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ISC Board Specimen 2011 : Biology Paper 2 (Practical)

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi
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BIOLOGY Paper - 2 (Practical) (Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) -------------------------------------------------------------Answer all questions. All working including rough work, should be done on the same sheet as the rest of the answer. The intended marks for questions or parts of questions are given in brackets[ ]. ---------------------------------------------------------------------------------------------------------------Question 1 [5] (a) Cut the floral head (capitulum) of specimen D-41 into two equal (longitudinal) halves. From one of the halves isolate one outer flower (ray floret) and one central or inner flower (disc floret). Put these florets on a wet filter paper. Examine the two florets carefully with the hand lens and describe the general floral characters of each in botanical terms. (b) Make large drawings of the ray floret and also the disc floret. Label the parts. (c) Split open the corolla tube of a disc floret with a fine needle and spread the corolla to expose the androecium and the upper part of the gynoecium. Study with a hand lens the structure and position of stamens in relation to the style, stigma and petals. Make a neat labeled drawing of the parts found above the ovary. (d) Draw the floral diagram of each floret. (e) Write the floral formula of each floret. (f) To which family does D-41 belong ? (g) Name three floral characteristic of the specimen which places it the family mentioned in (f). (h) Write the botanical names of two plants belonging to the said family. ------------------------------------------------------------------------------------------------------------------------------37 ISC Specimen Question Paper

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