BACHELOR OF SCIENCE. (B.Sc.) Term-End Examination June, 2017 LIFE SCIENCE LSE-12 : PLANT DIVERSITY-I

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1 No. of Printed Pages : 8 I LSE-12 I C3 1. BACHELOR OF SCIENCE. (B.Sc.) Term-End Examination June, 2017 LIFE SCIENCE LSE-12 : PLANT DIVERSITY-I Time : 3 hours Maximum Marks : 75 Note : Answer the questions as directed in the Sections A, B and C. Draw neat and labelled diagrams wherever necessary. SECTION A Note : All the questions in this section are compulsory. 1. Fill in the blanks : (a) (b) (c) The epidermis of land plants is covered with to prevent evaporation and desiccation. The extensive prostrate as well as erect branching of the main filament is found in form of algae. The spindle shaped cells with spiral thickening in the capsule of Marchantia are called (d) In pteridophytes, is the innermost layer of the sporangium that providei nourishment to the developing spores. (e) The botanical name of Baker's Yeast is LSE-12 1 P.T.OI

2 2. Choose the correct alternatives from the given parentheses/fill in the blanks : 5 (a) Porphyra belongs to division. (Phaeophyta/Rhodophyta). (b) (c) Vegetative reproduction in Anthoceros takes place through (gemma cups/tubers). When the dikaryotic hyphal segment of Basidiomycetes takes the form of a hook and fuses with the adjacent segment it is called (d) Stellate ' plastids are present in (Zygnema/Ulothrix). (e) The earliest group of vascular plants known are (Trimerophytes/Rhyniophytes). 3. Match the structures listed in Column I with their respective groups given in Column II : 5 Column I Column II (i) Cephalodeum (A) Bryophytes (ii) Oidia (B) Lichen (iii) Leptoids (C) Pteridophytes (iv) Heterocyst (D) Fungi (v) Sporophyll (E) Cyanobacteria LSE-12 2

3 SECTION B Note : Answer any six questions. All questions carry equal marks. 4. Describe the life cycle of Chlamydomonas. 5. Giving a suitable example and with the help of a labelled diagram, describe the structure of conidiophore of a fungus. 6. Describe the morphology, and internal structure of leaf of Sphagnum. 5 What is the importance of mycorrhizal fungi? 8. With the help of a diagram, describe morphology of a plant of Equisetum Discuss the Endosymbiont theory Describe vegetative reproduction in lichens Write short notes on any two of the following : 2x2 1 2 =5 (i) Use of Algae as Biofertilizer (ii) (iii) (iv) Household uses of Bryophytes Algal-Animal Associations Diatoms 12. Discuss the evolution of structural complexity in the sporophyte of bryophytes. LSE-12 3 P.T.O.

4 SECTION C Note : Answer any three questions. All questions carry equal marks. 13. Discuss the salient points of Five Kingdom Classification. Give an example of each kingdom Illustrate the disease cycle of Puccinia graminis Explain alternation of generations in Pteridophytes/Bryophytes Discuss the biological significance of heterospory Give a comparative account of reproductive bodies of Selaginella and Pteris. 10 LSE-12 4

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