zoology Arena

Q:-1 Write short note on the following (200 words) 10X2 - 20 1) Status of sphenodon 2) Skull types in Reptiles Q:-2 Describe the origin of reptiles. Comment on the status of Crocodiles. (20) Q:-3 Discuss various theories of origin of life put forth prior to industrial era. Discuss their merits and demerits as well. (15) Q:-4 Describe modern theory of evolution in detail. briefly explain the chemical basis of origin of life.

Q:-1 Describe the evolution of Tetrapods. Give the classification of Amphibian with suitable examples. (20) Q:-2 Compare the paedomorphosis and neoteny. How neoteny played an role in human evolution. (15) Q:-3 Discuss the various strategies of parental care in amphibians. Explain its significance briefly. (20) Q:-4 What is split gene ? Discuss the origin of introns. Comment on 2R hypothesis. (15) Q:-5 What is imprinting? Describe how Igf2's imprinting operate in human. Discuss the role of small RNA molecules in regulating gene expressions. (20) Q:-6 Briefly explain Wobble hypothesis with examples. Enlist general features of genetic code with examples. (10)

Q:-1 What is dosage compensation? Explain lyonnhypothesis. Discuss its significance. (20) Q:-2 Discuss the sex determination process in Drosophila. How it is different from humans. (15) Q:-3 Describe the molecular mechanism of sex determination in human. Comment on evolution of Y chromosome in mammals. (20) Q:-4 What are anadromous fishes? How their migration process different from catadromous fishes. Describe the significance of migration. (20) Q:-5 Discuss the process of osmoregulation in pieces. Describe their respiration in brief. (15)

Q:-1 Explain the metamorphosis in Urochordata. Discuss its peculiar systematic position and affinity with invertebrates. (20) Q:-2 Give the affinity and characteristic features of Balanoglossus. (15) Q:-3 What is neurotransmitter? Explain is signalling mechanism. Describe various types of signalling molecules. (20) Q:-4 What is apoptosis? Describe the role of Bcl-2 family in apoptosis. How mitochondria is regulating process of apoptosis? (15+5) Q:-5 Discuss the implications of impaired signalling pathways. How biotechnology can play a role in it? Describe any one common congenital disorder due to impaired functioning of Signalling pathway. (20)

DAF for mains 2018 has been out click here to Go For instructions and general information                                click here

Q:-1 Describe the general characters of Phylum Echinodermata and classify the phylum upto subclasses. (20) Q:-2 What is repressor? Explain the trp operon and compare it with lac operon. (20) Q:-3 What is chromatin modification? How it is mediated? Discuss its role in gene regulation. (15) Q:-4 Describe the various larval forms in phylum Echinodermata. Explain their significance also. (20) Q:-5 What is water vascular system? Briefly explain the mechanism of respiration in Echinodermata. (15)