IGNOU BBYCT-131 December 2024 Previous Year Question Paper

Q1.(a) State whether the following statements are true or false : 4x1=4 G) Amphigastria are present in Junger- manniales. Gi) Liverworts are used for stuffing beddings. Gii) Stele in Rhynia is siphonostele.

(iv) Stomata in Equisetum are sunken.

(b) Choose the correct options from those given in the parentheses : 4x1=4 @ Arbuscles are formed in (ecto/endo)- mycorrhiza.

(i) (Ascomycetes/Deuteromycetes) are the fungi that only reproduce asexually.

(iii) Illness due to ingesting of toxic fungal metabolites formed in the food due to fungi are called (Mycosis/Toxicosis).

(iv) The economically important red algae in India include (Gracilarial Spirulina).

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

(A) Stem has nodes @) Fronds and internodes

(B) Large megaphylls

(ii) Welwitschia

(C) Only two leaves ii) Tap are formed

(D) Primary root

(iv) Equisetum system

Q2.Differentiate between the following points of terms : 4x2'%=10 @) Bryophyta and Pteridophyta

(i) Monoxylic and Pycnoxylic wood

(iii) Male cone and female cone of Pinus

(iv) Transformation and Transduction in bacteria

Q3.Bryophytes are widely used by people in the cold temperature regions in their day to day lives. Give a detailed account of the economic use of bryophytes with examples.

Q4.(a) Describe the major phases of the life cycle of Polysiphonia. 5

(b) Enumerate the characteristics of Lycophyta.

Q5.(a) Describe mycorrhiza. How does it help the host ? 5

(b) Describe the normal and coralloid roots of Cycas. Illustrate with diagrams.

Q6.(a) Explain the mechanisms of pollination and fertilization in gymnosperms. 5

(b) Define heterospory. Explain its biological significance.

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

(ii) Genetic recombination in bacteria Gii) Phycocolloids

(iv) Fungal diseases in animals and humans

Q8.wee (aide) = (sta :/aral) 4०26-10

(ii) WET HR AN ARI WH