IGNOU BBYCT-135 December 2024 Previous Year Question Paper

Q1.(a) State whether the following statements are True or False : ; x4=2 @) A perforation plate is the contact area of two adjacent plates. Gi) Promeristem gives rise to primary meristem.

(ii) The outmost layer of the ground tissue of the root develops and differentiates as endodermis.

(iv) Trichoblasts are root hair initials.

(b) Fill in the blanks : 1x3=3 @)_ No free nuclear stage is seen in type of endosperm. Gi) Synergids play an important role in the entry of the in the embryo sac.

(ii) The pollination of the flowers assisted by snails is known as... -

(c) Define the following terms : 12555

(06) Pollen Kit Gi) Apospory

(ii) Barriers to fertilization

(iv) Endosperm with Chalazal Haustoria

(v) Commercial Cork

Q2.(a) Explain the Tunica-Corpus Theory. 5

(b) Describe Dicot and Monocot roots with diagram.

Q3.(a) Explain the economic importance of wood. 5

(b) Briefly explain the structure and function of different types of Trichomes.

Q4.(a) Explain the process of insect pollination. Describe the waggle dance of the bees and its importance. 5

(b) Describe the genetic regulation of embryo development.

Q5.Describe the various types of cambial variants in stem and roots with labelled diagram.

Q6.Differentiate between any two of the following : 5x2=10 @) Primary and secondary root Gi) Heteromorphic and Homomorphic incompatibility

(iii) Nuclear male sterility and Cytoplasmic male sterility

Q7.Write short notes on any four of the following : 2'2x4=10 @)_ Triple fusion Gi) Polygonum type embryo sac Gii) Polyembryony

(iv) Aril

(v) Lenticels [

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