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Set A MAHESH TUTORIALS I.C.S.E. GRADE - X (2015-2016) Exam No. : MT/ICSE/PRELIM -I-SET - A - 006 BIOLOGY SCIENCE Paper - 3 (One hour and a half) Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first l5 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 (40 Marks) Attempt all questions from this section. Question 1 (a) Name the following : [5] (i) The gland present in the eyes. (ii) The gland which is often called master gland. (iii) The cell division also known as reduction division. (iv) The endocrine gland present only in females. (v) Large polyhedral cells in the connective tissue of the testis which produce male sex hormone. (b) Given below is an example of a certain structure and the special functional activity with which it is concerned. [5] Example : Cochlea and hearing. On a similar pattern, fill in the blanks in the following pairs to represent relationships between the structure and their special functional activity. (i) Acting as a cushion for the embryo and ________. (ii) Vitamin A and synthesis of ________. (iii) Rods and _______ . (iv) Semicircular canal and _______ . (v) ______ and maintaining the shape of the eyeball. (c) Choose the odd one out and give the reason for your answer : [5] (i) Midbrain, cerebrum, motor impulses, pons. (ii) Hormones, low molecular weight, electrical signals, chemical messengers. T15 PIA 006 Copyright reserved. This Paper consists of 5 printed pages. Turn over ... 2 ... Set A (iii) Night blindness, vitamin A deficiency, rhodopsin, astigmatism. (iv) Dwarfism, gigantism, diabetes insipidus, diabetes mellitus. (v) Capicitation, sperm, corpus luteum, flagella. (d) State whether the following statements are true or false. If false,rewrite the correct statement by changing the first anil the last word only. [5] (i) Graffian follicle ruptures and an ovum is released on day - 10. (ii) Transpiration is a physiological process of loss of water. (iii) Malfunctioning of thyroid results in gigantism. (iv) Insulin is a hormone produced by pancreas. (v) Starch can be tested by alcohol. (e) (i) (ii) (iii) (iv) (v) Give the exact location and function of the following : Pericycle Synapse Membranous labyrinth. Adrenal gland. Neuron [5] (f) Given below in the box are a set of 14 biological terms. Of these 12 can be paired into 6 matching pair of the six pairs, one has been done for you as an example. Write out the remaining 5 matching pair made by you as '1' to '5'. [5] Thyroid, midbrain, retina, lachrymal fluid, motor activities, goitre, lubricant, image, umbilical cord, natality, cluster of blood vessels, birth-rate, pheromones, chemical signals. Example : Midbrain motor activities. (g) See the figure given below and answer the following. [5] (i) Label the parts marked 1 - 5. (ii) What is the function of '5' ? T15 PIA 006 Turn over ... 3 ... Set A (h) Given below are six sets of terms. In each case, arrange and re-write each set of terms so as to get a logical sequence : [5] (i) Capturing of sunlight by chlorophyll, grana of chloroplast, sunlight, photosynthesis, evolution of oxygen leaf. (ii) Fenestra ovalis, organ of corti, ear ossicle, tympanic membrane. (iii) Diplotene, Diakinesis, Pachytene, Leptotene, Zygotene. (iv) Effector, motor neuron, sensory neuron, receptor, stimulus. (v) Photosynthesis, stomata open, daytime, higher carbohydrate, swollen guard cells, osmotic uptake of water. SECTION II (40 Marks) Attempt any four questions from this section. Question 2 (a) See the diagram of an experiment. Identify the experiment and describe it. [5] Question 3 (a) Following diagram shows the picture of an endocrine gland. Study the diagram and answer the f'ollowing questions. [5] (i) Identify the structure. (ii) Label the parts marked 1-3. (iii) Name the hormone / hormones released by this gland. (iv) Write the location of gland. T15 PIA 006 Turn over Set A ... 4 ... Question 4. (a) The following simple experimental set up is shown to demonstrate certain phenomenon in plants, carefully and answer the questions which follow. (i) (ii) (iii) (iv) (v) What is the phenomenon being demonstrated here? Give the procedure of setting up the experiment. What is the observation ? What is the conclusion? How the control experiment is set up? Water drops [5] Bell jar Polythene bag (b) Give the difference between the following pairs : (i) Sensory neuron and motor neuron. (ii) Polygenic trail and intermediate expression (iii) Bivalent and chiasmata. (iv) Telocentric and metacentric. (v) Dendrite and axon [5] Question 5 With the help of suitable labelling, draw different stages of Mitosis. [5] Question 6 The figure alongside represents an experiment performed to demonstrate certain phenomenon in plants. The set-up was kept in sunlight for about two hours. (i) What is the aim of this experiment? (ii) Define the process mentioned in (i). (iii) What do you obsere in the experiment as an evidence of the process stilted in (i) and (ii). (iv) What precautions would you take for proper results in the experiment? (v) Suggest a suitable control experiment for comparison. T15 PIA 006 [5] Turn over Set A ... 5 ... Question 7 Give biological reasons for the following. [10] (a) Meiosis I is called reduction division. (b) The energy in a lion is said to be acquired from sun. (c) Older people tend to feel more cold. (d) Why the Government has made it mandatory for all the salt manufacturers to supply iodised sail? (e) The amnion sac in the uterus of the female during pregnancy is filled with a fluid. All the Best T15 PIA 006 Turn over Set A MAHESH TUTORIALS I.C.S.E. ICSE X SUBJECT : BIOLOGY Exam No. : MT/ICSE/PRELIM -I -SET A 006 Marks : 80 Time : 1 hrs. Model Answer Paper SECTION I (40 Marks) Attempt all questions from this section. A.1 (a) (i) (ii) (iii) (iv) (v) Lacrimal gland Pituitary gland. Meiosis Ovary. Leydig cells. 1 1 1 1 1 (b) (i) (ii) (iii) (iv) (v) Acting as a cushion for the embryo and Amnion. Vitamin A and synthesis of Pigment Rhodopsin. Rods and Help to see in dim light. Semicircular canal and Maintaining body balance. Vitreous humour and maintaining the shape of the eyeball. 1 1 1 1 1 (c) (i) Cerebrum : It is the seat of mental abilities like thinking, memory, reasoning, perception etc. where midbrain relays motor impulses from the cerebral cortex to the pons and spinal cord. Electrical signals : Hormones are chemical messanger which have low molecular weight, while electrical signals are related with the nervous control. Astigmatism : Because it is caused due to uneven curvature of the cornea whereas vitamin A deficiency causes Night blindness because rhodopsin which helps to see in dim light is synthesised from vitamin A Diabetes insipidus : This is caused due to the deficiency of pancreatic hormone, insulin. Rest are caused by ihe different pituitary hormone deficiency. Corpus lutcum : It is a structure in female gonad - the ovary whereas motile sperm moves by beating flagellae to enter the ovum where changes occur in the sperm that enables it to fertilize the ovum the process known as capacitation. (ii) (iii) (iv) (v) (d) (i) (ii) (iii) (iv) (v) False. Corrected statement : Graffian follicle ruptures and an ovum is released on the 13 th or 14th day. True. False. Corrected statement : Malfunction of thyroid results in cretinism. True. False. Corrected statement : Starch can be tested by iodine. T15 PIA 006 1 1 1 1 1 1 1 1 1 1 Turn over Set A ... 2 ... (e) (i) (ii) (iii) (iv) (v) Location Location Location Location Location (f) 1. 2. 3. 4. 5. Thyroid goitre Retina image Lacrimal fluid lubricant Umbilical cord cluster of blood vessels Natality birth rate 1 1 1 1 1 (g) (i) 1. 2. 3. 4. 5. 1 1 1 1 1 : : : : : 1 1 1 1 1 Beneath the endodermis. At the junction between two neurons. Present in the inner most part of the ear. At the top of each kidney. Present in the brain and spinal cord. Sensory neuron White matter Grey matter Spinal cord Motor neuron (ii) Motor neurons carry messages / instructions from the brain and the spinal cord through efferent fibres to various organs. 1 (h) (i) (ii) (iii) (iv) (v) Sunlight, leaf, grana of chloroplast. capturing of sunlight by chlorophyll, photosynthesis, evolution of oxygen. Tympanic membrane, ear ossicles, fenestra ovalis, organ of corti. Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis. Stimulus, receptor, sensory neuron, motor neuron, effector. Day time, photosynthesis, higher carbohydrate concentration, osmotic, uptake of water, turgid guard cells, stomata open. 1 1 1 1 1 SECTION II (40 Marks) Attempt any four questions from this section. A.2 This is Pavlov's experiment. In 1920 Ivan Pavlov gave a classic example of conditioned reflex to sound. He observed that the sight and smell of food caused salivation in a hungry dog. He rang a bell first. The dog showed no response. But when he placed food near the dog it started salivating. Next, he simultaneously sounded a bell and placed food in front of the dog, the dog salivated. By repeating this process a number of times, a time came when the dog started salivating to the mere sounding of the bell (food was not provided) as the dog learnt to correlate the bell with food. So the bell substituted for the site of food as a stimulus to induce salivation. Here the sound of bell was the stimulus and salivation was the conditioned response. 5 T15 PIA 006 Turn over ... 3 ... Set A A.3 (i) Thyroid gland. (ii) 1. Larynx 2. Thyroid gland 3. Trachea (iii) It secretes two hormones thyroxine and calcitonin. (iv) The gland is located infront of the neck, below the larynx. A.4 (a) (i) (ii) (iii) (iv) (v) (b) (i) (ii) (iii) (iv) (v) 5 The experimental set up is to demonstrate the phenomenon of transpiration. Take a well watered potted plant. Cover the pot with polythene bag and tie the mouth of the bag to prevent water vapours from escaping from the bag. Drops of water appear on the inner surface of the polythene bag. It is proved by the above experiment that water drops are the condensed water vapours produced transpiration. For control, set up a similar experiment without the plant. It is observed after some time that there are no water drops seen in the control set-up. Sensory neuron : Transmit impulses from receptors to brain. Motor neuron : Carry messages or instructions from the brain and spinal cord. Polygenic trait : Some traits are determined by the combined effect of more than one pair of genes. Intermediate expression : Apparent blending can occur in the phenotype when there is incomplete dominance resulting in intermediate expression of a trait in heterozygous individuals. Bivalent : It refers to a pair of chromosomes when they pair up during meiosis. Chiasmata : It refers to that area where crossing over has taken place during prophase of meiosis. Telocentric : It is a rod shaped chromosome having centromere at the proximal end. Metacentric : Chromosome having the centromere at the centre and forming two equal arms. Dendrite : Most neurons give off a number of short branching processes called dendrites. Axon : One of the processes arising from neuron is very long having only neurofibrils is called the axon. T15 PIA 006 1 1 1 1 1 1 1 1 1 1 Turn over Set A ... 4 ... A.5 [5] A.6 (i) Aim of this experimental set up is to demonstrate transpiration in plants. (ii) Transpiration is a physiological process of loss of water in the form of water vapour from the internal tissues of plants, through the aerial parts of the plants. (iii) Water vapour condensed on the inner wall of the bell jar is an evidence of transpiration. (iv) (a) A well-watered potted plant where the pot is wrapped with a polythene sheet and firmly tied uroum the stem. (b) The base of the bell jar is sealed with vaseline. (v) A control experiment is a similar set-up but without a plant. [5] A.7 (a) In the first meiotic division, the reduction in chromosome number takes place. Here, the number of chromosomes is reduced to half. Thus, it is called reduction division. (b) Green plants produce food by the process of photosynthesis by utilising sun s energy. These plants are eaten up by herbivores which are in turn eaten up by carnivores like lion. Thus the energy in the lion is said to be indirectly coming from the sun as photosynthesis is the only process by which food can be produced. (c) The thyroid gland regulates the body metabolism, by causing an increase in basal metabolic rate which raise the body temperature. With advancing age, the activity of thyroid glands slows down and body heat productin is lowered. That is why older people tend to feel more cold than youngsters. (d) Under-activity of the thyroid results in a swelling called 'Goitre' in the throat. It is more common in the hilly regions of India as the soil there is deficient in Iodine. Thus, Iodised salt is the best remedy for iodine deficiency. That is the reason why the Government has made it mandatory for the salt manufacturers to supply iodised salt. (e) The amnion, a sac filled with amnion fluid, develops round the embryo during gestation period. The fluid acts as a cushion for the embryo and protects it from machenical jerks, and also prevents sticking of the foetus to the amnion. [10] T15 PIA 006 Turn over
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