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ISC Class XII Board Specimen 2018 : 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) (Maximum Marks: 30) (Time allowed: 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 [ ] Note: Q4 (Spotting) is to be attempted on a separate continuation sheet. The continuation sheet is to be handed over to the Supervising Examiner after the last observation. This continuation sheet should be attached to the main answer booklet of the candidate after the examination. ------------------------------------------------------------------------------------------------------------------------------Question 1 [5] (a) Examine carefully the flower specimen D-41 provided. Describe the floral characteristics in semi-technical terms. (Details of individual whorls are not required.) (b) Cut a longitudinal section of one flower of specimen D-41 with a sharp razor blade. Place one of the cut surfaces on a moist filter paper so that all the parts are clearly visible. Draw a neat labelled diagram of the cut surface. (c) With the hand lens provided, carefully observe the cut surface of D-41. Record your observations in the table given below. (d) (i) Relation of stamens to each other (ii) Shape of the anther Take a fresh specimen of D-41. Using fine forceps, gently pull off and discard the sepals, petals and anthers of the floral specimen. Isolate its pistil. Show it to the Visiting Examiner Draw a well labelled diagram of the isolated pistil. (e) Cut a transverse section of the ovary. Observe it with a hand lens and draw a neat labelled diagram of the transverse section of ovary. ------------------------------------------------------------------------------------------------------------------------------ Copyright reserved. SPECIMEN QUESTION PAPER ISC 2018

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