Microbial World and Plant Diversity — DU B.Sc. (Prog.) Applied Life Sciences with Agrochemicals and Pest Management pertaining to Botany Previous Year Question Papers

S eme ster I i. The two prokaryotic kingdoms in the six-kingdom system are The small circular DNA present in bacteria apart from the main chromosome is called a iii. iv. v. vi. In the lytic cycle, the host cell after releasing newly formed phages. j4grrz.car produces spores on radiating plates called The sexual reproduction in bryopfiytes is always an advance ........................ type. The cells of po/ysz.p¢oJ7z.cz are interconnected by cormections. (b) Define the following (¢#j;fvc): (iii) Gemma cup (iv) Plakea stage (vi) Foliage leaves (c) Indicate whether the following statements are true of false (any five): (5x1=5) (i) Gymnosperms produce seeds that are enclosed within a fruit. (ii) Natural system of classification considers a wide range of morphological and anatomical characters. (iii) Bryophytes are more advanced than pteridophytes in evolutionary terms. (iv) Penicillium plays an important role in food spoilage and antibiotic production. (v) Lee's classification is based solely on the morphology of algae without considering evolutionary features. (vi) Archaebacteria are known to thrive in extreme environments. Q.2 Differentiate between the following (any three): (3x5=15) (i) Haplontic and Diplobiontic alternation of generations (ii) Generalized and specialized Transduction. (iii) • Smooth walled and tuberculated rhizoids. (iv) Male cone and Female cone of Pinus Q3. Write short notes on the following (any three): (3×5=15) Artificial system of angiosperm classification and its limitations. (ii) Evolutionary trends observed in bryophytes. (iii) Darwin theory of Evolution (iv) L- form of bacteria. Q4. Draw well labelled diagram of the following (any three): (5x3=15) (i) Structure of TMV (I1) T.S. needle of Pinus (iv) Internal structure of Marchantia thallus Q5. (a) What are the different ways by which bacteria can transfer genetic material and briefly describe any one of those processes. (5) (b) Describe the asexual reproduction in Volvox. (5) (c) What are the affinities between gymnosperms and pteridophytes? (5)