IAS Main Botany Question Paper II- 2010

BOTANY

Paper-II

Time Allowed: Three Hours

Maximum Marks: 300

INSTRUCTIONS

Each question is printed both in Hind and in English.

Answer must be written in the medium specified in the Admission Certificate issued to you, which must be stated clearly on the cover of the answer-book in the space provided for the answers written in a medium other than that specified in the Admission Certificate.Candidates should attempt Questions no.1 and 5 which are remaining question selecting at least one question from each Section.

The number of marks carried by each question is indicated at the end of the question.

Provide diagrams in the answer books, wherever diagram in the answer books, wherever necessary.

SECTION

1. Explain any FOUR on the following in about 150 words each:- 15×4=60

Signal transduction in Prokaryotes

Spontaneous mutations

RFLPs

Origin of mitochondria

Normal distribution.

2. Explain FISH technique and its importance in understanding genomic relationships among species. 30

Distinguish between:

Smooth and rough ER 10

Ribosomes and Peroxisomes 10

Membrance proteins in ion tranport. 10

3. Diffrentiate between:

Negative and positive gene regulation. 15

Homologous and Heterologous recombinations. 15

Exons and Introns. 15

Transition and Transversion. 15

4. Describe in detail the Agrobacterium-mediated gene transfers in the development of transgenic crop plants. 30

Describe the method of developming maize hybrids. 30

SECTION- B

5. Explain any FOUR of the following in about 150 words each:- 15×4=60

Secondary metabolites and plant protection

Photolysis of water

Calcium in Plant growth

CDM

Progressive ecological efficiency.

6. How would you distinguish between enzymes and co-enzymes 15

Differentiate between climacteric and non-climacteric fruits. 15

Explain the process of fruit ripening and its regulation. 30

7. Explain photo-receptors and their role in regulation of plant growth. 30

There are exceptions to the ecological pyramids. Explain. 15

Explain the role of surface run-off in nutrient budget of ecosystems. 15

8. Mention the attributes of a species to make it invasive. 15

Describe the role of growth regulators in sex expression of plants.

Mention the 'hot spots' of India, and the reasons to recognise them as hot spots. 15

'Feedback loops' are the regulatory mechanisms that determine whatever changes take place in the ecosystem. Explain. 15