COMBINED COMPETITIVE EXAMINATION (MAIN)
ZOOLOGY
Paper-II
Time 3 hours Full Marks 200
Note: Thefiguresinthe right-handmarginindicate..fu,llmarksforthequestions.

Attempt five questions in all.


Question No. 1 is compulsory.


Suitable diagrams may be drawn, wherever required.


1. Answer any ten of the following 4xlO=40

Differentiate between euchromatin and heterochromatin.


Define mitotic cell division and meiotic cell division.


Give one example each of carbohydrate, protein, lipid and

vitamin.


Compare between the processes of blastulation and gastrulation.


Write in brief the structure and function of haemoglobin.


Distinguish between resting potential and action potential.


Give an example each of glucocorticoid hormone, progestogen,


Differentiate between a hormone and a pherozpone.
Distinguish between an antigen and an antibody.
Mention the sources of gonadotropin rele,asing hormone,
calcitonin, glucagon and aldosterone.
Write briefly about the functions of placenta.
Distinguish between species and sub-species.

androgen and estrogen..
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2. Answer any eight of the following 5x8=40

Write briefly about different types of white blood cell.


Compare between DNA and RNA of eukaryotes.


Give a brief account of the functions of eukaryotic gene.


Distinguish between transcription and translation.


Differentiate between skeletal muscle and smooth muscle.


Write briefly about normal and abnormal karyotypes.


Compare between glycolysis and gluconeogenesis.


Write briefly about the process of regeneration and its significance.


Give a brief account of zoogeographical realms.


What is enzyme? Write in brief about different types of enzyme.


3. Answer any five of the following 8x5=40

Write briefly about the mechanism of blood coagulation.


What are the principles of classification of animal?


Enlist hormones of thyroid and parathyroid and their functions.


•

Write in brief about different types of placenta in mammals.


Briefly describe the 'role of organizers during organogenesis.


What is the fate of embryonic membranes in chick?


Explain cytoplasmic inheritance.


4. Answer any four of the following lOx4=40
Briefly mention different phases in mitotic cell division.
.

What is aging? Elaborate consequences of aging in human.


What is balanced diet? Write in brief about the important components of a balanced diet.


Briefly explain the process of spermatogenesis.


Explain the process of vision.


Give a brief account of the principles and theories of continental distribution of animals.


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5. Answer any two of the following 20x2=40

Briefly describe different phases of meiotic cell division. Explain, why meiotic division is also called as reduction division.


What is transcription? Briefly explain the process of transcription in eukaryotes.


Describe the mechanism of action of a peptide hormone via cAMP leading' to gene activation.


6. Answer any four of the following lOx4=40

Write briefly about the Watson-Crick model of DNA structure.


Enlist pituitary hormones and their functions.


Briefly explain the role of hormones in metamorphosis and development of insects.


Give brief description of cellular immunity and humoral immunity.


Compare between oogenesis and spermatogenesis.


7. Answer any two of the following 20x2=40

Describe the structure of mitochondria. Discuss the tricarboxylic acid cycle with special reference to oxidative enzymes.


What is mutation? Mention different types of mutation. Write briefly about the role of mutations in evolution.


What is oxidative phosphorylation? Briefly describe the process of ATP formation via electron transport chain.


8. Write short notes on the following lOx4=40

Chromosomal aberrations


Genetic code


Darwin's theory of evolution


Neural regulation of breathing


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9. Discuss in detail about the following: 8xS=40
Structure of nucleus and nucleolus
Mendelian laws of inheritance
Steroid hormones
Role of pancreas in digestion of food
Metamorphosis in frog
10. Briefly explain the following: 4xlO=40
Role of ribosomes in protein synthesis
Importance of blood groups in blood transfusion
Sex chromosomes and sex determination
Genetic disorders
Types of carbohydrate
Mechanism of enzyme action
Temperature regulation in man
Impulse conduction across synapse
Photoperiodic regulation of diurnal rhythm of melatonin

Organogenesis of kidney


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