MC 17 B - 3. (e) Choose the odd one out. Give a reason for your answer by stating the category.

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1 MC 7 B - SECTION I (0 Marks) Attempt all questions from this section. Question (a) Name the following: (i) The phase of the cell cycle in which DNA is synthesized. (ii) The part of the brain concerned with muscular co-ordination and balance. (iii) The cross that results in the phenotypic ratio :. (iv) Suspension which is injected into the body to provide immunity against a disease. (v) Two defects found on the X chromosome. Select a suitable word from the alternatives given to fill in the blanks in the following : (i) The foetus draws its oxygen from the [placenta, ammion, amniotic fluid, umbilical cord] (ii) The process by which autotrophs synthesise food [nutrition, respiration, photosynthesis, chemosynthesis] (iii) Living cells show plasmolysis when placed in a solution. [hypotonic, hypertonic, isotonic, water] (iv) The substance which produces an immune response and antibodies when introduced in the body is called [antitoxin, antigen, immunoglobulin] State one difference between the following pairs as directed. (i) Prostate and Cowper s gland (function) (ii) Myxoedema and exopthalmic goitre (cause) (iii) Seminiferous tubules and Leydig cells function) (iv) D.P.T. and B.C.G. (disease prevented) (v) Cushing s disease and Addison s disease (cause) (vi) Guttation and bleeding (location) State if the following are true or flase. Correct the statement if false, by changing the first or last word. (i) Deafness is caused due to rupturing of the pinna. (ii) The act of giving birth to a young one is called micturition. (iii) Hypermetropia can be corrected by a convex lens. (iv) Xerophytes have stomata which are closed. (v) The external female genitalia is called vagina. [] [6] (e) Choose the odd one out. Give a reason for your answer by stating the category. (i) Grana, stroma, chloroplast, mitochondria. (ii) Stomata, lacrimal glands, thyroid gland, pituitary gland. (iii) Pancreas, lacrimal glands, thyroid gland, pituitary gland. (iv) Spermicide, I.U.D., condom, testosterone. (v) Production of oxygen, production of ATP, production of glucose. MC 7 B -

2 (f) Observe the diagram given alongside and answer the questions given below : (i) Identify the defect. (ii) State reasons for this defect. (iii) Draw a diagram to show the diagram for the rectification of this defect. (g) (h) (i) Draw and label the structure of a chloroplast. Define : (i) Mortality (ii) Demography (iii) Transpiration Give scientific reasons for the following: (i) People living in hill stations suffer goitre. (ii) Systolic pressure is higher than diastolic pressure. (iii) People suffering from diabetes mellitus have sweet urine. (j) (i) Name the protective covering of the brain. (ii) State the difference between rods and cones with respect to the pigment. (iii) A pair of genes representing two alternative characteristics of the same character are called. Division of nucleus is called. SECTION II (0 Marks) Attempt any four questions from this section. Question (a) The diagram given below represents the pathway of the ciculatory system in man. Study the diagram carefully and answer the questions below. (i) Label 7 (ii) Name the chamber of the heart which receives blood from. (iii) Give two structural differences between blood vessels and 5. (vi) After a protein rich diet which blood vessel will contain. () highest urea content () maximum water (i) Explain the process of clotting of blood. (ii) Name the vitamin necessary for clotting of blood. What would happen if there was deficiency of this vitamin. MC 7 B -

3 By means of a labeled diagram show : a human sperm Question (a) (i) Label 8 (ii) What are and collectively called? (iii) Explain in brief the process taking place in and. (iv) State differences in the liquid in and [½] Observe the diagram given alongside and answer the questions given below: (i) Identify the type of cell division. (ii) Is this an animal cell or plant cell? Give a reason for your answer. (iii) Label to. (iv) Name the stage of cell division represented. (v) What will be the number of chromosomes in each daughter cell formed at the end of this cell division? (vi) Draw the next stage after the one shown in the diagram. Question (a) State Mendel s law of dominance. In dihybrid cross when two traits are considered, the number of possible combinations in the offsprings increase. Supposing that black hair (B) is dominant over blonde hair, Brown eyes (E) are dominant over blue eyes (e); state the percent of offsprings expected to have blonde hair and blue eyes if the father has black hair (heterozygous) and brown eyes (heterozygous) and the mother has blonde hair and blue eyes. Differentiate between: (i) genotype and phenotype (ii) autosome and sex chromosome [] MC 7 B - 5

4 Differentiate between. (i) antiseptic and disinfectant (ii) passive and active immunity (e) (i) Name the part of the brain that regulates heart beat and breathing. (ii) Blinking eyelids when exposed to bright sunlight - natural or acquired relex. Question 5 (a) 5 The diagram represents the path taken by an impluse. (i) What is this path taken and action taken called? (ii) Label 5 (iii) How is the arrangement of nerve cells in the above different from that of the brain? (iv) Name the term given to the point of contact between two nerve cells. With respect to the ear. (i) Name the structure that converts sound waves into vibration. (ii) The structure that converts vibrations into impulses. (iii) The structure that responds to a change in position (iv) Equalize pressure on either side of the eardrum. Name the hormones responsible for the following functions: (i) Develops secondary sexual characteristics in women. (ii) Enhances breakdown of glycogen to glucose. (iii) Controls formation of sperms and growth of Graafian follicle. (iv) Contractions during child birth. Differentiate between vasectomy and tubectomy, on the basis of whom it is perfomed and the organ ligated and tied. Question 6 (a) The diagram below represents the female reproductive system in mammals. 6 MC 7 B -

5 (i) Label (ii) What is the onset of reproductive phase in females called? (iii) Where do the following take place?. Fertilization. Implantation (iv) Name the hormones produced by. (v) Complete the following relationships. Man - Penis, Female.. Man - Scrotum, Female. (vi) Write a short note on the palcenta. Draw a neat labeled diagram to show that oxygen is given : (i) out during phtosyntheis (ii) give an equation for the reaction. The diagram given below explains of a factor necessary for a phenomenon is green plants. The apparatus is first placed in the dark for hours and then in the sun. (i) State the aim of this process. (ii) What is the function of KOH? (iii) Draw and label the leaf as it would appear after iodine was put on it to perform the starch test. KOH Question 7 (a) Study the diagram and answer the questions given below: (i) State the aim for the experiment. (ii) What is the function of anhy. CaCl? (iii) After a few hours how will the weight in A be different from B.Give a reason for your answer. (e) Study the diagram and answer the questions below. (i) Name the state of the cell. (ii) What is the name of the cell structure which is semipermeable? (iii) What feature would not have been observed had the cell been placed in water and not 0% sucrose solution? What is the government doing in order to check automobile pollution? State methods how the plant adapts itself to (i) photosynthesis (ii) transpiration State uses of antibiotics. MC 7 B - 7