C. S. (MAIN) EXAM,2009

ZOOLOGY

Paper II
Time Allowed Three Hours Maximu1n Marks 3oo

INSTRUCTIONS

Each question is printed both in Hindi and in English.
Answers must be written in the medium specified in the Adniission Certificate issued to you. which must be· stated clearly on the cover of the answer-book in the space provided for the purpose. No marks will be given for the answers ,vritten in a medium other than that · specified in the Admission Certificate.
Candidates should attempt Question Nos. 1 and 5 which are conipulsory, and any three of the remaining questions selecting at least one question from each Section.
Illustrate your_ answers with suitable diagrams wherever necessary.
All questions carry equal marks.

Section

1. Attempt any three of the following 20x3=60
Distinguish between sex-linked · inheritance and sex-limited inheritance.
Explain mimicry and its significance in the life of animals. Mention relevant examples.
Distinguish between mutation and isolation in the process of evolution ..
Distinguish between cladistics and classical taxonomy.

2.
Describe the structure.and functions of plasma: . · membrane and endoplasmic reticulum.
Explain processes of DNA replication and transcription. · .30x2=60

3. Explain the differences in gene regulation and its expression iri:eukaryotes.
Write a note on application of human blood group types in pedigree analysis. 30x2=60

4. Write short notes following:(around 200 words each) on the 20x3=60

Factors that contribute to the speciation of animals.
Binomial system of classification.
Human Genome Project .

Section

5. Comment on any three of the following 20x3=60

Biosynthesis of steroid hormones and their · functions.
Types of stem cells and their. applications.
Molecular mechanism of skeletal. muscle contraction.
Structure, arrangement and role · of photo receptors in the mammalian _eye .

6. Give an account of structure and role of cyclic AMP.
Explain the biochemical mechanism of conserV §ltion and release of energy in a cell.30x2=60

7 Explain the process of cellular aging and cell death.
Describe the structure -0f a mammalian nephron and explain how urine is formed ..30x2=60

8. Write short notes on the following in words each about 200 20x3=60

Structure of fatty acids and lipids.
Oogenesis in a mammal.
Role of immunoglobulins immunity .

Note English version of the lrzstructions is printed on . the front c;over of this question paper.