The Union Public Service Commission (UPSC) holds the Civil Services Examination every year in two parts, i.e. Preliminary Test and Main Examination; the Main Examination comprises a written Test and a Personality Test. The Question paper of the IAS Main Botany Paper II –2010 is given as below:
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 -A
1. Explain any FOUR on the following in about 150 words each:- 15×4=60
(a) Signal transduction in Prokaryotes
(b) Spontaneous mutations
(c) RFLPs
(d) Origin of mitochondria
(e) Normal distribution.
2. (a) Explain FISH technique and its importance in understanding genomic relationships among species. 30
(b) Distinguish between:
(i) Smooth and rough ER 10
(ii) Ribosomes and Peroxisomes 10
(iii) Membrance proteins in ion tranport. 10
3. Diffrentiate between:
(a) Negative and positive gene regulation. 15
(b) Homologous and Heterologous recombinations. 15
(c) Exons and Introns. 15
(d) Transition and Transversion. 15
4. (a) Describe in detail the Agrobacterium-mediated gene transfers in the development of transgenic crop plants. 30
(b) 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
(a) Secondary metabolites and plant protection
(b) Photolysis of water
(c) Calcium in Plant growth
(d) CDM
(e) Progressive ecological efficiency.
6. (a) How would you distinguish between enzymes and co-enzymes ? 15
(b) Differentiate between climacteric and non-climacteric fruits. 15
(c) Explain the process of fruit ripening and its regulation. 30
7. (a) Explain photo-receptors and their role in regulation of plant growth. 30
(b) There are exceptions to the ecological pyramids. Explain. 15
(c) Explain the role of surface run-off in nutrient budget of ecosystems. 15
8. (a) Mention the attributes of a species to make it invasive. 15
(b) Describe the role of growth regulators in sex expression of plants.
(c) Mention the 'hot spots' of India, and the reasons to recognise them as hot spots. 15
(d) 'Feedback loops' are the regulatory mechanisms that determine whatever changes take place in the ecosystem. Explain. 15
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