Formatting page ...
SHARADA MANDIR SCHOOL PRELIMINARY EXAM JAN 2024 STD: 10 BIOLOGY MARKS: 80 TIME: 2 HRS INSTRUCTIONS: Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the 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 the answers. Attempt all questions from Section I and any FOUR questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION I ( Attempt all questions from this Section ) Question 1 Select the correct answers to the questions from the given options. (Do not copy the question, write the correct answers only.) [15] (i) A substance that diffuses out of the foetus into the placenta is : (a) Glucose (b) Urea (c) Fats (d) Oxygen (ii) The most primitive ancestor of man is: (a) Homo habilis (b) Neanderthal (c) Homo sapiens (d) Cro-magnon (iii) Shaaz, took some raisins and soaked them in water. After a few hours he saw that the seeds had swollen. According to you which phenomenon is responsible for the change in the size of the seeds? (a) Imbibition (b) Transpiration (c) Guttation (d) Capillarity (iv) An experiment with a black paper and iodine solution was demonstrated to show the role of sunlight during photosynthesis. Which of the statements is/are involved in the above process? 1. The black paper absorbs carbon dioxide, inhibiting photosynthesis. 2. The black paper releases Oxygen, stimulating photosynthesis. 3. The black paper blocks sunlight, inhibiting photosynthesis. 4. The black paper reduces water uptake, inhibiting photosynthesis. (a) Only 3 (b) Only 1 and 2 (c) Only 3 and 4 (d) Only 1 and 3 (v) Industrial melanism refers to : (a) Evolution of plants in polluted environments. (b) Evolution of insects in industrial areas. (c) Changes in human skin colour due to pollution. (d) Changes in peppered moth population due to industrial pollution. (vi) Which of the following is not a function performed by the circulatory system? (a) Development of immune system. (b) Removal of nitrogenous metabolic waste products from the body. (c) Transport of hormones. (d) Distribution of heat by keeping the temperature of the body uniform. (vii) Assertion (A): Marley has been experiencing increased thirst and urination is frequent and copious. Reason (R): Deficiency of ADH in the above symptoms are causing Diabetes insipidus. (a) Both A and R are false. (b) A is true and R explains A. (c) A is true and R does not explain A. (d) A is false and R is true. CONT D..... 1 PAGE 2 BIOLOGY STD 10 (viii) The term natality represents : (a) The number of deaths per 1000 of population per year. (b) Number of individuals leaving the population. (c) Number of individuals added per 1000. (d) The number of live births per 1000 people of population per year. (ix) What is the name of the region where the optic nerve originates and there are no sensory cells? (a) Fovea centralis (b) Macula lutea (c) Blind spot (d) Sacculus (x) In a population of birds, feather colour varies from green to blue. The blue colour is determined by a dominant allele (B) and the green colour is determined by a recessive allele (b). Two green- feathered birds are mated. What is the probability of getting blue- feathered offsprings? (a) 25% (b) 0% (c) 100% (d) 50% (xi) With respect to Mitosis which of the following statements is true? 1. During Mitosis, the chromosome number is reduced to half in the daughter cells. 2. Mitosis leads to gamete formation. 3. Mitosis involves only one nuclear division. 4. Two daughter cells that are formed are exactly similar with the same number of chromosomes. (a) 1 is true. (b) 3 is false and 4 is true. (c) Both 3 and 4 are true. (d) 1 and 4 are true. (xii) A botanist noticed that a desert plant had thick waxy leaves with sunken stomata .What is the likely reason for these adaptations? (a) To reduce transpiration and conserve water. (b) To maximise water absorption from the soil. (c) To increase transpiration and conserve water. (d) To enhance photosynthesis in dim light conditions. (xiii) Bhawya was playing on the ground and a dust particle entered her eye. She stopped and asked her friend to check her eye. There was a sudden flushing of tears in her eye, this could be due to: (a) Endosmosis (b) Dehydration (c) Reflex action (d) Voluntary action (xiv) The expanded form of DDT is (a) Dichloro-dualphenyl- trichloroethane. (b) Dichloro-diphenyl-trichloroethane. (c) Dualchloro-diphenyl-trichloroethylene. (d) Dichloro-diphenyl-tetrachloroethane. (xv) Which of the following is non-biodegradable? (a) Fruit peels (b) Bark of trees (c) Fly ash (d) Cowdung CONT D..... 2 PAGE 3 BIOLOGY STD 10 Question 2 (i) Name the following : [5] (a) The layer of the eyeball that forms the transparent cornea. (b) The number of chromosomes present in a nerve cell of a human being. (c) The X shaped structure formed due to crossing over between the non-sister chromatids of the paired homologous chromosomes. (d) A condition where an abnormal increase in the RBC is seen. (e) The insulating sheath covering the axon. (ii) Arrange and rewrite the terms in each group in the correct order so as to be in a logical sequence beginning with the term that is underlined. [5] (a) Fibrinogen, Prothrombin, Thrombin, Fibrin, Thrombokinase. (b) Spongy cells, Stoma, Palisade tissue, Upper Epidermis, Substomatal space. (c) DNA, Nucleosomes, Chromatin fibre, Cell, Chromosome. (d) Pulmonary vein, Right auricle, Pulmonary artery, Lungs, Left ventricle. (e) Hydrogen ions, Molecular oxygen, ATP, NADPH, NADP. (iii) Choose the odd term from the following set of terms and name the category to which the others belong: [5] (a) Vagina, Vulva, Seminal vesicle, Uterus. (b) TSH, Insulin, GH, ADH. (c) Centrosome, Cell wall, large vacuole, Cell membrane. (d) Thymine, Adenine, Guanine, Pepsin. (e) Malleus, Utriculus, Sacculus, Cochlea. (iv) Match the items given in Column I with the most appropriate ones in Column II and rewrite the matching pairs. [5] Column I Column II (a) Adrenal Virilism 1. High level of Oestrogen. (b) Follicular phase 2. Production of antibodies. (c) RBC 3. Hypersecretion of adrenal cortex. (d) Cro-magnon 4. Oxygen carriers. (e) Liver 5. Orthognathous 6. Hyposecretion of adrenal cortex. 7. Detoxifies ammonia by converting to Urea. (v) State whether the following statements are true or false. If false, rewrite the false statements by changing the underlined word/words only. [5] (a) Meiosis leads to recombination of characters. (b) During exosmosis, the solvent molecules move from outside the cell to the inside. (c) A chemical normally used to test the rate of transpiration on either side of a leaf is Cobalt Chloride. (d) The yellow spot is the point at retina where more cone cells are concentrated. (e) A solid spherical mass of cells, resulting from repeated division of zygote is called as blastocyst. SECTION II ( Attempt any four questions from this Section ) Question 3 (i) Define genome. (ii) Mention two features of Neanderthal man. (iii) State the location of the following structures: (a) Sphincter (circular muscle) of the kidney. (b) Lenticels (iv) Write a short note on vasectomy. [1] [2] [2] [2] CONT D..... 3 PAGE 4 BIOLOGY (v) The diagram below represents a certain defect of the human eye. STD 10 [3] (a) Give the technical term for the defect shown in the above diagram. (b) Mention two causes for the defect. (c) How is the defect corrected? Question 4 (i) Define Diapedesis. [1] (ii) What is Swachh Bharat Abhiyan? Explain. [2] (iii) Differentiate on the basis of what is indicated in brackets: Prostate gland and Cowper s gland (function) [2] (iv) Write in brief about the cause and mention any two symptoms of exophthalmic goitre. [2] (v) A thin strip of epidermal cells from the fleshy scales of an onion bulb was examined in a drop of water, under a microscope. All the epidermal cells looked alike and the figure below represents one of them. The thin strip was then transferred to a drop of strong sugar solution and re-examined under the microscope after about ten minutes. [3] (a) Give the scientific term for the change shown in the above diagram. (b) Draw a neat diagram of one of the epidermal cells, as it might appear after immersion in strong sugar solution. Label any one part which has undergone a change. (c) What would you do to bring this cell back to its original condition? Question 5 (i) What is myocardial infarction ? [1] (ii) How are triplets formed? [2] (iii) What is the phenotype of the F1 generation if a homozygous tall plant is crossed with a homozygous dwarf plant. Draw a punnett square to show the gametes and offspring when both parents are heterozygous for tallness. [2] (iv) How is Haematuria different from Glycosuria? (definition) [2] (v) Given below is a representation of a type of pollution. Study the picture and answer the questions. [3] (a) Identify the type of pollution depicted in the above picture. (b) Name two sources of this pollution. (c) Give two ways how this pollution affects human health. CONT D..... 4 PAGE 5 BIOLOGY STD 10 Question 6 (i) Write a balanced chemical equation to represent the process of photosynthesis. (ii) ABA is known as a stress hormone. Give two reasons. (iii) Name the parts of the Diencephalon and state one function of each of them. (iv) Given below is a certain type of a blood vessel. Study the same and answer the questions that follow: [1] [2] [2] [2] (a) Identify the blood vessel shown. (b) Give two characteristic features of this blood vessel. (v) Draw a neat labelled diagram showing the structure of a human sperm cell and label any 4 parts.[3] Question 7 (i) What is Acromegaly ? [1] (ii) Potato cubes when placed in water become firm and increase in size. Give reasons. [2] (iii) Mention any two internal factors affecting photosynthesis and state their effect. [2] (iv) Differentiate between thigmotropism and hydrotropism (with respect to definition) [2] (v) The diagram given below is that of a structure present in a human kidney. Study the same and answer the questions that follow: [3] (a) What is the liquid entering part 1 called? (b) Give the composition of the liquid entering part 2. (c) What is diuresis? How is it caused? Question 8 (i) Define Synapse. [1] (ii) Explain two factors responsible for population explosion in India. [2] (iii) What is cataract? How can this defect be corrected? [2] (iv) Differentiate between Sickle cell Anaemia and Haemophilia (with respect to definition) [2] (v) Name and draw a neat labelled diagram of the stage that occurs after Metaphase in an animal cell having chromosome number 4. [3] ********** END *********** 5
|
