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

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1 CI CI I LSE-12(S) I BACHELOR OF SCIENCE (B.Sc.) Term-End Examination No. of Printed Pages : 8 June, 2017 LIFE SCIENCE LSE-12(S) : PLANT DIVERSITY-I Time : 3 hours Maximum Marks : 7 Note : Answer the questions as directed in the Sections A, B and C. Draw neat and labelled diagrams wherever necessary. SECTION A Note : All questions in this section are compulsory. 1. Fill in the blanks : (a) (b) (c) The experimental evidence for origin of organic compounds from inorganic substances was demonstrated by Spirulina contains a high percentage of and is also rich in carotenes. In Pteris, an outgrowth which protects the sori is called (d) In Puccinia Graminis the are stalked bi-celled, spindle-shaped structures constricted at the septum. (e) The algae belonging to. Bacillariophyta are called LSE-12(S) 1 P.T.O.

2 2. Choose the correct. alternatives from the given parentheses : (a) (b) (c) (d) (e) The thallus of (Ulva I Fucus) is made of two layers of cells pressed to each other. A spore of bryophytes represents first stage of (sporophytic/gametophytic) generation. Heterospory is found in (Selaginella I Pteris). Rhizopus belongs to division (Myxomycota/ Zygomycota). Hotspots are the areas in the world which are (very hot throughout the year/rich in biodiversity). 3. Match the organisms given in Column I with their respective uses given in Column II : Column I Column II (a) Sphagnum (i) Production of methane (b) Cladonia (ii) Nori Rangifera (c) Porphyra (iii) Food for reindeer (d) Saccharomyces (iv) Absorbant Cerevisiae (e) Spirulina (v) Ethanol LSE-1 2(S)

3 SECTION B Note : Answer any six questions. All questions carry equal marks. 4. Why are slime moulds not considered as true fungi?. Compare the morphology of heterotrichous and polysiphonoia forms of algae. 6. Diagrammatically represent the formation of perithecium in Neurospora Crassa. 7. List the competitive advantages and challenges of terrestrial environment for plants. 8. Describe the morphology and internal structure of an extinct pteridophyte. 9. Describe reproductive bodies of Marsilea. 10. Write short notes on any two of the following : / / (a) Fungal Diseases in Humans (b) (c) (d) Industrial Applications of Algae Apospory Role of Bryophytes in Preventing Soil Erosion 11. Compare the organization of cells in prokaryotes with eukaryotes. 11. Describe the modes of asexual reproduction in algae. LSE-12(S) 3 P.T.O.

4 SECTION C Note : Answer any three questions. All questions carry equal marks. 13. Describe file disease cycle of Ustilago Tritici Discuss the similarities and dissimilarities in the features of algae, bryophytes and pteridophytes Describe sexual reproduction in Marchantia Discuss the stellar structure and evolution in pteridophytes Discuss the evolution of sporophytes in bryophytes with suitable examples. 10 LSE-12(S) 4

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