JUNE – 2021
B. Sc. (II Semester) Examination
BOTANY
Paper: BOT-121
(Phanerogams and Palaeobotany)
Full Marks : 50
Pass Marks : 35%
Time : Two Hours
Note: (i) Answer all the questions.
(ii) The figures in the margin indicate full marks for the questions.
1. Give brief accounts of any five of the followings: 2x5= 10
(a) LS circinotropous ovule
(b) Microspore of pinus
(c) Trace fossils
(d) Cladodes
(e) Ornithophily and Chiropterophily
(f) Autogamy and Geitonogamy
(g) Intrafascicular cambium and Biocolatoral vascular bundle
2. Answer any four of the following: 5x4= 20
(a) Give one example each of modified stem, leaf, root, flower and fruit
(b) Explain the process of endosperm formation in gymnosperms
(c) Describe the fossil Lyginopteris
(d) Explain the secondary growth in Nyctanthes
(e) Describe the stem anatomy in Gnetum
(f) Explain the process of triple fusion
3. Answer any two of the following:10x2= 20
(a) Explain the systems of classification in plants
(b) Explain the secondary growth formation in dicotyledonous. Discuss the anomalous growth in
dicotyledonous stem using suitable example with labeled diagram.
(c) Compare the male gametophytes of Cycas, Pinus and Gnetum.
(d) Describe the primary structure of monocote and dicote roots. Explain with suitable diagram, the secondary growth in dicot roots.
