BOTANY

Paper II
Time Allowed Three Hours 300 I
INSTRUCTIONS

Each question is printed both· in Hindi and in English. Answers must be written in the medium. specified in Admissiqn Certificate . issued to YQU,. 'which be stated clearlY. on the cover of tfle answer-book in the space· provided for the purpose. No. marks wi.ll be given for the answers. writtelJ, in a medium other than that specified in· ihe Admission .Certificate. should attempt. Questions. and whic.h are and any three ofthe remaining questions selecting at least one question (rom each Sec#on.' . 'The number of "marks carried by each question is indicated at of th:e
qut?stlon. . Answers should blfpreci§e and to .the' point. Provide diagrams the answer-booft, wherever necessary.


SECTION A
1. What strategies are, employed by plants for the uptake of iron under conditions of iron stress
Describe about the factors that affect the recombination frequencies.
Explain antisense RNA technology with an example. Highlight its applications.
Explain the ecological significance offorests. "
15x4=60

2. Discuss the mechanism oCT-DNA transfer from Agrobacterium to host plant.
Explain the concept of limiting factor in ecology.
How can you iden.tify the multigene families? Discuss the significance of identical or non-identicalgeries ofmultigene familjes.
Present the current model for long distance transport of floral stimulus. 15x4=.60

Comment on and Tra genes.
Explain the Theory of Age and Area.
Discuss Jhemechanism of the regulation of gene activity in lactose operon 'with­ reference to beta galactosidase activity.
What evidences support hypothesis for,'gravitropism 15x4=60

4. Describe different methods of gene transfer In plants.
Distinguish petween monoploid and haploId and their'role in evolution.
Exp'ain salient features of The Environment Protection Act" and' mention. how far it is effective" in maintenance of the quality of environment.
What is the chemical nature of'saponins How do saponins provide defence aga:inst fungal attack on plants 15x4=60

SECTION B

5. Explain interspecific and intergeneric hybridization. Comment on Raphano-brassica.
What is eutrophication? What are its impacts on the ecosystem
Explain how the chromatin modification leads to genome.expression.
Schematically present ethylene in plants. Describe/illustrate the 'triple response' due to ethylene. 15x4=60

6. Explain the quantitative characteristics of a plant community.
Highlight the biosafety aspects arising out ofplant genetic engineering.
What IS RNA splicing Describe the known mechanism of RNA splicing for group-II introns.
What IS an osmosensor How does a two-component sensing/signalling system contribute to osmosensing 15x4=60

7. What is 'Satpura hypothesis' How does it explain discontinuous distribution of certain species
Explain the current developments in transgenic technology contributing to crop improvement.
How can you prove that DNA is a genetic material? Describe with suitable example.
What are the major functions of cytoskeleton in
Iiving cells 15x4=60

8. Give the basis of classification of Indian forests and give its outline.
How will you identify the expression of a cloned gene?
Describe briefly, how RNA molecule transports within the eukaryotic cell.
Compare the pattern of CO2 and ethylene production in a climacteric fruit. 15x4=60

Note: English version of the Instructions is printed, on the front cover o[this question paper.