IGNOU BBYCT-131 June 2023 Previous Year Question Paper

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

(6) Louis Pasteur developed the vaccine from an attenuated culture of virulent bacteria. Gi) Heterocysts are present in Volvox.

(iii) Equisetum is heterosporous.

(iv) Ginkgo seeds have a foul odour.

(b) Choose the correct option from given in the parentheses : 4x1=4 @) (Gene therapy/Bacteriophage therapy) is a therapy in which viruses are used to destroy bacterial pathogens. Gi) The (coralloid/aerial) roots are apogeotropic and help in_ fixing Nitrogen. Gii) In (siphonostele/haplostele) there is no pith in the centre of xylem core.

(iv) Secondary mycelia in Basidiomycota are (monokaryotic/dikaryotic).

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

(A) Cup-like @ Rhizoids chloroplasts

(B) Fungalcell

(i) Trabeculae wall

(C) Marchantia

(iii) Chitin

(D) Selaginella

(iv) Chlamydomonas [3] BBYCT1

(31)

Q2.Differentiate between the following pairs of terms : 4x23=10 G) Bacterial cell and Archaeal cell

(ii) Liverworts and Mosses Gii) Transformation and Transduction

(iv) Petrifaction and Compression

Q3.Using a well-labelled diagram, show how the coralloid root of Cycas is structured. Discuss its benefits.

Q4.(a) With the help of diagrams, describe the sexual reproduction in Polysiphonia. 5

(b) Write the various uses of Gymnosperms under the following headings : 5 food, medicine, pulp and paper

Q5.(a) Why is it thought that gymnosperm seed have remarkable combination of two generations ? Explain. 5

(b) Using the labelled diagram, explain the structure of the Ts bacteriophage.

Q6.(a) Discuss the characteristics of haplostele and actinostele. 5

(b) Explain homologous theory of alternation of generations in brief.

Q7.Write short notes on any two of the following : 5x2=10 @ Bacterial plasmid

(1) Prokaryotic algal cell

(iii) Rhynia

(iv) Role of bryophytes in soil erosion ‘ae’: 4x1=4 4x2!=

(10)