2020
BOTANY — HONOURS
Paper: CC-5
Full Marks: 50
The figures in the margin indicate full marks.
Candidates are required to give their answers in their own words
as far as practicable.
- Answer any five of the following :
(a) Which rock type is most suitable for preservation of fossils? Why? 1+1
(b) What are chemical fossils? Give an example. 1+1
(c) Which geological period is called the ‘Age of Ferns’? Why? 1+1
(d) State the chemical nature of sporopollenin. 2
(e) Mention the reasons behind Edward’s renaming of Rhynia major. 2
(f) What is hydrasperman reproduction? 2
(g) Distinguish between spores and pollen grains. 2
(h) Name the form genera of the root and leaf of Lepidodendron. 2 - Answer any two of the following :
(a) Write a short note on the principle of radiometric dating of rocks / fossils. 5
(b) Comment on the gametophyte of Rhynia. 5
(c) What is Aeropalynology? Write a brief note on the role of Aeropalynology on human health. 1+4 - Answer any three of the following :
(a) Give an outline of the three-fold subdivisions of Indian Gondwana. Mention at least five
characteristic megafossil genera from the respective subdivisions. 2½+7½
(b) Describe the modes of cellular permineralisation and authigenic preservation of fossils mentioning
one example from each type. 4+4+2
(c) Characterise the stem anatomy and fructifications of the reconstructed plant Calamites with suitable
illustrations. 4+6
(d) State the geological age of the reconstructed plant Cordaites. Describe its leaf anatomy and female
fructifications with labelled sketches. 1+4+5
(e) Give an account of sporoderm stratification as proposed by Erdtman and Faegri with labelled
sketches. Draw the different exine ornamentation patterns found in spores and pollen grains.
5+5
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