C. S. E-Mains 2001: Botany
Paper-I
Section A

Answer any three of the following in not more than 200 words each 20 × 3 60

Distinguish between bacteriophages and plasmids. Give their molecular structure. How are plasmids useful in genetic engineering?

Discuss the role of pigmentation and reserved food in the classification of algae.

How does a parasite recognize its host? Describe the molecular basis of host-parasite relationship.

Describe the structure and evolutionary significance of Rhynia.

Answer the following questions

Describe the mode of sexual reproduction in yeast.

Describe the role of microbes in medicine industry. 30 × 2 60

Discuss the evolutionary trends of saprophytes in Bryophytes. 60

What is heterotrichous habit in Algae? Discuss its role in the evolution of terrestrial habit. 60

Section B

Answer any three of the following in not more than 200 words each: 20 × 3 60

Jurassic was the best age of Gymnosperms. Discuss.

Describe the role of embryology in classification of angiosperms.

Describe the detailed structure of pollen wall. How has palynology helped in forensic science?

What are the primitive and advanced characters of flower used in driving their phylogeny?

What is double fertilization? In the light of recent studies discuss the mode of fertilization in angiosperms. 60

Answer the following questions

How are somatic hybrids obtained?

Ovule bearing organ of Pinus is a highly reduced shoot in the axil of bract. Discuss. 30 × 2 60

Give important flower characters of the following families. Give economics importance of three plants from each family. 15 × 4 60

Apiaceae

Rubiaceae

Arecaceae

Brassicaceae