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ISC Specimen 2016 Biology Paper 1

4 pages, 53 questions, 39 questions with responses, 64 total responses
Indian School Certificate Examination (ISC), New Delhi
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BIOLOGY PAPER - 1 (THEORY) (Botany and Zoology) (Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) -------------------------------------------------------------------------------------------------------------------------Answer all questions in Part I and six questions in Part II, choosing two questions from each of the three sections A, B and C. All working including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer. The intended marks for questions or parts of questions are given in brackets [ ]. -------------------------------------------------------------------------------------------------------------------------- PART I (20 Marks) Answer all questions. Question 1 (a) Give a brief answer for each of the following: [4] (i) (ii) Why are the annual rings absent in plants growing along the coastal areas? (iii) What is a test cross? (iv) (b) What will happen if transpiration exceeds the amount of water absorbed? AIDS virus is called as retrovirus. Explain why? Each of the following questions/ statements has four suggested answers. Choose the correct option in each case: 1. [4] Which of the following shows heterozygous condition? (i) Rr (ii) RR (iii) Rr (iv) None of these -------------------------------------------------------------------------------------------------------------------------1 ISC SPECIMEN QUESTION PAPER - 2016

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2. The dark coloured dead wood present in the central region of old trees is called: (i) (ii) Sap wood (iii) Duramen (iv) 3. Spring wood Alburnum Leydig cells secrete: (i) (ii) Testosterone (iii) Progesterone (iv) 4. Oestrogen Corticosterone The Hardy Weinberg s equilibrium is associated with: (i) (ii) Population genetics (iii) Osmotic balance (iv) (c) Ionic equilibrium None of these Give a scientific term for each of the following: [4] (i) (ii) The process of mRNA synthesis on a DNA template. (iii) A plant part excised from its original location and used for initiating a culture. (iv) (d) Pollination by insects. Fixation of blastocyst to the endometrium. Expand the following abbreviations: (i) RUBISCO (iii) SCP (iv) (e) YAC (ii) [4] DDT Name the scientists who have contributed to the following: (i) Mutation (ii) Proposed Lac Operon (iii) Discovered the fossil of Archaeopteryx. (iv) [4] Rh factor. -------------------------------------------------------------------------------------------------------------------------2 ISC SPECIMEN QUESTION PAPER - 2016

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PART II (50 Marks) SECTION A Answer any two questions. Question 2 (a) Explain DDT resistance in mosquitoes in natural selection. [3] (b) Give two chromosomal similarities between man and apes. [1] (c) Give two differences between Homologous and Analogous organs. [1] Question 3 (a) Give an account of the Oparin Haldane Theory of Origin of life. [3] (b) Give one significant difference between continuous and discontinuous distribution. [1] (c) What is a vestigial organ? Give one example. [1] Question 4 (a) What are the basic postulates of Darwinism? What is the objection against Darwinism? [3] (b) Write two distinctive features of Homoerectus. [1] (c) Define Coacervates. [1] SECTION B Answer any two questions. Question 5 (a) Give four differences between C3 and C4 cycles. [4] (b) Write short notes on the following: (i) Kranz anatomy (ii) Double fertilization [4] (c) Give four contrivances for prevention of self pollination. [2] Question 6 (a) (b) (c) Briefly describe the mechanism of development of a dicot embryo. Give two significant differences between each of the following: (i) Epigynous and hypogynous ovary (ii) Menarche and menopause Write a brief note on MTP. [4] [4] [2] -------------------------------------------------------------------------------------------------------------------------3 ISC SPECIMEN QUESTION PAPER - 2016

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Question 7 (a) Draw a neat labelled diagram of the internal structure of the testes. [4] (b) Differentiate between: [4] (i) (ii) (c) Monadelphous and diadelphous stamens Fertilisation and Parturition Define: [2] (i) Root pressure (ii) Guttation SECTION C Answer any two questions. Question 8 (a) Explain the process of DNA fingerprinting. Give two applications of the same. [4] (b) Explain the role of bacteria in improving soil fertility. [4] (c) Define: (i) Pisciculture (ii) Patents [2] Question 9 (a) Define succession. State and explain the different kinds of succession. [4] (b) Give the causes of population growth. [4] (c) Give one significant difference between: [2] (i) B cells and T cells (ii) Antibodies and interferons Question 10 (a) Explain incomplete linkage in Drosophila. [4] (b) Give the causative agent and symptoms of the following diseases: [4] (i) Typhoid (ii) Amoebiasis (iii) Ringworm (iv) Swine flu (c) Give four reasons for Mendel s success. [2] -------------------------------------------------------------------------------------------------------------------------4 ISC SPECIMEN QUESTION PAPER - 2016


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