Chapter 27 of 41
Revision Notes
Photosynthesis — Revision Notes
Telangana Open School (TOSS) · Class 12 · Biology
Photosynthesis revision notes for Telangana Open School (TOSS) Class 12 Biology: 4 topics in quick points. Includes Significance of Photosynthesis, Site.
47 questions30 flashcards5 concepts
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Key Topics to Revise
1
Significance of Photosynthesis
- Photosynthesis converts light energy into chemical energy stored in glucose.
- It is the primary source of organic matter for all living organisms.
- Oxygen released during photosynthesis supports aerobic respiration in most organisms.
2
Site and Pigments of Photosynthesis
- Chloroplasts are the site of photosynthesis, mainly found in mesophyll cells of leaves.
- Thylakoids contain pigments like chlorophyll-a, chlorophyll-b, carotenoids, and xanthophylls.
- Chlorophyll-a is the main pigment that traps light energy and drives the process.
3
Light Reaction (Photochemical Phase)
- Occurs in the thylakoid membranes of chloroplasts.
- Requires light and involves Photosystem II (PSII) and Photosystem I (PSI).
- Water is split into oxygen, protons, and electrons in a process called photolysis.
4
Dark Reaction (Biosynthetic Phase / Calvin Cycle)
- Takes place in the stroma of chloroplasts and does not require light directly.
- Uses ATP and NADPH from light reaction to fix CO₂ into glucose.
- Main enzyme involved is RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase).
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Full NotesKey Concepts
Photosynthesis is the process byChloroplasts are doubleLight reactions occur in thylakoidsC3 plants fix CO₂ directly intoInternal factors include chlorophyll content
Frequently Asked Questions
What are the important topics in Photosynthesis for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Photosynthesis include Significance of Photosynthesis, Site and Pigments of Photosynthesis, Light Reaction (Photochemical Phase), Dark Reaction (Biosynthetic Phase / Calvin Cycle). Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Photosynthesis for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 47 practice questions on Photosynthesis. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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