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ISC Specimen 2015 Biology Paper 1 (Theory)

4 pages, 52 questions, 40 questions with responses, 91 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 Punnett-square used for? (iv) (b) What happens if excess fertilizers are added to the soil? Malignant tumours are considered dangerous. Why? Each of the following statements/ questions has four suggested answers. Choose the correct option in each case: 1. [4] Gene therapy can be used to correct one of the following: (i) SCID (ii) HIV (iii) Typhoid (iv) Hepatitis ---------------------------------------------------------------------------------------------------------------------------62 ISC SAMPLE QUESTION PAPER 2015

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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 Which of the following statements is correct? (i) (ii) In E.T. techniques, embryos are always transferred into the uterus. (iii) Oral pills are very popular contraceptives among the rural women. (iv) 4. Surgical methods of contraception do not prevent gamete formation. All STDs are not completely curable. 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: (i) 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) Development of fruit without fertilization. (ii) The surgical removal of a section of vas deferens. Expand the following abbreviations: (i) GIFT (iii) DNA (iv) [4] PKU (ii) (e) [4] GMO Name the scientists who have contributed to the following: (i) Principle of Limiting Factor. (ii) The recapitulation theory. (iii) Discovered the fossil of Archaeopteryx. (iv) [4] Described double fertilisation in plants. ---------------------------------------------------------------------------------------------------------------------------63 ISC SAMPLE QUESTION PAPER 2015

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PART II (50 Marks) SECTION A Answer any two questions. Question 2 (a) Describe different types of natural selection with the help of graphs. [3] (b) Give two chromosomal similarities between man and apes. [1] (c) Give two distinguishing features of the Cro-Magnon man. [1] Question 3 (a) Describe how the origin of life from abiotic substances was proved experimentally by Miller and Urey. [3] (b) Give one significant difference between Biogeny and Cognogeny. [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 Australopithecus. [1] (c) Define atavism. [1] SECTION B Answer any two questions. Question 5 (a) Draw a well labelled diagram of the L.S. of an anatropous ovule just before fertilization. [4] (b) Write short notes on the following: [4] (i) (ii) (c) Endosperm Amniocentesis Give four significant differences between active and passive absorption of water in plants. [2] ---------------------------------------------------------------------------------------------------------------------------64 ISC SAMPLE QUESTION PAPER 2015

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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) Racemose and Cymose inflorescence (ii) Self-pollination and Cross pollination Write a brief note on MTP. [4] [4] [2] Question 7 (a) Fertilization in humans is a physio-chemical process. Explain. [4] (b) Give a graphical representation of the C4 cycle. [4] (c) Give the names of foetal membranes in mammals. [2] SECTION C Answer any two questions. Question 8 (a) Describe lac-operon. [4] (b) What are green manures? Why are biofertilisers preferred over chemical fertilisers? [4] (c) Define: (i) Biopiracy (ii) Pleiotropy [2] Question 9 (a) Define hybridization. Explain the technique of hybridization in plants. [4] (b) What are the implications of the loss of biodiversity? [4] (c) Give one significant difference between: [2] (i) Hydrophytes and Xerophytes (ii) Inbreeding and Outbreeding Question 10 (a) Give four applications of recombinant DNA technology. [4] (b) Write short notes on: [4] (i) (ii) (c) Haemophilia Down s Syndrome Explain the process of sex determination in humans. [2] ---------------------------------------------------------------------------------------------------------------------------65 ISC SAMPLE QUESTION PAPER 2015


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