W.B.C.S. (EXECUTIVE) EXAMINATTON - 2017
Botany : PAPER - I
Time Allowed: 3 Hours Full Marks: 200
GROUP- A : Answer any four of the following questions
1. Write brief notes on any four of the following :- 10 x 4
(a) Endemism.
(b) Virioids.
(c) Lichens.
(d) Mycorthiza.
(e) Plasmids.
(f) Phyto remedietion.
2. Distinguish between any four of the following : 10 x 4
(a) Endemic and epidemic diseases,
(b) Flagella and piili.
(c) Plesiomorphy and apomorphy.
(d) Apospory and apogamy.
(e) Habitet and niche,
(f) Disease triangle and disease cycle.
3. Explain any four of the following : 10 x 4
(a) Korpei-Kappe theory of root apex,
(b) Development of endosperm in angiospeims.
(c) Conservation of bicdiversrity.
(d) Distinguishing features of Archaea and Bacteria,
(e) Ovule types of angiosperms.
(f) Colonisation and rise of early land Plants.
4. Comment on any four of the following : 10 x 4
(a) Metallophytes.
(b) Endospore.
(c) Alpha-and omega taxonomy,
(d) Hyphal forma in fungi,
(e) Evolution of stelar types,
(f) Biofertillizer.
5. Discuss any four of the following : 10 x 4
(a) Disease cycle in late Blight of Potato,
(b) Evolution of sporophytes in Bryophytes.
(c) Structural features of Lyginopteris.
(d) Micro sporogenesis and microgametogenesis.
(e) Ecological succesion.
(f) ontogeny of trachea.
Group-B : Answer any two questions
6. (a) Describe the role of Bryophytes in plant succession. 10
(b) Write in brief about the origin of alternation of generations in Bryophytes. 10
7. (a) Describe geological time scale with dominant Plant groups through ages. 10
(b) Describe evolutionary significance of fossil pteridophytes. 10
8. (a) Describe the ultrastructure and chemical composition of plant cell wall. 10
(b) When does anomalous secondary grouth occur in some dicot stem ? Describe the structural anomalies in secondary qrowth observed in Boerhaavia stem. 10