Code -03
BOTANY
Time: 3 Hours

Maximum Marks: ISO Note: Attempt Five questions in all. All question carry equal marks. Question Noo 1 is compulsory. Answer Two question from Part-I and Two question from Part-II. The parts of the same question must be answered together and must not be interposed
between answers to other questions.
1. Write short notes on any four of the f()llowing x 7.5=30)

Economic importance of algae.


Heterosis in plants


Vernalisation


Role ofparasexual hybridisation in plant breeding


Heterospory and Seed habit in Selaginella.


Chi square test in plant Crossings


PART-I 2 .(a)What is bacteriophage? Discuss Lysogenic life cycle of a typical Bacteriophage.

What is biological nitrogen -fixation. Discuss the role of nitrogen -fixers in the economy of nitrogen in nature.


What is alternation of generation? Discuss the role of this in the life cycle of Pteris.


What is Black stem Rust of wheat Discuss the process of infection of the causal organism and its life cycle.

What is anomalous §econdary growth in plants? Discuss the same in Dracaena.


Illustrate the mature sporophyte ofMoss. Distinguish between spores and elaters.


Explain Flora and Vegetation. Give brief account of Botanical Provinces of India.
Discuss briefly the merits and demerits of Bentham Hooker's system of Classification.
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P.T.O
What is a Vims Discuss infection, replication and spread and control ofTMY.

PART -II
Discuss the phenomenon of Gene Interaction with reference to Complementary and Epistatic genes.

How does Operon regulate the process of enzyme synthesis in Prokaryota?


What is mutation? Explain Spontaneous and induced mutations, and their role in plant breeding.


What is C4 Cycle? Differentiate it from C3Cycle. Correlate these to the stmctural features ofplants.

Distinguish between Oxidative and photophospho-rylation. Which is more efficient?


Define Totipotency. Discuss the role of plant growth hormones in plant growth and development.


Define Biodiversity. Describe 'Hot Spots' of World
Biodiversity.


What is 'Green House Effect'? Discuss the role of green house gases in human environment.


Explain the Term 'Central dogma of Molecular Biology.' Briefly describe the process of transcription and translation.



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