BIOLOGY— 2003 (Set I—Compartment 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. Pick out the monoecious plant from the following:
Q. 2. Diabetes mellitus is explained below in four statements. Pick out the false statement
Q. 3. A boy-has the blood group AB. What is true of the inheritance of this blood Group in his case?
Q. 4. The descendant of Colewort is
Q. 5. Fever, cough, sputum containing blood, pain in the chest and loss of body weight are symptoms of
Q. 6. In some germinating seeds, enzymes mobilise nutrients in the cotyledons. Name the phytohormone that stimulates the production of such enzymes.
Q. 8. Name the enzyme that catalyses the formation of carbonic acid in erythrocytes.
SECTION - B
Q. Nos. 9-18 are of short answer type carrying 2 marks each. Answer them in approximately 20 words each
Q. 10. Differentiate between transpiration and guttation. Name the morphological parts related with these two processes.
Q. 11. Explain the scientific reason for growing Azolla pinnala in a rice field.
Q. 12. Name the first germ layer that gets differentiated from the inner mass of cells of the mammalian blastula. Name any one organ developed from this germ layer.
Q. 14. Mention the function of
Q. 17. How does gravitational water differ from capillary water in the soil? Which one of these is available to the plant?
Q. 18. An aquarium fish and a pigeon 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 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 approximately 30-50 words each.
Q. 19. What for is amniocentesis performed? Explain the procedure.
Q. 22. What are LDL and HIDL? Which one of them is harmful and how?
Q. 24. Expand MRI How is this technique superior to CT scan?
Q. 25. In which organ are Leydig cells and Sertoli cells located? Differentiate between these cells with reference to their location in the organ and their functions.
Q. 26. The police department could obtain a bunch of hair from the gripped hand of a murdered man. There were two persons suspected in this criminal case. How will the forensic department give a clue to the actual criminal’ Explain the technique
Q. 27. Draw a labelled diagram of a portion of sectional view of retina showing its basic structure (No description is required).
SECTION - D
Q. Nos. 28-30 are long answer type carrying 5 marks each. Q. Nos. 29 and 30 have internal choice. Answer these questions in approximately 80-120 words each.
Q. 28. (a) Schematically represent the various steps in cyclic photophosphorylation in Angiosperms.
Q. 29. (a) Draw the LS. of human heart showing the internal structure. Label the parts of the left side of the heart and the blood vessels that enter and leave the chambers of the same side.
Q. 30. The diagram below illustrates the attack of a virus on a host cell.
(a) Name the parts numbered 1 and 2.
Biology 2003 Question Papers Class XII
CBSE 2003 Question Papers Class XII