Diversity in Life forms I — DU B.Sc. (Hons) Biological Sciences Previous Year Question Papers

Instructions to Candidates : This paper contains 6 questions. Answer only four questions. : " 34. All parts of the question should be answered together. Attempt each new question on a fresh page. 1. (a) Define the following (any 4) : 1×4=4 (b) "Fill in the blanks: 1x4=4 (i) Common name of Selaginella is (i) The main pigment in red algae is pr " will te (iii) .... is present in molluscs for feeding. st (iv) type of cells are present in cnidarians for defense. (c) Match the following : *1x4-4 . (1) Nostoc (a) Lichens (1) Symbiosis (b) Heterocyst (d) Differentiate between the following : 1.5×2=3 (1) Male & Female Ascaris (i) Polyp & Medusae. (a) With the help of labelled diagrams explain the development of male "and female gametophytes in Selaginella. " Ik 7.5 (b) Give a detailed account of life cycle of pork tapeworm. 7.5 3. °(a) With the help of suitable diagram illustrate the water vascular system in asteroidea. (b) Write short notes on the following (any 3) 3×2.5=7.5 (i) Vesicular Arbuscular Mycorrhiza (VAM) (it) Economic importance of Lichens 2.5 (iịi) Female sex organ of Polysiphonia de tr : 2.5 (iv) Vegetative structure of Rhizopus 2.5 (a) Discuss key factors responsible for the biodiversity crisis/loss. 3.5 (b) Describé the thallus structure and reproduction in Nostoc. : 4 (c) Discuss the process of pearl formation in molluses with the help of suitable diagrams. • • (7.5) (a) Give an illustrative account of the sporophyte of Marchantia. 7.5 (b) Give a detailed description of the five kingdom classification given by R.H. Whittaker. 6. Discuss the following (any three): (5x3=15) (*). Structure of gemma cup of Marchantia (i) Canal. system in Sycon (iil): Alteration of generation in: Ectocarpus (iv) Sol gel Theory.