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GRADE: 10 DATE: 23.02.17 MOCK EXAMINATION FEBRUARY 2017 BIOLOGY TIME: 2 HOURS MAX.MARKS: 80 _____________________________________________________________________________________________ Answers 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 on 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 the questions are given in brackets [ ]. SECTION I (40 MARKS) Attempt all questions form this section Question 1. a. Name the following: [5] (i) The statistical study of human population (ii) Pair of genes responsible for a particular characteristic in an individual. (iii) A solution whose concentration is greater than that of the cell sap (iv) The part of the chloroplast where the light reaction of photosynthesis takes place. (v) An artery that carries deoxygenated blood. b. Given below are sets of 5 terms each. Without changing the first term, rearrange the remaining four, so as to be in logical sequence. (i) Pathogen, active immunity, produces antibodies, lymphocytes, antigen. (ii) Ovulation, implantation, parturition, gestation, fertilization (iii) Karyokinesis, S-phase, cytokinesis, G1- phase, G2-phase. (iv) Seminiferous tubule, penis, urethra, epididymus, vas deferens (v) Nucleus, DNA, chromosome, nucleosome, nucleotide Page 1 of 6 [5] c. Differentiate between the following pairs pertaining to the character mentioned within the bracket: [5] (i) (ii) (iii) (iv) (v) Natality and mortality Acromegaly and cretinism FSH and LH Antibody and antibiotic Serum and vaccine (definition) (symptoms) (function) (source) (composition) d. Give reason for each of the following statements: [5] (i) Auricle wall is less muscular than ventricular wall. (ii) Transpiration is called necessary evil. (iii) Blood flowing away from the stomach and intestine is put into circulation via the liver and not directly. (iv) First phase of menstrual cycle is referred as growth phase. (v) Some adult women may develop facial hair. e. Briefly explain the following : (i) Prophylaxis (ii) Vasectomy (iii) Stereoscopic vision (iv) Ozone layer depletion (v) Active transport [5] f. The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow. [5] (i) Name the phase. (ii) Which part of the heart is contracting in this phase? Give a reason to support your answer. (iii) Name the parts numbered 1 to 6. (iv) What type of blood flows through the parts marked 1 and 2 ? (v) How many valves are closed in this phase? Name them. g. Mention the location and one main function of each of the following: (i) Corpus luteum (ii) Seminal vesicles (iii) Hydathodes (iv) Cerebrospinal fluid (v) Acrosome. Page 2 of 6 [5] h. State whether the following statements are true or false. If false, rewrite the correct statement. (i) (ii) (iii) (iv) (v) [5] Hypermetropia is a defect of the eye caused due to eye ball being elongated. Pleural membrane is the membrane covering of heart. Amniotic fluid serves to provide oxygen to foetus. A rise in blood pressure below 140/90 is known as hypertension. The dark reaction of photosynthesis is light dependent. SECTION II (40 marks) Answer any four questions from this section: Question 2 a) Give scientific reasons for the following : [5] (i) Leaves of certain plants roll up on bright sunny day. (ii) Blood in the arteries flows in spurts. (iii) Glucose is normally not found in urine. (iv) Marine fish burst when thrown under tap water. (v) Gametes have haploid number of chromosomes. b) Given below is the diagram of a part of the human ear: [5] i) Give the biological term for Malleus, Incus ii) and Stapes State the functions of the parts labelled iii) A and C . Name the part labelled D and its function. iv) Give the function of organ of corti v) Why is the ear gets blocked when there is cold? Question 3 a) Draw a neat labeled diagram of (i) Metaphase stage of a plant cell undergoing mitosis (ii) Chloroplast Page 3 of 6 [5] b) Observe the diagram given below and answer the following questions: [5] (i) Name the process being studied. (ii) Explain the process. (iii) What change would you observe in the thistle funnel containing sugar solution after about 10 minutes? (iv) Is the sugar solution hypertonic or hypotonic? Give reason. (v) Name the part of the plant cell which is represented by the sugar solution. Question 4 a) Given below is an outline of the human body showing the important glands? [5] (i) Name the glands marked K to P. (ii) Name the hormone secreted by L. Give one important function of this hormone. (iii) Name the endocrine cells present in part M. List the hormones secreted by this region. (iv) Why is gland K referred as master gland? b) Given below is an example of a given structure and its functional activity. Example: kidney and excretion. (i) Ribosomes and (ii) Meninges and (iii) Neutrophils and (iv) Cochlea and . (v) Methane and Page 4 of 6 [5] Question 5 a. Draw a neat labeled diagram of the human urinary system. b. Observe the experimental set up shown beside and answer the following questions. [5] [5] (i) Name the process being studied in the given experiment. (ii) Explain the process mentioned above. (iii) Why is oil placed over the water? (iv) What do we observe with regard to the level of the water when this set up is placed in (1) bright sunlight (2) humid condition (3) windy day. (v) Mention two adaptation found in plants to overcome the process mentioned (ii) above. Question 6 a) Answer the following questions: [5] (i) Explain the cause of ozone layer depletion and its effects on life. (ii) How are fraternal twins different from identical twins? (iii) How is presbyopia different from astigmatism? (iv) What is Red cross ? Mention any two major activities of them. (v) Environmental pollution is a recent problem .Do you agree? State two steps to reduce vehicular pollution. b) Study the diagram and answer the following questions. (i) Label parts marked as A to D. Page 5 of 6 [5] (ii) What is the state of the cell at the end? Name the structure that behaves as the selectively permeable membrane. (iii) If the cell was placed in distilled water instead of strong sugar solution, which feature would not have been present? (iv) If the cell in the given diagram possessed chloroplasts where would these be present? (v) Mention any one feature of this plant cell that is not present in the animal cell. Question 7 a. A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait color-blindness. Study the chart and answer the following questions. [5] (i) Who is color- blind in the parents- father or mother? (ii) How many daughters and sons have been born in the family? (iii) What does child 1 indicate about this trait? (iv) On which chromosome is the gene of this trait located? Name another trait in human which follows the similar pattern of inheritance. (v) State Mendel s Law of Independent Assortment . b) (i) (ii) (iii) (iv) (v) Briefly explain the following terms and mention significance of each: Menarche Acid rain Angina pectoris Vehicular standards Portal system Page 6 of 6 [5]
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