Zoology Optional 2023 Paper UPSC | IAS Paper 1 and Paper 2 Questions | Previous Years Papers (PYQs)

Zoology Optional UPSC IAS 2023 Paper 1 2023

Paper 1 2023 SECTION A

1.Write short notes on the following in about 150 words each :

1(a) Erythrocytic schizogony (IAS 2023/10 Marks)

1(b) Statocyst of medusa (IAS 2023/10 Marks)

1(c) Evolutionary status of Onychophora (IAS 2023/10 Marks)

1(d) Neoteny (IAS 2023/10 Marks)

1(e) Migration in birds (IAS 2023/10 Marks)

2(a) Define conjugation. Explain the mechanism of conjugation in Paramecium. Also give its significance. (IAS 2023/20 Marks)

2(b) Describe the different stages of life cycle of leech with the help of suitable diagram. (IAS 2023/15 Marks)

2(c) Describe the respiratory organs and mechanism of respiration in cockroach. (IAS 2023/15 Marks)

3(a) Explain the general features, life cycle and pathogenicity of Taenia. (IAS 2023/20 Marks)

3(b) Give an illustrated account of origin of mammals. (IAS 2023/15 Marks)

3(c) Describe the perivisceral coelom and endoskeleton of Asterias. (IAS 2023/15 Marks)

4(a) Draw a well-labelled diagram of adrenal gland and discuss the functions of its hormones. (IAS 2023/20 Marks)

4(b) Describe the general features and life cycle of Ascaris. (IAS 2023/15 Marks)

4(c) What are the skeletal elements of sponges? Describe the structure and types of various skeletal elements found in sponges. (IAS 2023/15 Marks)

Paper 1 2023 SECTION B

5. Write short notes on the following in about 150 words each:

5(a) Ecological niche (IAS 2023/10 Marks)

5(b) Instinct behaviour in animals (IAS 2023/10 Marks)

5(c) Pathogenesis of cholera (IAS 2023/10 Marks)

5(d) Amniocentesis (IAS 2023/10 Marks)

5(e) Lotka-Volterra model (IAS 2023/10 Marks)

6(a) Define regression. Explain different methods and applications of regression analysis. (IAS 2023/20 Marks)

6(b) Define food chain. Describe different types of food chain with suitable examples. (IAS 2023/15 Marks)

6(c) Describe the phenomenon of altruism and kinship in studying animal behaviour with suitable examples. (IAS 2023/15 Marks)

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. (IAS 2023/20 Marks )

7(b) What is Project Tiger? Discuss the various threats and conservation strategies to protect tigers in India. (IAS 2023/15 Marks)

7(c) Define imprinting. Describe the mechanism of imprinting in animals with suitable examples. (IAS 2023/15 Marks)

8(a) What is ELISA? Explain the principle, types, procedure and applications of ELISA. (IAS 2023/20 Marks)

8(b) Describe the symptoms, diagnosis, treatment and preventive measures of livestock diseases. (IAS 2023/15 Marks)

8(c) Define crypsis. Explain the types and mechanism of crypsis in animals with suitable examples. (IAS 2023/15 Marks)

Zoology Optional UPSC IAS 2023 Paper 2 2023

Paper 2 2023 SECTION A

1. Write your answer in about 150 words for each of the following:

1(a) Write about different ways by which biodiversity is being threatened. (IAS 2023/10 Marks)

1(b) How is hn RNA (primary transcript) modified into functional m-RNA in eukaryotes? Explain. (IAS 2023/10 Marks)

1(c) "Continental drift has resulted in discontinuous distribution of alligators and lungfishes". Justify. (IAS 2023/10 Marks)

1(d) Write principle and application of RFLP. (IAS 2023/10 Marks)

1(e) Describe receptor-mediated endocytosis (RME) along with its advantage.( IAS 2023/10 Marks)

2(a) Give structure of t-RNA. Write role of different RNAs in the translation process. (IAS 2023/20 Marks)

2(b) Describe the principle and method of whole animal cloning. (IAS 2023/15 Marks)

2(c) Explain Stanley Miller experiment. In which way, it provided support to most acceptable theory of origin of life? (IAS 2023/15 Marks)

3(a) Describe the structure of mitochondrion. Why is it known as powerhouse of the cell? (IAS 2023/20 Marks)

3(b) Explain the mechanism of sex determination in human beings. (IAS 2023/15 Marks)

3(c) Describe various means which result in change in gene frequencies in a population. (IAS 2023/15 Marks)

4(a) Explain the following: 
(i) Haemophilia (IAS 2023/10 Marks)
(ii) Red-green colour blindness (IAS 2023/10 Marks)

4(b) Describe various stages of prophase of meiosis-I in an animal cell. (IAS 2023/15 Marks)

4(c) Explain phenomenon of natural selection taking examples of peppered moth and sickle cell anaemia. (IAS 2023/15 Marks)

Paper 2 2023 SECTION B

5. Write your answer in about 150 words for each of the following:

5(a) Highlight role of various hormones in the regulation of digestive secretions (IAS 2023/10 Marks)

5(b) Describe the balance sheet of ATP production in glycolysis. (IAS 2023/10 Marks)

5(c) Write a note on acrosome reaction during fertilization. (IAS 2023/10 Marks)

5 (d) List different neurotransmitters. Explain the role of specific neurotransmitter across neuromuscular junction. (IAS 2023/10 Marks)

5 (e) Explain competitive and non-competitive enzyme inhibition. (IAS 2023/10 Marks)

6(a) Classify carbohydrates by giving suitable examples. Also, mention characteristics of each category. (IAS 2023/20 Marks)

6(b) Explain the structure of haemoglobin and its role in carbon dioxide transport. (IAS 2023/15 Marks)

6(c) Describe various techniques of in vitro fertilization. (IAS 2023/15 Marks)

7(a) Give an account of hormonal regulation of menstruation in human females. (IAS 2023/20 Marks)

7(b) Explain the source(s) and functions of the following:
(i) VitaminB1 (IAS 2023/5 Marks)
(ii) Vitamin B2 (IAS 2023/5 Marks)
(iii) Vitamin B12 (IAS 2023/5 Marks)

7(c) Write in detail three phases of oogenesis in human females. (IAS 2023/15 Marks)

8(a) Explain enzymes, their characteristics as well as induced-fit model of mechanism of enzyme action. (IAS 2023/20 Marks)

8(b) List various coagulation factors and describe their role in blood clotting. (IAS 2023/15 Marks)

8(c) Explain neoteny phenomenon taking suitable example. How is it different from paedogenesis? (IAS 2023/15 Marks)