Zoology IAS Paper 1 UPSC 2021 with Solutions

Zoology Paper 1 UPSC 2021 - Question Paper with Solutions 

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Section-A

1. Write notes in about 150 words each for Q. Nos. 1(a) to 1 (d) and answer Q. No. 1(e):

Zoology 1a Canal system in sponges. (IAS 2021/10 Marks)

Zoology 1b Nematocysts of Aurelia. (IAS 2021/10 Marks)

Zoology 1c Trochophore larva and its evolutionary significance. (IAS 2021/10 Marks)

Zoology 1d Origin of tetrapods. (IAS 2021/10 Marks)

Zoology 1e Draw a well-labelled diagram of avian brain. (IAS 2021/10 Marks)

Zoology 2a What is metamorphosis? Describe the hormonal regulation of metamorphosis in insects. (IAS 2021/20 Marks)

Zoology 2b What is alternation of generations? Illustrate this phenomenon with life history of Obelia. (IAS 2021/15 Marks Marks)

Zoology 2c Describe the structure and functions of internal ear in mammals. (IAS 2021/15 Marks Marks)

Zoology 3a What is hypothalamo-pituitary axis? Draw a well-labelled diagram of pituitary gland and describe the functions of its hormones. (IAS 2021/20 Marks)

Zoology 3b Define nephridium. Describe the various types of nephridia found in Pheretima. (IAS 2021/15 Marks Marks)

Zoology 3c Describe the respiratory organs and mechanism of respiration in Pila. (IAS 2021/15 Marks Marks)

Zoology 4a Define double circulation. Give a comparative account of heart in reptiles, birds and mammals. (IAS 2021/20 Marks)

Zoology 4b Describe habitat, habits and life history of Branchiostoma. (IAS 2021/15 Marks Marks)

Zoology 4c Give an illustrated account of life cycle of Leishmania. (IAS 2021/15 Marks Marks)

Section-B

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

Zoology 5a Vermiculture (IAS 2021/10 Marks)

Zoology 5b FISH (IAS 2021/10 Marks)

Zoology 5c Biological clock (IAS 2021/10 Marks)

Zoology 5d Ecological succession (IAS 2021/10 Marks)

Zoology 5e Biodiversity hotspots (IAS 2021/10 Marks)

Zoology 6a Define correlation. Explain its types and methods of computing coefficient of correlation. (IAS 2021/20 Marks)

Zoology 6b Write note on ecological pyramids with suitable examples. (IAS 2021/15 Marks Marks)

Zoology 6c What are pheromones? Discuss their role in insects. (IAS 2021/15 Marks Marks)

Zoology 7a What is transgenesis? Describe the methods and applications of transgenesis in animals. (IAS 2021/20 Marks)

Zoology 7b Describe the principle and applications of polymerase chain reaction (PCR). (IAS 2021/15 Marks Marks)

Zoology 7c Explain the process of learning and memory in animals with suitable example. (IAS 2021/15 Marks Marks)

Zoology 8a Define ecosystem. Discuss the structure and functions of ecosystem. (IAS 2021/20 Marks)

Zoology 8b What is apiculture? Describe the various methods of beekeeping and also add a note on the uses of honey. (IAS 2021/15 Marks Marks)

Zoology 8c Differentiate between SEM and TEM. (IAS 2021/15 Marks Marks)