Note : Answer the questions as directed in SECTION A, B and C. Draw neat labelled diagrams 'wherever necessary.
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1 No. of Printed Pages : 8 LSE-12 cv") BACHELOR OF SCIENCE (B.Sc.) Term-End Examination CD June, 2011 LIFE SCIENCE LSE-12 : PLANT DIVERSITY-I Time : 3 hours Maximum Marks : 75 Note : Answer the questions as directed in SECTION A, B and C. Draw neat labelled diagrams 'wherever necessary. SECTION - A Note : All the questions in tins section are compulsory. 1. Fill in the blanks : 5 (a) Cyanobacteria possess the pigment photosynthesis. that evolves oxygen during (b) Heterocvsts fix atmospheric - (c) (d) (e) Sexual stage of fungi is known as state. The sporangia of phatoplithora inftstans are shaped. A few cells of the ventral surface of Marchantia thall us are filled with LSE-12 1 P.T.O.
2 2. Match the fossil plant parts with the suffix used 5 for its naming : Fossil Plant Parts Suffix (a) Woody part (i) - pteris (b) Micro sporangium (ii) - carpon (c) Cone (iii) - theca (d) Fern - like (iv) - strobilus (e) Seed like structure (v) - xylon 3. Mention as to which of the following statements 5 are true and which are false? (a) (b) (c) (d) (e) Archaebacteria are prokaryotes and eubacteria are eukaryotes. Capsule of Anthoceros contains spores and true elaters. Uredospores produced by Piiccinia are dikaryotic. Sphagnum plays a key role in the formation of peat. Sporangia in Selaginella are of two types. LSE-12 2
3 SECTION - B Answer any six questions. All questions carry equal marks. 4. With the help of a neat and labelled diagram 3+2 describe the ultrastructure of algal chloroplast. 5. Diagrammatically represent the life cycle of 5 Ulotlirix. No description is required. 6. How many types of gametic fusion are found in 5 Fungi? Explain each in one or two lines. 7. Explain the importance of Lichens List the important structural and biochemical 5 characteristics common in algae and bryophytes. 9. If you are on a botanical tour how would you 5 identify Riccia, Marcliantia, Funaria and Equisetum with the help of a hand lens? 10. Illustrate and describe the internal structure of 5 rhizome of Marsilea. Mention its hydrophytic characters. 11. Describe the vegetative reproduction in any two 5 bryophytes. 12. Compare the morphological features of Psilotum, 5 Selaginella and Pteris. LSE-12 3 P.T.O.
4 SECTION - C Answer any three questions. All questions carry equal marks. 13. Describe the symptoms, pathogen and disease 10 cycle of loose smut of wheat. 14. Trace the evolutionary sequence of the sporophytes 10 in bryophytes with suitable examples. 15. Explain heterospory. Describe how it has led to 10 the evolution of seed habit in plants. 16. Differentiate between the following pairs : (a) Eusporangiate and leptosporangiate types 21/2 of Sporangial development. (b) Apogamy and apospory 21/2 (c) Heterocysts and akinetes 21/2 (d) Pseudoparenchyma and prosenchyma 21/2 17. Describe the Telome concept regarding the origin 10 and evolution of leaves in vascular plants. LSE-12 4
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7 : Ur: TR* 3-ff un' I 779# TR*i 3-fw foo-f 4. TIFF -ff211-11hirchcf ch -97-Rla-Tr#T T aui-t N-1c c.11q 5. A). TT 7r?/4ci h F-ic\FLId ART I -{:r* q71M7T t *-r-{ Tin=fT. -1 I0-1 (gametic fusion) 5 I f t? fi 1 -{41.1 I =11 4)1 '--11ci-41-1-f-A t7t-4 47 '411 TFIr',.TT 71-11c ,3) c1-) 1 ct;) Tk-91 q977 I 9. Tit 3Trcr 1,-rWcvi-) v-trilf ITT t,3114 s T ch.) 5 V-1c11 Prchi-IV, HicT)r-qtqt v/t4r77/7 of-) t74 04? ItLi Clq I Tir-q7.Tifff 5.W1f77 I,tol*Fclit 3c-c t oh I RI ch qurk Lit.c.i/d4i, vic,t/3-11-{ e7wcil 3-1TWTF1--A-4 faterd-ra 5 a-)") vi LSE-12 7 P.T.O.
8 (55-7 : ft77: / 777/*. drh ft we foul el 13. q:* ci 1tḡ (loose smut) t -9a-TuT,..) 4 1\ t10 r-l* 14. IVI-)N-)1*-fif t\l-r(gi 10 Tirtff I 15. cit1 4-1,s4 zilujdf T-ftq'f 10 ci-) f-q -rtr ( (71 (5c1-11=h ; : (a) 4) \31115-iff974is qt Trili I -I) 21/2 cilq zit T-Trtz - (b) 6-1LITHi.UPT1 21/2 (c) f971. :17 21/2 (d) 1)-1 21/ Z-t 71"q1:4 rrffzif m1 372if q94 if 10 -athate.qui9 FA LSE-12 8
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