BIOLOGY— 2003 (Set I—Compartment Outside Delhi)
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 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. The functions of bile are listed below Pick out the false statement.
Q. 2. A woman is a sickle cell carrier. What is true of the Inheritance of this genetic disorder in this woman?
Q. 3. Muscular rigidity, lockjaw and painful spasm are main symptoms of
Q. 4. One of the plants bearing inflorescence showing dichasial cyme is
Q. 5. The tetraploid ancestor of the modern wheat is
Q. 6. Some plants close their stomata to conserve water under severe drought conditions. Name the phytohormone that helps them to do so.
Q. 8. Name the cells that synthesisie collagen.
SECTION - B
Q. Nos. 9-18 are of short answer type carrying 2 marks each. Answer them in approximately 20-30 words each.
Q. 10. Describe the role of potassium ions in the opening and closing of stomata.
Q. 11. Explain the scientific reason for growing a leguminous crop like groundnut prior to a cereal crop.
Q. 12. Why is a mammalian heart referred to a myogenic?
Q. 14. Mention the modified function of:
Q. 17. Why do some herbaceous plants have hydathodes? Under what conditions do they help the plants?
Q. 18. A pigeon and a cat were fed on protein diet. In what different forms would they excrete their nitrogenous wastes? Why do they excrete so differently?
SECTION - C
Q. Nos. 19-27 are o 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 approximately 30-50 words each.
Q. 19. Test tube baby is a boon to a Woman who cannot conceive normally Explain the procedure involved 3
Q. 22. What are LDL and HDL? Which one of them is useful and how’
Q. 24. Why does our body temperature rise when infected. How does moderate fever help in body defence?
Q. 25. What is meant by a portal vien? Name the two portal veins in the human body Specify the function of any one of them
Q. 26. Two claimant fathers filed a case against a lady, claiming to be the father of her only daughter. How could this case be settled Identifying the real biological father?
Q. 27. Draw a vertical section of the human eye and label any six of those parts only through which the light rays pass and fall on the retina.
SECTION - D
Q. Nos. 28-30 are long answer type carrying 5 marks each Q. Nos. 29 and 30 have internal choice Answer the questions in approximately 80-120 words each.
Q. 28. (a) Schematically represent non-cyclic photophosporylation in Angiosperms, giving nil the components
Q. 29. (a) Draw a labelled sketch of a myelinated neuron showing one motor end plate.
Q. 30. Illustrated below is a DNA segment which constitutes a gene:
(a) Will the whole gene be transcribed into RNA primarily? State “yes” or “no”.
Biology 2003 Question Papers Class XII
CBSE 2003 Question Papers Class XII