Zoology IAS Mains Question Paper 2023

Zoology IAS Mains Question Paper 2023:

There are Eight questions divided into Two Sections. 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.

Section- A:

1:- Write short notes on the following in about 150 words each: (10 x 5 = 50)

(a) Erythrocytic schizogony
(b) Statocyst of medusa
(c) Evolutionary status of Onychophora
(d) Neoteny
(e) Migration in birds

2:- (a) Define conjugation. Explain the mechanism of conjugation in Paramecium. Also give its significance. (20)
(b) Describe the different stages of life cycle of leech with the help of suitable diagram. (15)
(c) Describe the respiratory organs and mechanism of respiration in cockroach. (15)

3:- (a) Explain the general features, life cycle and pathogenicity of Taenia. (20)
(b) Give an illustrated account of origin of mammals. (15)
(c) Describe the perivisceral coelom and endoskeleton of Asterias. (15)

4:- (a) Draw a well-labelled diagram of adrenal gland and discuss the functions of its hormones. (20)
(b) Describe the general features and life cycle of Ascaris. (15)
(c) What are the skeletal elements of sponges? Describe the structure and types of various skeletal elements found in sponges. (15)

Section- B:

5:- Write notes on the following in about 150 words each: (10 x 5 = 50)

(a) Ecological niche
(b) Instinct behaviour in animals
(c) Pathogenesis of cholera
(d) Amniocentesis
(e) Lotka-Volterra model

6:- (a) Define regression. Explain different methods and applications of regression analysis. (20)
(b) Define food chain. Describe different types of food chain with suitable examples. (15)
(c) Describe the phenomenon of altruism and kinship in studying animal behaviour with suitable examples. (15)

7:- (a) What is lac culture? Explain the life cycle of lac insect and describe cultivation and processing of lac in India. Also add a note on its economic importance, (20)
(b) What is Project Tiger? Discuss the various threats and conservation strategies to protect tigers in India. (15)
(c) Define imprinting. Describe the mechanism of imprinting in animals with suitable examples. (15)

8:- (a) What is ELISA? Explain the principle, types, procedure and applications of ELISA.  (20)
(b) Describe the symptoms, diagnosis, treatment and preventive measures of livestock diseases. (15)
(c) Define crypsis. Explain the types and mechanism of crypsis in animals with suitable examples. (15)

Section- A:

1:- Write your answer in about 150 words for each of the following: (10 x 5 = 50)

(a) Write about different ways by which biodiversity is being threatened.
(b) How is hn RNA (primary transcript) modified into functional m-RNA in eukaryotes?
(c) “Continental drift has resulted in discontinuous distribution of alligators and lungfishes”. Justify.
(d) Write principle and application of RFLP.
(e) Describe receptor-mediated endocytosis (RME) along with its advantage.

2:- (a)  Give structure of t-RNA. Write role of different RNAs in the translation process. (20)
(b) Describe the principle and method of whole animal cloning. (15)
(c) Explain Stanley Miller experiment. In which way, it provided support to most acceptable theory of origin of life? (15)

3:- (a) Describe the structure of mitochondrion. Why is it known as powerhouse of the cell? (20)
(b) Explain the mechanism of sex determination in human beings. (15)
(c) Describe various means which result in change in gene frequencies in a population. (15)

4:- (a)  Explain the following: (i) Haemophilia (ii) Red-green colour blindness (10 x 2 = 20)
(b) Describe various stages of prophase of meiosis-I in an animal cell. (15)
(c) Explain phenomenon of natural selection taking examples of peppered moth and sickle cell anaemia. (15)

Section- B:

5:- Write your answer in about 150 words for each of the following: (10 x 5 = 50)

(a) Highlight role of various hormones in the regulation of digestive secretions.
(b) Describe the balance sheet of ATP production in glycolysis.
(c) Write a note on acrosome reaction during fertilization.
(d) List different neurotransmitters. Explain the role of specific neurotransmitter across neuromuscular junction.
(e) Explain competitive and non-competitive enzyme inhibition.

6:- (a) Classify carbohydrates by giving suitable examples. Also, mention characteristics of each category. (20)
(b) Explain the structure of haemoglobin and its role in carbon dioxide transport. (15)
(c) Describe various techniques of in vitro fertilization. (15)

7:- (a) Give an account of hormonal regulation of menstruation in human females. (20)
(b) Explain the source(s) and functions of the following: (i) Vitamin B₁ (ii) Vitamin B₂ (iii) Vitamin B₁₂ (5 x 3 = 15)
(c) Write in detail three phases of oogenesis in human females. (15)

8:- (a) Explain enzymes, their characteristics as well as induced-fit model of mechanism of enzyme action. (20)
(b) List various coagulation factors and describe their role in blood clotting. (15)
(c) Exaplin neoteny phenomenon taking suitable example. How is it different from paedogenesis? (15)