MC 17 B - 8 SECTION I

Transcription

1 SECTION I (40 Marks) Attempt all questions from this section. Question 1 (a) Name the following : (i) The gland which secretes oxytocin The part of brain which is concerned with memory. (iii) The functional and structural units of the kidney. (iv) The canal through which testes descend into scrotum just before birth in a human male child. (v) The point at which one neuron ends and the other starts. (c) (d) (e) The first pair in the following lists indicates the kind of relationship that exists between both the items. ewrite and complete the second pair on a similar basis. Example : Ear : Hearing : : Eye : Sight (i) Emergency hormone : Adrenaline : : Birth hormone : Cochlea : Hearing : : Semicircular canals : (iii) Mitosis : two cells : : Meiosis : (iv) Cranial nerves : 12 pairs : : Spinal nerves : (v) Hormonal pills : Prevent ovulation : : Condom : Mention where in living organisms are the following specifically located and state their main function :- (i) Eustachian tube Suspensory ligament (iii) Thyroid gland (iv) Epididymis (v) Palisade cells State whether the following statements are True or False. If false, rewrite the correct form of the statements by changing the last word only: (i) Deafness is caused due to rupturing of pinna. Fertilisation takes place in the uterus. (iii) Veins have broader lumen. (iv) Guttation is seen in plants due to excessive root pressure. (v) Spermatogenesis takes place in gonads of females. Complete the following statements by choosing appropriate terms from the options provided (i) The structure that controls pituitary gland is called. (a) Thalamus Hypothalamus (c) Diencephalon (d) Pons is an artery carrying deoxygenated blood. (a) Pulmonary artery Carotid artery (c) enal artery (d) Aorta (iii) The purines are. (a) Adenine and Thymine Guanine and Cytosine (c) Adenine and Cytosine (d) Adenine and Guanine 152

2 X - ICSE (Biology) (iv) oot hair is a. (a) Cilium Cell (c) Extension of a cell (d) Group of cells (v) The physical expression of genetic character is called. (a) Character Genotype (c) Phenotype (d) Trait (f) (g) (h) Given below is a table consisting of a set of items belonging to a common category. Complete the table by filling in the category of the others and the odd in the blanks : Set Category of the others Odd one (i) Pleura, Pericardium Meninges, Spinal Cord Phenol, Boric acid, Iodine Mercurochrome (iii) Ultrafiltration, eabsorption, Diffusion, Tubular secretion (iv) Coughing, Sneezing, Eating Blinking (v) BCG, abies, Cholera, Tuberculosis State one difference in each of the following with respect to the aspect stated within brackets : (i) Plasma and Lymph (composition) Lenticels and Stomata (location) (iii) Glucocorticoids and Mineralocorticoids (function) (iv) Myopia and Hypermetropia (Position of image) (v) Tubectomy and Vasectomy (Definition) Given below are five sets of five terms each. In each case, rewrite the terms in logical sequence as directed at the end of each statement. One has been done for you as an example. Example : Vagina, Ovary, Uterus, Oviduct, Cervix, (pathway of egg after fertilization) Answer : Ovary Oviduct Uterus Cervix Vagina (i) S phase, Karyokinesis, G1 phase, Cytokinesis, G2 phase (sequence of events in cell cycle) Pericycle, Endodermis, oot hair, Xylem, Cortex (Movement of water from soil to root interior) (iii) Vas deferens, epididymis, seminiferous tubules, urethra, ejaculatory duct (path of Sperm movement to exterior) (iv) Destarched plant, iodine added, washed in water, a leaf boiled in alocohol, placed in sunlight (testing for presence of starch) (v) Clot, Thrombin, Fibrinogen, Prothrombhin, Fibrin (Blood Clotting) 153

3 X - ICSE (Biology) SECTION II (40 Marks) Attempt any four questions from this section. Question 2 (a) Following figure shows a human foetus in the uterus: (i) Label the parts 1 to 4 State the function of the part marked 1, 3 (iii) Name a hormone produced by part (i) Draw a labelled diagram of the internal structure of a chloroplast. [3] Define the following terms:- [2] (1) Stimulus (2) Active Transport Question 3 (a) Given below is a diagram representing a stage during mitotic cell division in an animal cell. 3 4 (i) Identify the above stage Name the cell organelle that forms the aster. (iii) Name the parts labelled 1, 2 and 3 (iv) Name the stage that follows this stage of mitosis. (v) State two differences between Mitosis and Meiosis with regard to :- (1) Chromosome number in daughter cells (2) Type of cells in which it occurs. 154 The diagram below shows an apparatus used to study a particular phenomenon in plants. (i) Name the apparatus. What is it used for? (iii) What is the role played by the air bubble eservoir in this experiment? Stop cock Air Bubble (iv) What is the use of reservoir? (v) What happens to the movement of the air Water bubble if the apparatus is kept in the Coloured water dark? Give a reason for your answer.

4 X - ICSE (Biology) Question 4 (a) Given below is the simplified pathway of the circulatory system of man. (i) Name the blood vessels marked 1, 4, 7, 8 Name the chamber of the heart which : (1) receives blood from 1 (2) pumps blood into blood vessel 8 (iii) Mention two structural differences between blood vessels 7 and 2 (i) State any 3 functions of WHO. [3] State the full form of DTP, IUD. [2] Question 5 (a) (i) A genetic disease is caused by a recessive allele (r), the normal condition () is dominant. The mother is a carrier for the disease while father has normal alleles. mother r father (1) Complete the given diagram to show genotype of possible children. (2) Will any of their children suffer from this genetic disease. Give reasons to support your answer. Explain the following terms: (1) Adrenal virilism (2) Alleles Given below is a simple diagram of the human kidney cut open longitudinally. Answer the following questions :- Cortex Papilla Medulla Pelvis enal artery enal vein Pyramids Ureter 155

5 X - ICSE (Biology) (i) Give the definition of excretion. Why is right kidney lower in position as compared to left kidney? (iii) Why does the cotrex of the kidney show a dotted appearance? (iv) Write two differences in the composition of the blood flowing through blood vessels A and B. Question 6 (a) Complete the following table by filling in the blanks numbered 1-10 Gland Hormone Function Disease Pituitary (1) Body growth (2) (3) Water reabsorption by kidney (4) (5) (6) Glucose to glycogen (7) Adrenal (8) (9) Addison s Disease Thyroid Thyroxine (10) Goitre Explain the following statements giving scientific reasons :- (i) ATP is considered as energy currency of the cell. The hand automatically shows the direction to turn by a cyclist without thinking (iii) Most often only one embryo is formed at a time, although there are two ovaries in women. (iv) There has been a rise in population in recent years. (v) During the day transpiration and photosynthesis are interlinked. Question 7 (a) In the figure below A shows a cell in the normal state and B shows the same cell after leaving it in a certain solution for a few minutes. (i) Describe the change which has occured in the cell as seen in B. Give the technical terms for the condition of cell as seen in B (iii) Define the process which led to this condition. (iv) What was the solution in which the cell was kept? Give one term for the following statements :- (i) Treatement of diseases by use of chemical substances. Number of individuals per square kilometer at any given time. (iii) Substances that increase the formation of urine. (iv) The type of blood circulation in the human body. (v) Conversion of Adenosine Diphosphate to Adenosine Triphosphate by adiition of an inorganic phosphate. 156