| Detail | Information |
|---|---|
| Examination | Indian Forest Services (Main) Examination |
| Year | 2025 |
| Conducting Body | Government of India |
| Paper | Zoology Paper-I |
| Subject | Zoology |
| Duration | Three Hours Maximum Marks: 200 Question Paper Specific Instructions Please Read Each Of The Following Instructions Carefully Before Attempting Questions There Are Eight Questions In All, Out Of Which Five Are To Be Attempted. Question Nos. 1 And 5 Are Compulsory. Out Of The Remaining Six Questions, Three Are To Be Attempted Selecting At Least One Question From Each Of The Two Sections A And B. Attempts Of Questions Shall Be Counted In Sequential Order. Unless Struck Off, Attempt Of A Question Shall Be Counted Even If Attempted Partly. Any Page Or Portion Of The Page Left Blank In The Question-cum-answer Booklet Must Be Clearly Struck Off. All Questions Carry Equal Marks. The Number Of Marks Carried By A Question/part Is Indicated Against It. Neat Sketches May Be Drawn, Wherever Required. Answers Must Be Written In English Only. |
| Maximum Marks | 200 |
| Number of Questions | 8 |
| Question Type | Descriptive / Subjective |
Zoology Paper I for the UPSC Indian Forest Service (Main) 2025 comprises descriptive questions in two sections. Page 1 contains the exam header and general instructions. Page 2 presents repaired and clarified questions on topics such as horns and antlers, metamorphosis, hormones, symmetry, Sphenodon, fish migration, coelenterates, aquatic mammals and primates, cochlear structure and hearing, polychaetes, Platyhelminthes, adenohypophyseal hormones, honeybee mouthparts, and Echinodermata. The section also includes Section B with population age pyramids, flame photometry, sign stimuli, F-test, and prawn culture. The OCR has been repaired to preserve numbering, sub-parts, and the intended descriptive format.
(a) 1. Write a brief account on each of the following: Horns and antlers in mammals Hormonal regulation of metamorphosis in insects
(b) Gonadal hormones and their functions
(c) Types of symmetry in animals
(d) Status of Sphenodon
(e) 15
(a) Indian Forest Services (Main) 8 × 5 = 40 1. Write a brief account on each of the following: Horns and antlers in mammals Hormonal regulation of metamorphosis in insects
(b) Gonadal hormones and their functions
(c) Types of symmetry in animals
(d) Status of Sphenodon
(e) 15
(a) Explain the migration in fishes with suitable examples. Describe the defensive structures and their mechanism of action in
(b) coelenterates. Elaborate the general features of aquatic mammals and primates. 10 |c| Draw a transverse section of mammalian cochlea and explain how hearing is з. (a) affected.
(c) Describe the modes of life in polychaetes. (b) Discuss the various parasitic adaptations in Platyhelminthes. 10 |c| Explain the various adenohypophyseal hormones and their physiological 4. (a) functions. 15 Describe the modification of mouthparts in honeybee. (b) Classify the phylum Echinodermata up to class level and highlight the specific features of each class with examples.
(d) SECTION-B 8 × 5 = 40 5. Write a brief account on each of the following : Population age pyramids (a) Principle, working and application of flame photometry (b) Sign stimuli c) F-test and its application in biology Prawn culture
(e) DJSM-U-ZOLY/59 \overline2
(a) Explain the migration in fishes with suitable examples. Describe the defensive structures and their mechanism of action in
(b) coelenterates. Elaborate the general features of aquatic mammals and primates. 10 |c| Draw a transverse section of mammalian cochlea and explain how hearing is з. (a) affected.
(c) Describe the modes of life in polychaetes. (b) Discuss the various parasitic adaptations in Platyhelminthes. 10 |c| Explain the various adenohypophyseal hormones and their physiological 4. (a) functions. 15 Describe the modification of mouthparts in honeybee. (b) Classify the phylum Echinodermata up to class level and highlight the specific features of each class with examples.
(d) SECTION-B 8 × 5 = 40 5. Write a brief account on each of the following : Population age pyramids (a) Principle, working and application of flame photometry (b) Sign stimuli c) F-test and its application in biology Prawn culture
(e) DJSM-U-ZOLY/59 \overline2
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The paper lists 8 questions as per the official booklet.