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Biology Preparatory Exam

6 pages, 78 questions, 45 questions with responses, 46 total responses,

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Sri Kumaran Public School (Affiliated to CISCE, New Delhi) Mallasandra II Preparatory Examination-January 2013 Subject: Science III (Biology) Date: 02/02/2013 Class: X Time: 1 Hr Marks: 80 This paper contains two Sections I and II Questions in Section I are all compulsory. Section II has six main questions. Answer any four of those questions. Marks for each question are indicated within the brackets ( ). Section I (40 Marks) Attempt all the questions from this Section Question 1 a. Name the following. i. Condition of the cell with one set of all kinds of chromosomes. ii. Tendency of all genes on a chromosome to pass on together from parent to offspring. iii. Intermingling of gas molecules. iv. Protective membranes of the brain. v. Membranous structure at the junction of outer and middle ear. (5) b. State whether each of the following statements are True or False. If, False rewrite the statement by changing the underlined word. (5) i. Nerves which arise from brain are called spinal nerves. ii. The fluid which maintains the shape of the eye ball is vitreous humor. iii. Surgical method of contraception in males is tubectomy. iv. Hyposecretion of thyroxin caused cretinism in adults. v. The pressure exerted by blood on the walls of arteries called pulse. c. Given below are five sets of terms in column 1. Of these three belong to a category and hence one of them is an odd term. Write the odd one out and mention the category of the other terms. (5) Sets of terms Category Odd term i. CO2 concentration, light, temperature, leaf size. ii.Photolysis, photophosphorylation, formation of glucose, activation of chlorophyll. 3. Hypothalamus, pons, medulla, cerebellum. 4. Seminiferous tubules, oviduct, sperm duct, epididymis. 5. Prophase, Anaphase, G1 phase, Telophase. d. Supply the fourth term to complete the series. (5) i. Autosomes: 22pairs :: Allosomes:__________________. ii. Stomata : Transpiration :: Hydathodes : _____________. iii. Rods : Rhodopsin :: Cones : _______________. iv. Abnormal increase in WBC count: Leukemia ::Decrease in WBC count below normal :__________. v. Testosterone: Interstitial cells :: Oestrogen : ___________. e. Given below in the box are the hormones produced in the human body. Match the hormone with its function. (5) Adrenaline, LH, FSH, GH, ADH, Oxytocin, Thyroxin, Androgen. i. Stimulates egg formation. ________________________. ii. Emergency Hormone. ______________________. iii. Growth of skeleton. ________________________. iv. Increases reabsorption of water. ________________. v. Uterine contractions. ___________________. f. Give the exact location of the following. i. Seminal vessicle. ii. Ceruminous gland. iv. Ureter. v. Adrenal gland. (5) iii. Tricuspid valve. g. Given below is a set of terms representing a process or a function. Arrange the terms in a logical sequence. (5) i. Ovulatory phase, menstrual phase, luteal phase, proliferative phase. ii. Pinna, organ of corti, ear ossicles, auditory nerve, cochlea. iii. Gestation, implantation, fertilization, ovulation, parturition. iv. Washed in water, iodine added, life boiled in alcohol, destarched plant, placed in sunlight. v. Tissue fluid, oxygen, lungs, blood, tissue. h. Given below is the diagram of front view of human heart. Label parts 1 to 5. (5) Section II (40 Marks) (Attempt any FOUR Questions from this Section) Question 2 a. Differentiate between each of the following. i. Anaphase I and Anaphase II. (Structure moving towards opposite poles). ii. Monohybrid and Dihybrid cross. (Definition). iii. Root pressure and Osmotic pressure. (Definition). iv. Biomagnification and Eutrophication. ( Effect). v. Myopia and Hypermetropia. (Cause) (5) b. The diagram given below shows the internal structure of the lamina and midrib of a leaf. Study the same and answer the questions that follow. i. Label parts 1 to 4. ii. What is the function of the part labeled 3? iii. Explain how part 3 performs the function mentioned by you. iv. Trace the path of water from xylem of stem to the atmosphere. (2) (1) (1) (1) Question 3 a. Given below is a diagrammatic representation of the internal structure of an organelle found in a plant cell. i. Name the organelle. ii. Label parts 1 and 2. iii. Name the physiological process occurring in this organelle. iv. Mention any one benefit of this physiological process to man. v. Mention the phases of the physiological process occurring in Part 1 and Part 2. vi. Name the products formed at the end of the phase occurring in Part 1. b. Expand the following abbreviations. i. ICSH ii. NADPH iii. ABA ( ) (1) ( ) (1) (1) (1) (2 ) iv. ATP v. SPM c. i. Mention any two harmful effects of nuclear pollution to man. ii. What are the causes of Air pollution? (any two) iii. What is Green House Effect? (1) (1) ( ) Question 4 a. Given below is the diagram of internal structure of human brain. Study it and answer the questions that follow. i. Label parts 1 to 4. ii. Name the parts/structures that perform the following function. (1) Connects the cerebral hemispheres. (2) Controls the body temperature. (3) Controls reflexes below neck. (4) Acts as relay centre to the cerebrum. iii. Compare the arrangement of axons and cytons in cerebrum and Part 2. (2) (2) (1) b. Define the following. i. Accommodation of the eye. iv. Cell cycle ii. Hemizygous condition v. Impulse (5) iii. Hormone Question 5 a. i Draw a neat diagram of the internal structure of eye and label the parts that perform the following function. (2+2) 1. Alters the shape and size of the lens. 2. The front bulged part of sclera. 3. The photosensitive layer. 4. The circular pigmented disc that alters the size of the pupil. ii. . Define persistence of vision. (1) b. Mention the function of each of the following. i. Ear ossicles ii. Lymphocytes. iv. Centrosome v. Prostate gland. (5) iii. Coronary artery Question 6 a. The diagram given below is that of a developing human foetus in the womb. Study the same and answer the questions that follow. i. Name the parts indicated by the guidelines 1 to 4. ii. Name the extra embryonic membranes surrounding the foetus. iii. Name the fluid surrounding the foetus and also mention its function. iv. From which part of the uterus does part 1 develop? v. Mention any two substances crossing part 1 and entering the foetal blood. vi. Name the hormones secreted by part 1 for maintenance of pregnancy. (2) (1) (1) ( ) (1) ( ) b. Draw a neat diagram of the experimental set-up to demonstrate evolution of oxygen during photosynthesis. (3) c. State Mendel s Law of Independent Assortment. (1) Question 7 a. Give biological term for the following. i. Onset of menstruation in a young girl around the age of 13yrs. ii. An eye defect in which the cornea becomes uneven. iii. The process by which cells engulf pathogens. iv. Exudation of sap from injured parts of a plant. v. Alteration in the structure of a gene which may or may not be inherited. b. Give reasons for the following statements. i. Wilted lettuce leaves become crisp / firm when placed in cold water for a while. ii. One feels blinded for a short time while coming out of a dark room. iii. Gametes have haploid number of chromosomes. (5) (3) c. Classify the following as functions of sympathetic nervous system and parasympathetic nervous system. (2) Stimulates peristalsis, Dilates pupil, Speeds up heart beat, Inhibits release of glucose

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