BIOLOGY— 2003 (Set I—Outside Delhi)
SECI1ON - 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 type 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. A digestive juice with a pH of approximately 2 is found inside the
Q. 2. What was the most significant conclusion that Mendel drew from his experiments? 1
Q. 3. Which of the following is not a useful function of the light reactions in photosynthesis? 1
Q. 4. In the flammatory response, the absence of which one of the following would prevent all the others from happening? 1
Q. 5. A biogeographical evidence in favour of organic evolution is provided by
Q. 6. Which type of immunity is provided by vaccinations? 1
Q. 7. Name the tissue involved in linear and lateral growth in plants. 1
Q. 8. Why are proteases generally released an inactive form? 1
SECTION - B
Q. Nos. 9-18 are of short answer type carrying 2 marks each. Answer them in 20-30 words each.
Q. 9. What is SA node? Where it located and what is its function? 2
Q. 10. What is reproductive isolation? What is its significance? 2
Q. 11. Give the scientific name of the pathogen causing Diphtheria. How is it transmitted? 2
Q. 13. Name the hormone responsible for the descent of testes into the scrotum. Why does the failure of the process result in sterility? 2
Q. 15. What is ELISA test? Give its full form. Give-two examples of its application 2
Q. 17. Explain inhibitory effect of auxins with the help of one example. 2
SECTION - C
Q. Nos. 19-2 7 are of short answer type carrying 3 marks each. Only one of these questions (Q. 27) based on drawing skill has internal choice. Answer the rest in 30-50 words each.
Q. 19. What is metastasis? List any four danger signals of cancer. 3
Q. 27. Draw a diagram of the human duodenum and the associated digestive glands. Label the glands and their respective ducts pouring into the duodenum. 3
SECTION - D
Q. Nos. 28-30 are long answer type carrying 5 marks each. Of these two questions Q. Nos. 29 and 30 have internal choice. Answer the question in approximately in 80- 120 words each.
Q. 29. Describe the hormonal control of menstrual cycle in humans.
Biology 2003 Question Papers Class XII
CBSE 2003 Question Papers Class XII