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CBSE Class 11 Pre Board 2019 : Biology (St Xavier's Sr. Sec. School, Delhi)

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Annual Examination in BIOLOGY Std. 11 28-2-2019 Time : 3 hrs. Max. Marks : 70 General Instructions: i) All questions are compulsory. ii) The question paper consists of four sections A, B, C and D. iii) Internal choice is given in all the sections. iv) A student has to attempt only one of the alternatives in such questions. v) Section A contains 5 questions of 1 mark each. vi) vii) viii) ix) Section B has 7 questions of 2 marks each. Section C is of 12 questions of 3 marks each. Section D has 3 questions of 5 marks each. Wherever necessary, the diagrams drawn should be neat and properly labeled. SECTION - A (1 x 5 = 5 marks) 1. How will you identify Monocots from Dicots on the basis of their leaves? 2. Identify and label any one of the given diagram and explain the modification shown in this diagram:- 3. Do you think that the phenomenon of Photoperiodism is same as Phototropism? 4. Name the mineral which can cause the deficiencies of Fe, Mg and Ca, if supplied in excess. 5. What are the various parts of Henle s loop of nephron? (OR) Why are the digestive enzymes secreted in their inactivated form? SECTION - B (2 x 7 = 14 marks) 6. a) b) What is the function of water vascular system? Define metamerism with an example. 7. Sketch the Haplo-diplontic life cycle. 8. Identify ANY ONE of the given diagrams and explain it:- 9. Differentiate between simple and compound epithelium. (OR) Compare the structure of cartilage and bones. Std. 11 -2- BIOLOGY 10. Enumerate the salient features of the cell theory and name the scientists who proposed it? 11. Answer the following briefly:a) Why there is a need of duplication of genetic material in a cell before cell division? b) What is the main difference between Anaphase of Mitosis and Anaphase I of Meiosis I? 12. What is the Biological method of nitrogen fixation? SECTION - C (3 x 12 = 36 marks) 13. Explain the international naming system for the living organisms in detail with at least two examples. 14. Draw a root tip and explain the various regions of it along with their functions. 15. a) b) 16. a) b) c) 17. Mark the correct answer:a) Chromosome replication occurs during i) Metaphase ii) S-phase How do the functions of xylem and phloem differ? Are there any tissue elements of phloem which are comparable to those of xylem? (OR) What are the three different types of meristems, explain the location in a well labeled diagram and describe the function of each? Can a eukaryotic cell survive without a nucleus? What are the main elements of the nucleus? Compare the Prokaryotic and Eukaryotic nucleus. iii) Anaphase iv) G2-phase b) After mitosis, the number of chromosomes in the daughter cells shall be i) one fourth of parent cell ii) one half of parent cell iii) twice of the parent cell iv) same as the parent cell c) The correct sequence of different phases of mitosis is i) Anaphase Metaphase Prophase Telophase Inter phase ii) Inter phase Telophase Metaphase Anaphase Prophase iii) Metaphase Anaphase Telophase Prophase iv) Inter phase Prophase Metaphase Anaphase Telophase d) Separation of chromosome daughters takes place at i) Telophase ii) Metaphase iii) Anaphase e) Decision of G0-phase occurs i) Towards the end of G1-phase iii) At the end of telophase f) Who found that new cells develop from pre-existing cells? i) Remak ii) Virchow iii) Prevost and Dumas 18. a) b) What is the criteria of the essentiality of the nutrients? How can we develop plants without soil? 19. Differentiate between Cyclic and Non-cyclic photophosphorylation. ii) iv) iv) Prophase Before middle of G1-phase Towards end of cytokinesis iv) Strasburger Std. 11 20. -3- BIOLOGY Draw a well labeled diagram of any one of the following:The duct system of liver, gall bladder and pancreas. (OR) Respiratory system of human beings. 21. a) Explain the following diagram and write down its importance:- b) What is double circulation of blood? 22. Represent a table indicating any three hormones of human endocrine system giving their location in the body, Hormone, function of the hormone and disorders due to inadequate secretions. (OR) Draw a reflex arc and explain the mode of conduction through it. 23. Explain the conduction of nerve impulse through a synapse. (OR) Mention the functions of the various parts of the human brain. 24. Answer the following:a) Site of light reaction in a chloroplast _____________. b) The Phytohormone that regulates abscission and dormancy __________. c) The Phytohormone that promotes inter-nodal elongation _________. d) The plant growth regulator that supports apical dominance ________. e) The concentration of the essential element below which plant growth is retarded ______. f) The wavelength of the light colour that shows maximum absorption during photosynthesis ___________. SECTION - D (5 x 3 = 15 marks) 25. Differentiate between the equational and reductional cell division. (OR) a) Draw the diagram of a plant cell as it is observed under electron microscope. b) Explain the point of view of Singer and Nicholson about Plasma membrane structure in few sentences. 26. Draw the diagram of the human heart in longitudinal section and describe the flow of blood through it. (OR) Describe the detailed structure of a Nephron and Mention the three steps process of urine formation. 27. Give the diagrammatic representation of the Hatch and Slack pathway and explain the utility of this pathway for plants. (OR) Explain the cyclic flow of Nitrogen through living and non-living components of the Biosphere. -x-x-x-x-x-x-x-

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