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ICSE Prelims 2018 : Biology

4 pages, 27 questions, 11 questions with responses, 11 total responses,

Ishita Sharma
Mount Carmel School (MCS), Gaggal, Kangra
Nursery to 10th Science and geography

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http://www.boardguess.com IMPORTANT QUESTION PAPER BIOLOGY CLASS - X Q.1. Name the following : (i) The two kinds of cell division found in living organisms. (ii) The kind of cell division normally seen at the tip of root and shoot system. (iii) The point at which the duplicated chromosomes are joined. (iv) The largest phase of a normal cell cycle. (v) The points where crossing over occurs. (vi) The stage when chromosomes arrange at the equator. (vii) The kind of division takes place in the reproductive tissues. (viii) Acts as a bearer of heredity units. (ix) A region of plant body where cell division occurs very actively. (x) The type of cell division that occurs during : (a) Growth of shoot. (b) Formation of pollen grains. (c) Repair of worn out tissues. (xi) Two animals which have nineteen pairs of chromosomes. Q .2. State whether the following are true or false : (i) The chemical present in gene is RNA. (ii) Both the identical allele are called homozygous. (iii) The genetic make up of an organism is called phenotype. (iv) Two arms of a chromosome is called centromere. (v) The plant used by Mendel was sweet pea. This article is the property of BoardGuess.com. Any unauthorized use is strictly prohibited. Please visit http://www.boardguess.com for more information. http://www.boardguess.com Q .3. Rewrite the wrong statement by inserting a word/words. Death rate is the number of deaths of a given population per year. Q.4. Expand the following : (i) DNA (ii) AIDS. Q.5. Explain the term plasmolysis. Give one application of this phenomenon in our daily life. Q.6. Explain the following terms : (i) Bleeding (ii) Transpiration. Q.7. Define : (i) Photophosphorylation. Q.8. Differentiate between : (i) Medulla oblongata and Cerebellum. (ii) Cerebrum and spinal cord. (iii) Cerebrum and Cerebellum. (iv) Sensory and motor neuron. (v) Sensory and motor nerve. Q.9. Describe the function of : (i) Eustachian tube. (ii) Iris of the eye. (iii) Ear ossicles. Q. 10. What is meant by gestation period ? Q.11. Why people living in hilly regions usually suffer from simple goiter. Answers Q.1. (i) Mitosis, Meiosis. (ii) Mitosis. (iii) Centromere. (iv) Prophase. (v) Chiasmata. (vi) Metaphase. (vii) Meiosis. (viii) Chromosomes / Chromatin network. (ix) Growing points. (x) (a) Mitosis, (b) Meiosis, (c) Mitosis. (xi) Lion, Tiger. Q.2. (i) F (ii) T (iii) F (iv) F (v) F. Q.3. Death rate is the number of deaths per 1000 people of a given population per year. This article is the property of BoardGuess.com. Any unauthorized use is strictly prohibited. Please visit http://www.boardguess.com for more information. http://www.boardguess.com Q.4. (i) DNA = Deoxyribose Nucleic Acid. (ii) AIDS = Aquired Immuno Deficiency Syndrome. Q.5. Shrinkage of protoplast of a plant cell from its cell wall under the influence of hypertonic solution is called plasmolysis and the cell in this state is said to be limp or flaccid. This condition is called flaccidity. Adding salt in pickles and sugar in jams, jellies, preserve them from decaying by plasmolysing the bacterial cell. Q.6. (i) Bleeding : Exudation of sap or watery solution from the cut or injured parts of a plant is called bleeding. (ii) Transpiration : is the loss of water in the form of water vapours from the aerial parts of plants. Q.7. (i) Conversion of low grade energy ADP into high potential chemical energy ATP is called photophosphorylation. Q.8. (i) Medulla oblongata: Concerned with respiratory movements, heart beat and dilation of blood vessels. Cerebellum: Regulates and coordinates muscular contraction and body balance. (ii) Cerebrum : It contains cell bodies of neurons outside and axons of the neurons inside. Spinal cord: It contains axons outside and cell bodies inside. (iii) Cerebrum : Seat of intelligence, memory and control of voluntary activities. Cerebellum : Coordinates muscular activities and maintains body balance. (iv) Sensory neuron : It transmits stimulus from the receptor organ to the CNS. Motor neuron : It transmits stimulus from the CNS to the effector organ. (v) Sensory nerve : Dendrites longer than axon and made up of unipolar neuron. Motor nerve : Axon longer than dendrites and made up of multipolar neuron. This article is the property of BoardGuess.com. Any unauthorized use is strictly prohibited. Please visit http://www.boardguess.com for more information. http://www.boardguess.com Q.9. (i) It serves to adjust the pressure inside the middle ear to the change in the atmospheric pressure for normal hearing so that the tympanum is not affected by high pressure. (ii) The radial and circular muscles of the iris contract or relax and hence the size of the pupil is adjusted. (iii) It transmits and increase the magnitude of vibrations to inner ear. Q.10. The time interval between implantation and birth is called gestation period. Q.11. The soil and water in hilly region is deficient in Iodine. Paper By Shivam Singh (Delhi) This article is the property of BoardGuess.com. Any unauthorized use is strictly prohibited. Please visit http://www.boardguess.com for more information.

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