IGNOU BBYCT-135 December 2023 Previous Year Question Paper

Q1.(a) Fillin the blanks : 1x5=5

(i) The meristem lies between the regions of permanent tissues and considered as a part of the primary meristem. Gi) The cells adjacent to guard cells that are distinct in shape, size or cell contents are termed a8 00

(ii) When stamens are fused to form two groups, the condition is called

(iv) In wu... apomicts, one or more somatic cells of the ovule give rise to an unreduced embryo sac(s).

(v) A leaf without petiole is called

(b) Define the following terms : 1x5=

(5)

Q2.Xylary fibers

(i) Corpus Gii) Dendroclimatology

(iv) Dioecious

(v) Semigamy

Q3.(a) Describe the structure of vascular cambium. 5

(0) Differentiate between the internal structure of dicot and monocot stem.

Q4.(a) What are halophytes ? Explain their morphological and anatomical adaptations.

(b) Discuss the role of epidermis in plants.

Q5.List the various types of ovules and describe the structure of an ovule.

Q6.(a) Discuss advantages and disadvantages of self-pollination. 5

(b) Describe syngamy and double-fertilization.

Q7.(a) Define apomixis. Discuss its importance. 5

(b) Discuss various mechanisms evolved by plants for dispersal of its seeds.

Q8.Differentiate between any two of the following : 5x2=10

(i) Parenchyma and Sclerenchyma

(1) Adaptations in hydrophytes and adaptations in xerophytes Gii) Autogamy and Geitonogamy

Q9.Write short notes on any four of the following : 2224-10 @) Polyembryony

(ii) Organogenesis during flower formation

(11) Ray initials

(iv) Lateral meristems

(v) Pollen sterility

Q10.1. 0.

Q11.1. 0. 5x2=10