IGNOU BBYCT-131 December 2022 Previous Year Question Paper

Q1.(a) State whether the following statements are ‘True’ or ‘False’ : 4x1=4

(0) Retroviruses are RNA viruses that have reverse transcriptase.

(i) Chamydomonas is a unicellular non- motile alga.

(iii) Chilgoza seeds are obtained from Pinus gerardiana.

(iv) The capsule of Funaria is spherical and straight.

(b) Chose the correct option from those given in the parentheses : 4x1=4 @) Winogradsky worked on the bacterium (Sulfur bacteria/Bacillus anthracis) to study the symbiotic nitrogen fixation process. Gi) Funaria is (monoecious/dioecious).

(ii) The protostelic organisation is more (primitive/advanced) than a siphonostele.

(iv) Dolipore septum is observed in the mycelia of fungi belonging to (Ascomycota/Basidiomycota)

(c) Match the items given under Column ‘A’ with those given under Column ‘B’ : 4xi=2 Column ‘A’ Column ‘B’

(a) Sphagnum @ Ginkgo

(b) Colonial

(ii) Oedogonium

(c) Filamentous

(11) Volvox

(d) Living fossil

(iv) Peat formation

Q2.Differentiate between the following pairs of terms : 4225-10 Gi) Long shoot and dwarf shoot of pinus

(ii) Lysogenic and lytic cycle of bacteriophages

(1) Flagella and Pili

(iv) Gymnosperms and angiosperms

Q3.Define the transformation. How Griffith’s experiment was carried out to discover bacterial transformation ?

Q4.(a) Explain the role of bryophytes in prevention of soil erosion/and as pioneers of vegetation. 5

(b) Enumerate the unifying characteristics of archegoniates.

Q5.(a) How do pollination and fertilisation occur in Pinus ? Explain. 5

(b) Discuss the biological significance of heterospory.

Q6.(a) With the help of labelled diagrams, describe the sexual reproduction in Oedogonium. 5

(b) Describe typical life cycle of homosporous pteridophyte.

Q7.Write short notes on any two of the following : 5x2=10 @)_ Biofertilizer

(1) Polyembryony in gymnosperms

(ii) Alternation of generations

(iv) Coralloid roots of Cycas 4x2!=

(10)