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ISC Board Exam 2014 : Biology Paper 2 (Practical) with Model Answers

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi

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BIOLOGY PAPER 2 (PRACTICAL) Question 1 [5] (a) You are provided with two flower specimens D-41 and D-42. Describe the floral characteristics of each in semi-technical terms. (The details of individual whorls are not required.) (b) With a sharp razor blade, cut a longitudinal section of flower specimen D-41. Place one of the cut surfaces on a moist filter paper. Show it to the Visiting Examiner. Draw a neat and labelled diagram of the cut surface. (c) Cut a longitudinal section of flower specimen D-42 with a sharp razor blade. Arrange one cut surface on a moist filter paper and draw a neat and labelled diagram of this cut surface. (d) Observe the cut surfaces of the flower specimens D-41 and D-42 with the hand-lens provided and record your observations of the following features in a tabular form as follows: D-41 (i) D-42 Corolla Shape (ii) Androecium: (1) Relation of stamens to each other (2) Relation of stamens to petals Gynoecium (1) Number of locule(s) (2) Type of placentation (e) Take a fresh specimen D-42. Isolate its pistil. Cut a transverse section of its ovary. Draw a neat labelled diagram of the transverse section. (f) Name the families to which each specimen D-41 and D-42 respectively belong. (g) Write two characteristic features of each family you have mentioned in (f) above. (h) Draw a floral diagram of specimen D-42. (i) Write the floral formulae of D-41 and D-42. (j) Mention the botanical name of one economically important plant belonging to each family that you have named in (f) above. 91

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Additional Info : ISC 2014 : Board Model Answers (Biology Paper 2)
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