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Photosynthesis

Telangana Open School (TOSS) · Class 12 · Biology

Quick revision notes for Photosynthesis — Telangana Open School (TOSS) Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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 Notes

Key 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?
Photosynthesis covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Photosynthesis — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 47 practice questions available for this chapter. Revise formulas and 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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