(Download) CS (MAIN) EXAM:2020 BOTANY (Paper I)

• Exam Name: CS (MAIN) EXAM:2020 BOTANY (Paper I)

• Marks: 250

• Time Allowed : Three Hours

SECTION ‘A’

Q1. Write short notes on/Answer the following: 

(a) Applications of probes in Southern blotting.

(b) Nuclear pore complex and its functions.

(c) Structure and behaviour of B-chromosomes.

(d) Why are overlapping genes important ? Discuss.

(e) Describe Chi-square test and its applications in genetic study. 5+5=10 

Q2. (a) Discuss major steps in signal transduction.

(b) Describe the significance and uses of the following: 

(i) Male sterility 

(ii) Polyploidy in plant breeding

(c) Transgenic technology is a breakthrough innovation. Justify with examples. 

Q3.(a) Briefly describe two theories of Chiasma formation. Discuss whether Chiasmata are the cause or consequence of crossing-over. 

(b) What is Antisense RNA ? Explain its applications and describe the catalytic activity of RNA. 

(c) Does Z-DNA play a regulatory role ? Discuss critically. 

Q4.(a)  Explain the mode of biogenesis of peroxisomes and discuss their functions. 
(b) Name the phyto-geographical regions of India. Which are the dominant flora of the region representing the west coast of India from Kanyakumari to Satpura ranges in Gujarat ? 
(c) "Cell cycle is an ordered series of events leading to cell replication." Discuss. 

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SECTION 'B'

Q5. Write short notes on/Answer the following : 

(a) Climacteric fruits and their advantage to fruit growers. 

(b) Metabolic energy requirement for uptake of sucrose in apoplastic pathway. 

(c) Cyanide-resistant respiration in plants. 

(d) Can Intellectual Property Rights protect and safeguard farmers' rights and interests ? 

(e) What are the causes of the rise in mean atmospheric temperature and how will it influence the climate of a region ? 

Q6.(a) Carboxylation and oxygenation compete to decrease the efficiency of photosynthesis. Discuss. 

(b) What is drought escape ? Discuss different strategies adopted by plants for drought resistance. 

(c) What is Clock hypothesis ? Justify the importance of main photoreceptor and photoperiodic induction in photoperiodism. 

Q7.(a) How can the two laws of thermodynamics be combined to determine spontaneity of a reaction ? Also derive a relationship between free energy exchange and equilibrium constant. 

(b) What is bioremediation ? How can plants be used to detoxify the heavy metal containing industrial effluents ? 

(c) What is the importance of fatty acid synthase complex ? Discuss the growth of fatty acyl chain through priming and elongation phases. 5+15=20 

Q8.(a) How is solar energy trapped, fixed and transformed in an aquatic food chain ? 

(b) How do microbes help in chemical recycling in nature for a stable community climax ?

(c) Eco-development sequence proceeds from a barren land to a climax and finally ends in a desert. Explain critically. 

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