zoology Arena

Q:-1 Establish the phylogeny of modern horse by using fossil data. (15) Q:-2 Compare the features of Trilophodon and Stegodon. (10) Q:-3 Draw well labelled diagram of mammalian testis and ovary. Give their comparative account in mammals. (20) Q:-4 Give the functions of the following from given blank diagram after labelling. (10) a) 10 b) 13 c) 8 d) 6 Q:-5 Discuss the evolution of heart through its comparative account in various vertebrates. (20)

Q:-1 Write short notes on the following in 200 Words each 10X4-40 a) Scales in fishes b) Jaw suspensorium in vertebrates c) Endoskelton in fishes and amphibians d) Respiratory organs in amphibians and reptilians comparative account Q:-2 Discuss the evolution of heart with suitable diagrams and give detailed account of it in mammals. (20) Q:-3 What is hardy weinberg law? In a large experimental Drosophila population, the fitness of a recessive phenotype is calculated to be 0.90, and the mutation rate to the recessive allele is 5 × 10−5. If the population is allowed to come to equilibrium, what allelic frequencies can be predicted? (5+10) Q:-4 Discuss the origin of humans with suitable fossil descriptions. (20)

Q:-1 Discuss the origin of mammals and briefly explain adaptations of aquatic mammals. (20) Q:-2 Give the anatomical features of pituitary gland. Describe its secretions regulating other endocrine glands with feedback mechanism. (15) Q:-3 Compare the features monotremata and marsupials. How they are different from primates. (15) Q:-4 What is speciation? How natural selection operates? (10) Q:-5 Define isolation. Give various isolation mechanism and describe how they are contributing to speciation? (20) Q:-6 Compare the Batesian and Mullerian mimicry. Discuss evolutionary significance of mimicry. (20)

Retrogressive Metamorphosis in Urochordates Metamorphosis is a change from the juvenile to adult stage in which larval stage is quite different from the adult stage. In retrogressive metamorphosis the larva possesses advanced characters which are lost during the development and the adult is either sedentary or degenerated with primitive characters. Urochordate adults, being sedentary show degenerative characters while the free swimming tadpole larva shows advanced chordate characters which are lost during metamorphosis. Parasitic crustaceans, like Sacculina and copepod parasites and stylopids and scale insects (Insecta) also show retrogressive metamorphosis. Retrogressive Metamorphosis in Herdmania The tadpole larva of Herdmania is only 1-2 mm long when it hatches out of the egg. It does not feed and hence has only 3 hours of survival during which it has to swim about in search of a suitable substratum for attachment. The larva needs advanced features for its free swimming existence,...

Hemichordata status                           Introduction Hemichordata was till recently treated as the sub phylum of the phylum Chordate but is now regarded to be the independent phylum of invertebrates very close to the phylum Echinodermata. The peculiar characteristics of the animals belonging to Hemichordata are as follows, Enterocoelus coelom Pharyngeal gill slits Buccal diverticulum (earlier considered as notochord) Vermiform body divisible into three regions – proboscis, collar, trunk The phylum hemichordate includes a small group of soft, primitive and marine chordates called as acron worms or tongue worms. Most familiar genus of this phylum is Balanoglossus which belongs to the class Enteropneusta. Other closely related genera are Saccoglossus, Glossobalanus etc. The class Enteropneusta was established by Gegenbaur in 1870. Since then due to the peculiar anatomical organisation and embryology, Hemichordata have...

                             Week-3 Instructions:- There are Seven questions divided in Two sections. All questions are compulsory. Adhere to world limit wherever specified. The number of marks carried by a question is indicated against it.                              Paper I Q:-1 Write Notes on the following in about 150 words each: (10X5 =50) a) Phratry b) Society and culture c) Lineage and clan d) Insect taboo e) Cultural relativism Q:-2 Discuss the cardinal points of descents and culture. Explain segmentary lineage and territoriality. (20) Q:-3 Explain various types of marriages in Vedic culture. How various cultural and awakening movements influenced the institutional form of marriages. (20) Q:-4 Discuss various laws of succession in India.  What is the impact of industrialization on Famili...