pancreas; Y: Stimulates deposmon of glucose in10 glycogen Qu11don2 Answer the folowtng queationa. (i) Name the following: (a) The basic units of heredity. (b) The wax Mke layer on the epidermis of leaves which reduoes transpiration. (c) One internal factor which affects the rate of transpiration. (d) A growth-retarding hormone In plants. (5) 4 mi s , , Gll "9' 06 l i ~ (e) The hormone loc.ated at the apical meristem. (ii) Arrange and rewrite the terms In each group In the conect order so as to be In (5) a logical sequence beginning with the tenn that Is underlined. (a) Gene. genome. chromosome, nucieotide (b) Water vapour, Soll water, Leaves, Ascenr of Sap (c) Washed in water, deS48{Ched ~ pac,d kl sunlidlt. iodine added, a leaf boiled in aleohol (d) lmplantalioo, partUrition. fertJ1jzation, gestation (e) Sperm duct, Semlnfferous tybyle. Epkidymls, Efferent duets. (iii) Fill in the blanks with suitable words. (5) Absorption ol mineraJ a4aments from the soll lnvotvas _ _ _ _ _ _by the Cefls. Minerals may also be absolbed as ions rather than as sal1s. The dilute Solution ol water and_ _ _ _, absorbed from the soil by the - - - - can be used for food manufacture in the _ _ _ _ _ _ only if it can travetr:ut:tutb ,. up 10 the highest points of the plant This upward flow occurs through the_ __ (iv) Read the explanations given bek>w and name the structure: Example: The largest gland In the human body that secretes bile. Answer: LiY9f (a) The point ol attachment of two chromalids of a chromosome. (b) The phenomenon by whk:h the living or dead cells absort> water by surface attraction. (c) The plant hormone induce parthenocarpy. (d) The condition which resul1s In abnormaJly long bones, long lower jaw bone due to the hyposecretion of a pituitary hormone. (e) The canal through which the tesies descend down Into Iha scrotum just before the blnh ol a male baby (v) Match the items glV8fl In cohnn I with the most appropriate ones in colurM II and rewrite the correct matching pajrs. Cofumn I Cotumn II (I) Light reaction. (a) Glucose (Ii) Stroma (b) Olapedesis 5 (5) m 0 111~ o, (Iii) KOH (c) Fluid flfled space fIV) Starch test (d) Thylakoids (v) Datk reaction (e) absorbs Carbondloxide ,fl J:J SCJtOOl.S (f) Iodine (g) Phagocytosis SECTION B (A,.,,.,,, any four qwsdons from fin MCflon) Quntlon3 (i) Define plasmotysis. (1) (Ii) State Menders Law of independent assortment. (2) (IW) Rajesh is a farmer who has a vineyard and cultivates grapes. To improve the st.ape of the grapes and make them elongated he sprays a partic\Jlat (Zl r.J phytohormone at the time c:A fruitrlng. (a) Name the phytohormone that Rajesh sprays on the plant at the time of fruiting. (b) These grapes are said to be seedless. What is the technical term for the formation c:A such fruits? flV) Mention any one difference between cretinism and myxoedema. (2) (v) Draw a neat and well labelled ciagram c:A the chloroplast. (3) (i) Expand the abbreviation-ACTH. (1) (ii) Draw a neal labelled diagram c:A a single stoma (2) Questlon4 (IW) Differentiate between autosomes and sex chromosomes. (2) (iv) The figure given below depicts a kind c:A tropic movement in plants. Study the (2) same and answer the following questions. 6 al ' D l ;i I.II~ OI' $CMOOI..$ (a) What kind of a movement is shown in figure. Define it. (b) Name one stimulus whk:h gives a poslttve response for the roots but negative response for the shoot. (v) Draw a neat, labelled diagram of .a human spenn. (3) (f) Explain the term Guttatlon. (1) (ii) The (jagram given bek>w represents a system in the human body. Study the Queltlon 5 diagram and answer the folowlng questions: 2 t:I 5 (a) ldentWy the system. (b) Name the two hormooes secreted by 1. (iii) Observe the <iagram given bek>w and answer the following questions. 7 (2) (a) Define the type of Tropism shown In the diagram. (b) Name the instrument used 10 study the process In the laboratory. (iv) The dagram given below represents an endocrine gland In the human body. (2) Study the cfaagram and answer the f~lowing questions: lnfu:ndibulum - --HAnterior lobe luterior lobe- - (a) ldentWy the endocrine gland. (b) Name one hormone secreted by the posterior lobe of the gland (v) Draw a neat. labelled diagram of an animal cetl showing metaphase with four [3) chromosomes.. Question I (r) State the exact location of Thyroid gland. (ii) Oifferentia1e between tut>eaomy and vasectomy. (iii) (iv) Draw a neat labetJed diagram of cross section of adrenal gland. Give reason: chlorophyll essential for photosynthesis. [2] (v) Draw a neat. labelled diagram of a root halr. [3) Question7 8 db tl i ;i GIIOU- 01 $C:l'OOL$ (i) Define the tenn pofymerization. (1) (ii) Give reason- the scrotum located outside the abdominal cavity in males. (2) (iii) Distinguish between Dsabetes memtus and Diabetes insipidus. (2) The diagram shows a segnent d DNA that codes fOJ a prottrin. Observe the diagram and answer the questions that follow. OGl-00 riv> a-- -00 Oo-- -00 o- ~ (2) QD ~ a-- -00 Oo-- -00 (a) What Is the tenn given to such a segment as descrl>ed above? (b) Write the number d Adenine Thymine pairs and Cytosine-Guanine pairs seen In thls segment (v) The clagram of an apparatus given below demonstrates a particular process in plants. Study the same and answer the quesUons that fotlow: ....,.... ,,n ,..._ (a) Name the apparatus. (b) What is the importance of the air bubble in the experiment? 9 (3) GIi ~ OJ SCMOOLS (C) Which phenomenon Is demonstrated by this apparatus? (i) Name the hoonone that inhi>it apical dominance in plants. (1) (If) Give reason: Only the male child suffers from colour blindness and noc the (2) QUNtlonl female. (Iii) Leaves ol a sensitive plant wilt and droop down on a slight aoucti. (2) What mechanism brings about this change? I. riv> The diagram given below shows a section ol the human ovary. ------- - ' ~~~" O O " ~J .,-"..- ~ 0 0 (2) , I \ n0 0 >1 2 (a) Name the process for the release of the part labelled 1. (b) Write the name of the structure marked 2. (v) Study the diagram given below and then answer the questions that follow. 10 (3)

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