JKPSC KAS Mains 2022 Zoology Paper 2:
INSTRUCTIONS
Please read each of the following instructions carefully before attempting the paper.
(i) There are eight questions divided in two Sections and printed in English. Candidate has to attempt Five questions in All. Questions No. 1 and 5 are compulsory and out of the remaining, any Three are to be attempted choosing at least One question from each Section. The number of marks carried by a Question/Part is indicated against it. Answers must be written in English in Question-Cum-Answer (QCA) Booklet in the space provided.
(ii) Your answer should be precise and coherent.
(iii) If you encounter any typographical error, please read it as it appears in the text book.
(iv) Candidates are in their own interest advised to go through the general instructions on the back side of the title page of the Answer Script for strict adherence.
(v) No continuation sheets shall be provided to any candidate under any circumstances.
(vi) No blank page be left in between answer to various questions.
SECTION- A
1. Answer the following in about 150 words each:
(a) Write a note on IVF and embryo transfer. (10)
(b) Explain the types and functions of salivary glands in mammals. (10)
(c) Compare the transport of small and large molecules across plasma membrane. (10)
(d) Explain enzyme kinetics with the help of suitable examples. (10)
(e) Write a note on protective and warning mimicry. (10)
2. (a) Explain, with help of a diagram, the processing and presentation of endogenous and exogenous antigens. (20)
(b) Describe the sex determination in Drosophila. Add a note on polyploidy and gynandromorphism in Drosophila. (15)
(c) Describe the changes undergone by mammalian sperm in the female reproductive tract. Explain how polyspermy is avoided in humans. (15)
3. (a) Give an account of the process of transcription, explaining the initiation complex and events leading to mRNA formation in eukaryotes. (20)
(b) Give a neat, labelled diagram, to explain Kreb’s cycle. (15)
(c) What are fate maps? Elaborate the different techniques to make fate maps. Draw the fate map of frog. (15)
4. (a) Define hormones. Differentiate between Steroid and Peptide hormones by giving examples. Add a note on the mechanism of action of Steroid and Peptide hormones. (20)
(b) What is hemophilia? How is it genetically inherited? Add a note on its symptoms and treatment. (15)
(c) Discuss the concept of cladistics, its various types and role in biology. What are its disadvantages? (15)
SECTION- B
5. Answer the following in about 150 words each.
(a) Differentiate between sympatric and allopatric speciation. (10)
(b) Explain what are DNA binding motifs and their significance? (10)
(c) Explain internal ear of mammal with the help of a well labelled diagram. (10)
(d) Give an account of the hormones secret by the pituitary gland. (10)
(e) What is neoteny? Explain with suitable examples. (10)
6. (a) Explain with suitable diagrams the molecular mechanism of skeletal muscle contraction. Add a note on the bioenergetics of muscle contraction and causes of muscle cramps. (20)
(b) Discuss recombinant DNA technology, its basic principle and major applications in research. (15)
(c) What are fossils? Explain the process of fossilization. Discuss the evolution of elephant with the help of suitable diagrams. (15)
7. (a) Explain ‘C-value’ paradox. Discuss the ultrastructure of chromatin, with special emphasis on nucleosome and solenoid model of chromatin. (20)
(b) Give an account of the process of initiation of blood coagulation, explaining the role of different factors. (15)
(c) What are caspases? Explain their role in programmed cell death. (15)
8. (a) What is a synapse? Explain different types of synapses. Add a note on various kinds of neurotransmitters and their importance in synaptic transmission. (20)
(b) Explain with suitable examples, the role of adaptive radiation in the evolution of aquatic and terrestrial animals. (15)
(c) State and explain the three Mendel’s laws of inheritance. Give an account of various deviations from Mendel’s findings using appropriate examples. (15)
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