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Kasturi Shikshan Sanstha s Pratima Palande School (ICSE) PRELIMINARY EXAMINATION (2020-2021) BIOLOGY CLASS: 10 MARKS: 80 DATE: 01.03.2021 TIME: 2 HRS Answers to 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 in reading the Question Paper. The time given on 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 structure formed by coiling and supercoiling of chromatin fibres. (ii) A disease in which hypoglycemia and increased susceptibility to infections is seen. (iii) The duct which conducts the secretion from eyes to the nose. (iv) The apparatus which do not measure the water lost during transpiration but measure the water uptake by the cut shoot. (v) The reversal of plasmolysis. (b) Choose the correct answer from the four options given below: i) The membrane which fails to act as a semipermeable membrane is a) Cellophane paper b) Visking bag c) Egg membrane d) Rubber sheet ii) Glucose produced during the process of photosynthesis will not be a) Immediately consumed by the plants b) Reutilized for the process of diffusion. c) Used for synthesizing fats, proteins etc. d) Converted to sucrose. iii) The old and weak RBCs are not destroyed in a) Stomach b) Liver c) Spleen d) Bone marrow [5] iv) Out of the following statements, only one is true with regard to L.S. of kidney a) An inner dark cortex and outer lighter medulla. b) An outer dark cortex and an inner lighter medulla. c) Outer cortex and inner medulla both are light. d) Inner medulla and outer cortex both are dark. v) The condition affecting older people who cannot see near objects clearly is a) Hyperopia b) Long sightedness c) Astigmatism d) Presbyopia (c) Rearrange and write the terms given below so as to form a logical sequence: (i) (ii) (iii) (iv) (v) Axon, Cyton, Synapsis, neurotransmitter. Cornea, Conjunctiva, Pupil, Retina, Lens. Brain, CNS, Medulla oblongata, Cerebrum, Cerebellum. Xylem, Endodermis, Pericycle, Root hair, Cortex. Palisade mesophyll, Lower epidermis, Sub-stomatal space, Spongy mesophyll, Cuticle. (d) State the chief function of the following: (i) (ii) (iii) (iv) (v) [5] [5] Centromere Cell wall Antibodies Grana Allosomes (e) Rewrite the passage by filling the blanks with appropriate words: The autonomic nervous system consists of a pair of chains of nerves and either side of the 2 . This system controls the 3 internal organs. There are two part of ANS i.e. Sympathetic and 4 sympathetic nervous system is stimulated by the hormone 5 the adrenal gland. (f) Write the full forms of the following abbreviations: (i) ACTH (ii) PNS (iii) WBC (iv) Hb.CO2 (v) NADPH [5] 1 on actions of the . The secreted by [5] (g) State whether the following statements are true or false. If false, rewrite the false statements by changing the first or last word/words: [5] (i) Karyokinesis is generally followed by G1 phase in the cell cycle. (ii) Diffusion is a phenomenon by which the living or dead plant cells absorb water by surface attraction. (iii) Photons are used in converting ADP to ATP by adding one phosphate group. (iv) Blood pressure can be measured with the help of an instrument called manometer. (v) Receptor is an organ which responds to motor nerve impulse. (h) Given below is a diagram of pituitary gland. Study the diagram carefully and answer the question the follows: [5] (i) Write the exact location of pituitary gland. (ii) Why it is called as master gland . (iii) What do you mean by tropic hormone . Give an example. (iv) Name the different hormones which are secreted by posterior pituitary. (v) Explain the role of FSH in female body. SECTION II (40 Marks) (Attempt any four questions from this section) Question 2 (a) An apparatus as shown below was set-up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the jar. [5] (i) Name the process being studied. (ii) Explain any two advantages of this process to the plants? (iii) Why was the pot covered with a plastic sheet? (iv) Suggest a suitable control for this experiment. (v) List any two adaptations done by the plants to reduce the above mentioned process. (b) Distinguish between the following pairs based on the criteria given in brackets. [5] (i) Hormone and Enzyme. (Chemical nature). (ii) Exophthalmic goitre and simple goitre (Cause) (iii) Renal cortex and renal medulla (Which part of nephron lies in them) (iv) Neuron and Nephron (Working) (v) Diabetes mellitus and Diabetes insipidus. (Cause). Question 3 (a) The diagram below represents the structure of human ear. Study the same and answer the following: [5] (i) Name the parts which are present in outer ear. (ii) State the functions of the parts B and E seen in the diagram. (iii) Name the structure which is present in part labelled D responsible for hearing and also the membrane on which it is present. (iv) Explain the terms dynamic and static balance. (b) Define: (i) Myocardial infarction (ii) Diuresis (iii) Root pressure (iv) Accommodation (v) Ganglia [5] Question 4 (a) 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. ii. iii. iv. Identify the phase giving reason. Label the parts as shown by the guidelines. Name the structure which prevents the upturning of valves during ventricular contraction. Explain how the sound DUP is generated during heartbeat. (b) Draw a well labelled diagram of root hair as it would appear if an excess of fertilizer is added to the soil. [5] Question 5 (a) The diagram given below shows two test-tubes A and B. Test tubes A contains a green water plant. Test-tube B contains both green water plant and a snail. Both test tubes are kept in sunlight. Answer the questions that follow: [5] (i) (ii) (iii) (iv) (v) Name the physiological process that releases the bubbles of oxygen. Explain how the above mentioned physiological process is beneficial to humans. What is the purpose of keeping a snail in the test tube B? Why does the test tube B have more bubbles of oxygen? Write the overall chemical equation for the above process. (b) Complete the following table on mammalian blood: Components Erythrocytes Leucocytes Platelets Origin Chief function [5] Number/mm3 Life span Question 6 (a) The diagram below represents a phase during cell division. Study the same and answer the questions that follow: (i) Name the parts labelled A, B and C. (ii) Identify the above stage and give a reason to support your answer. (iii) Name the stage which comes prior to this stage and draw a labelled diagram to represent the same. (iv) Write two major differences between mitosis and meiosis division. [5] (b) Give reasons: i. ii. iii. iv. v. [5] The right kidney is slightly lower in position than the left. Leeches lose their grasp on sprinkling salt on them. Seeing the teacher entering the classroom, students generally stand up without any conscious effort. Pancreas is also called as mixed gland . Meiosis is very important for survival of a species. Question 7 (a) (i) Draw a well labelled diagram of a Malpighian capsule. (ii) Explain the cause of the following kidney disorders 1. Haematuria 2. Glycosuria 3. Albuminuria 4. Gout (b) Given below is a diagram of human brain. Study the diagram carefully and answer the questions that follow: i. ii. iii. iv. v. Name the three main parts of the brain visible externally. What are Gyri and sulci in the brain? Mention one important function of midbrain. What is meningitis? Explain any two functions of CSF. ********** [3] [2] [5]
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