IGNOU BBYCT-135 June 2025 Previous Year Question Paper

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

(0) Bulliform cells are present in abaxial epidermis of grass leaves. di) All tropical tree exhibit a continuous cambial activity.

(iii) Rhizodermis plays an important role in nutrient uptake by the plant roots.

(iv) Most apomicts produce a degenerate or complete embryo sac.

(b) Fillin the blanks : 4x1=4

(i) In fruits, seeds are attached to a fruit wall by a stalk known AS eect *

(ii) cells form the entire embryo.

(iii) The cell having thick lignified walls

(iv) Young leaf primordium arises as a small protuberance in

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

(A) Monocot stem G@) Leaves

(B) Dicot stem Gi) Phloem on either side of xylem

(C) Bicollateral Gii) Vascular bundles arranged in aring.

(D) Petiole

(iv) Protoxylem cavity

Q2.Differentiate between any two of the following : 2x5=10 G@) Stomatal Frequency and Stomatal Index

(1) Endosperm of gymnosperms and Endosperm of angiosperms

(ii) Pericycle and Endodermis

(iv) Syngamy and Triple fusion

Q3.What is end product of triple fusion ?

Q4.Explain its structure and function with labelled diagram.

Q5.(a) Discuss various theories of shoot apical organization with the help of a labelled diagram. 5

(b) Why are phloem and xylem considered as complex tissues ?

Q6.(a) Discuss fruit development in caryopsis and berry fruits. 5

(b) Explain the mechanism of salt removal by the mangroves.

Q7.(a) What are the differences between ectomycorrhiza and endomycorrhiza ? 5

(b) What is adventive polyembryony ? Discuss with suitable example.

Q8.Describe secondary growth in a typical dicotyledonous stem using properly labelled diagram.

Q9.Write short notes on any four of the following : 4x25 = 10 G@) Quiescent centre Gi) Succulent plant Gii) Nucellus

(iv) Aggregate fruit

(v) Parthenogenesis 4x1=4 2x5=10 4x22=

(10)