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ISC Class XII Board Exam 2020 : Biology

5 pages, 55 questions, 0 questions with responses, 0 total responses,

Navneet Goswami
St. Joseph's College (SJC), Nainital
X-XII PCB

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BIOLOGY PAPER 1 (THEORY) (Maximum Marks: 70) (Time allowed: Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) ----------------------------------------------------------------------------------------------------------------This paper comprises TWO PARTS Part I and Part II. Answer all questions. Part I consists of one question of 20 marks having six subparts. Part II consists of Sections A, B and C. Section A consists of seven questions of two marks each. Section B consists of seven questions of three marks each, and Section C consists of three questions of five marks each. Internal choices have been provided in two questions in Section A, two questions in Section B and in all three questions of Section C. The intended marks for questions or parts of questions are given in brackets [ ]. -----------------------------------------------------------------------------------------------------------------PART I (20 Marks) Answer all questions. Question 1 (a) Answer the following questions briefly and to the point: (i) How many chromosomes are present in male gamete of a rat? (ii) Why is haemophilia uncommon in females? (iii) Name the disease-resistant variety of cowpea developed by plant breeding technique. (iv) Define Brood parasitism. (v) Name the vegetative propagule of Bryophyllum. (vi) Which geological era was dominated by reptiles? (vii) Define polygenic inheritance. [8 1] (viii) What is Dobson unit? -----------------------------------------------------------------------------------------------------------------This Paper consists of 5 printed pages and 1 blank page. 1220-863A Copyright reserved. Turn over

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