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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.

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