C. S. E-Mains 2006: Botany
Paper-I
Section A

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

What is bioremediation?

Briefly discuss the phyletic position of photobionts.

Highligh the uniqueness of the cell structure of Anthoceros.

What is polarity and how does it affect differentiation?

How do the following differ from each other: (20 × 3 60)

Hybrid from Cybrid

Cryptogams from Archegoniates

Sporophyte from Gametophyte (in lower organisms)

Describe the following: (20 × 3 60)

Molecular basis of infection

Practical application of ovule culture

Microbes as indicators of pollution

Draw neat and well-labelled diagrams to show: (20 × 3 60)

Lytic cycle

Diagnostic stages of any two powdery mildews

L S sporocarp of Marsilea

Section B

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

What are the symptoms and causes of hay fever?

Describe the morphological nature of commercial cotton, clove and saffron.

Describe the phyletic position of Magnoliaceae.

Citing suitable examples explain what is meant by ‘form genus’

With the help of suitable diagrams explain: (30 × 2 60)

Development of a bisporic embryo sac

Vavilovian centres of origin of crop plants

Discuss the following:

Alpha and Omega taxonomy

Ethnobotany and its importance

Nemec phenomenon

Describe the following: (20 × 3 60)

Distribution in India of the genus yielding “Taxol”

Phenomenon of apomixis and its importance

Commonalities and differences between Cyeadofilicales and Cyeads