BIOLOGY— 2003 (Set II—Delhi)
Note: Except for the following questions, all the remaining questions have been asked in Set I.
SECTION - A
Q. Nos. 1-8 are of very short answer type carrying 1 mark each. Of these the first five questions are of multiple choice which have to be answered simply as A, B, C or D. The remaining questions have to be answered in approximately 1-20 words each.
Q. 1. Which statement correct regarding Biston betularia, a species of moth found in England during the late 19th century?
Q. 2. Which of these is not a part of the inflammatory response?1
Q. 3. Placing a ripe apple in a bag of green bananas will cause them to ripen quickly. This occurs because the apple.1
Q. 4. When alleles move into different gametes, this demonstrates 1
Q. 5. Which ion is involved in blood clotting?1
Q. 8. Give the full form of SCID. 1
SECTION - B
Q. Nos. 9-18 are of short answer type carrying 2 marks each. Answer them in 20-30 words each.
Q. 11. Describe how the foetus with Rh-positive blood gets affected if the mother is Rh-negative. 2
Q. 12. Name the ear ossicles in the order of arrangement in humans. What roles do they play in hearing? 2
SECTION - C
Q. Nos. 19-27 are of short answer type carrying 3 marks each. Only one of these questions (Q. 27) based for drawing skill has internal choice. Answer, the rest in approximately 30-50 words each.
Q. 20. What is root pressure? How can you demonstrate it experimentally? 3
Q. 22. Name the disorder in which the immune mechanism of the body of a patient gets suppressed. Which pathogen is responsible for it? Give any two methods of its transmission? 3
SECTION - D
Q. Nos. 28-30 are long answer type carrying S marks each of these two questions. Q. Nos. 29 and 30 have internal choice. Answer the questions in approximately 80-120 words each.
Q. 28. Describe the C4 pathway in a sugarcane plant. How is this pathway an adaptive advantage to the ptant? 5
Q. 30. What is cardiac cycle? Describe the events that occur during joint diastole and atrial systole. 5
Biology 2003 Question Papers Class XII
CBSE 2003 Question Papers Class XII