Indian Forest Service (Mains)
Chemistry optional
- 2 papers
- 200 marks each
- 3 h per paper
Paper I covers physical and inorganic chemistry.
All topics
Paper I, physical and inorganic chemistry
Bio-inorganic chemistry: every question, 2021 to 2025
9 parts worth 116 marks have been set on this unit in UPSC IFoS Chemistry Paper I from 2021 to 2025. Each one opens on its own page with the question, the answer in brief and the key points.
Syllabus
Metal ions in biological systems and their role in ion-transport across the membranes (molecular mechanism), ionophores, photosynthesis: PSI, PSII; nitrogen fixation, oxygen-uptake proteins, cytochromes and ferredoxins.
Notes: Bio-inorganic chemistry: haemoglobin, cytochromes, Fe–S proteins (full notes) · short notes
2025
- Q7(a) Photosynthesis and magnesium15 marks Question only
2024
- Q5(e) Why biological nitrogen fixation needs an enzyme8 marks Answered
- Q6(b) Haemoglobin oxygenation and carbon dioxide transport15 marks Question only
2023
- Q5(b) Haem, chlorophyll and fluorescence8 marks Answered
- Q7(a) Cytochrome P450 and its active oxidant15 marks Question only
2022
- Q6(b) The sodium–potassium pump15 marks Answered
- Q8(a) Cooperativity and the Bohr effect10 marks Question only
2021
- Q7(b) Z-scheme of photosynthetic electron transport15 marks Question only
- Q8(b) Magnesium in glycolysis15 marks Question only
Printed copy and Kindle
UPSC Indian Forest Service (Main) Chemistry Paper I: Model Answers 2021 to 2025
- All eight questions of each paper, with the question printed above its answer
- Physical chemistry numericals worked with units; inorganic structures drawn
- Topic-wise weightage and a topic-wise index