LSE-12 BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, 2015 SECTION A

Transcription

1 No. of Printed Pages : 8 LSE-12 BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, LIFE SCIENCE LSE-12 : PLANT DIVERSITY-I Time : 3 hours Maximum Marks : 75 Note : Answer the questions as directed in 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 : 5 (a) The organisms that derive nutrition by engulfing and digesting other prokaryotes are known as (b) Coralline algae are a group of algae that secrete calcium carbonate around their cells and form stiff thalli. (c) In planogametic copulation in fungi there is a fusion of (d) The sexual reproduction in ascolichens is similar to that of (e) Rhynie chert deposits are thought to be of period. LSE-12 1 P.T.O.

2 2. Indicate whether the following statements are True or False : 5 (a) Blue-green algae are more closely related to the green algae rather than bacteria. (b) Most fungi prefer acidic medium for growth. (c) Ligules prevent shoot desiccation in Selaginella by conserving water. (d) Psilotum flaccidum is a rare plant and it occurs in Jamaica and Mexico. (e) The earliest seed-like structure is shown by the fossil Genomosperma kidstonii. 3. Match the items of Column A with the most appropriate items of Column B : 5 Column A Column B (i) Equisetum (a) Chlorophylls a and b (ii) Prochloron (b) Brown algae (iii) Cap cells (c) Nostoc (iv) Kelps (d) Oedogonium (v) Heterocysts (e) Vallecular canal LSE-12 2

3 SECTION B Note : Answer any six questions. All questions carry equal marks. 4. Explain the mechanism of evolution by endosymbiosis with the help of suitable diagrams Describe the most widely accepted classification of organisms. 6. Draw a well labelled diagram showing the ultrastructure of an Eukaryotic cell Describe the sexual reproduction in Rhizopus sp. with the help of well labelled diagrams Describe the salient features of sporophytic and gametophytic generations in Bryophytes Differentiate between the Eusporangiate and Leptosporangiate types of sporangial development in Pteridophytes Explain apogamy and apospory in Pteridophytes, giving suitable examples. 11. Describe the role of Bryophytes in the process of succession. 12. What are fossils? Explain the process of fossilisation. 2+3=5 LSE-12 3 P.T.O.

4 SECTION C Note : Attempt any three questions. All questions carry equal marks. 13. Comment on the evolution of sexual system in algae with the help of suitable examples and illustrations (a) Name the causal organism of Late Blight of Potato and give a detailed account of the symptoms and control measures of the disease =7 (b) Draw a well labelled diagram of the above disease cycle (a) Why are Bryophytes known as amphibians of the plant kingdom? 3 (b) Describe the various adaptations of Bryophytes to Land Habit Critically comment on the Telome theory with suitable illustrations Differentiate between any five of the following : 5x2=10 (i) Prokaryotic and Eukaryotic cells (ii) Chromatophores and Chloroplasts (iii) Heterocysts and Akinetes (iv) Pseudoparenchyma and Prosenchyma (v) Vessels and Tracheids (vi) Spores of Equisetum and Selaginella (vii) Filamentous and Heterotrichous forms of algae LSE-12 4

5 t-iinet) (*.KR At) Td ITNIT TR', 2015 Ala id i.-12 :1177 fedirer-1 ffsiel :3 Etu2 3TRIWUTI 31w: 75 wur ath- 77. #/ P- 7-7 wym- yr-4 3-dT ef ww FIW 72IT cl q-41f I nrgx *z: T &us Nv37-PaRiff / 1. it- P-ITAIII:Ottr7R: 5 5 P.T.O.

6 2. r 1-.1r tsid W?-R t 71T!frig, : 5 () 110 -eki crarktil 3AA1T >;fkd 1-4T-0,Tenqi Picbe..Fq -Erif.Ri-al I (v) 3. *t adcm w 7crg- Tr- fgro-r-47 : chtelq (i).,:/ifficat () civiozno t (ii).cdcte-dd-i (iii) 31l 9 ('illicn) a;$1,4,1(1. (Ti) -1/eLe/ch (iv) *- 1- (E0 iskrmg (v) LSE-12 6

7 INuNTif A7--e Ofwq mit N osim 4. 3iff: gm fa-*-rer *1 Alen 3q-gT1 iii leicil kv15ilw I 5. R-44 atrtr Trr4 7r4 aufq trr7r I 6. aii-orach *4,1 T4fiaT t-iihirno Pal est-ii* 7. Z7-$07-4T T r1-r *rr7r I le4 Lbw.. Al-A-rol-TOTq 21-r InT5T411-rpil*'t f erd-rff 5 9.?As 40e: 4 # "W*11:1* gt7tittatzl TONTEITIT414 uchil 4 ai-d-{ Tcru zj-.3qwut?Riittoe.1 319Tgrq atert-a-ruja-r *'r ceptseu *==t1-4r j-ilur 191-ō;rr 4 oiei tod. IL-W*1 au `1 SRI :f A;L:11 #? (10Prtir4q) o-isw I 2+3=5 LSE-12 7 P.T.O.

8 T 7)z : AT Av TR-4 3-d-? mit 3R-4i a Hy/../ g / Th z-4-r-guil TAT ri;i1 *ATA. A Aft NA-Fi fd P.,-quil*"rr-A V. I , rarirad 3-TTEITRI..114 fftf MTT i *1* c RT T l Air-Avr rnta dqteil ffarp Ṉam tf-4r I 1+2+4=7 al-rq,a1 rac,iff'sid airrgrrft*trr-w -4r-pI () 1:1F<E1 3IT ;Eff \Aim? 3 SIN 1-1)14d. A *.N1W qui-i I :Rj TfrKff trdigf RTZ:Iff ii: wftw-gr fuquit f-ar PHRiRgd A f A aft( Tcra *tr A.R : 5x2=10 (i) TAT a ecirach * *=t (#-41) (ii) 5111AaLblk (hi) PAR.R-d fq74e (iv) ckoricict) Mil. 414 d'cich (v) qrrgwrq T2ri (vi) kctc/i4eii.8.2tt t4ci/f314c-il #179 (vii) A-4TA.ff2TT rcitiliciqct) sichr LSE ,000