(Download) CS (MAIN) EXAM:2020 BOTANY (Paper I)
Exam Name: CS (MAIN) EXAM:2020 BOTANY (Paper I)
Time Allowed : Three Hours
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.
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.