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Telangana Open School (TOSS) Class 12 Biology — Formula Sheet

Telangana Open School (TOSS) Class 12 Biology formula sheet, chapter by chapter — 5 formulas across 2 chapters. Follows the TOSS syllabus.

How to Use the Formula Sheet

  1. Write, don't just read — writing each formula out helps it stick.
  2. Understand the derivation — you can rebuild a formula you half-remember.
  3. Group related formulas — link the ones that build on each other.
  4. Test yourself — cover the sheet and write the formulas from memory.

Chapter-Wise Formulas — 2 Chapters

12

Sex Determination

3 entries
Sex Index Ratio = X / A
If X/A = 1.0 or more → Female; if X/A = 0.5 or less → Male; if between 0.5 and 1.0 → Intersex.
Ratio ≥ 1.0 → Female; ≤ 0.5 → Male; between → Intersex.
The full Sex Determination formula sheet
21

Absorption, Transport and Water Loss in Plants

2 entries
Pure water has ψ = 0; adding solutes makes ψ negative.
Water potential (ψ) drives water movement; pure water = 0; solutions < 0.
The full Absorption, Transport and Water Loss in Plants formula sheet

Get chapter-wise help for Telangana Open School (TOSS) Class 12 Biology

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Frequently Asked Questions

Where can I find Telangana Open School (TOSS) Class 12 Biology Formula Sheet?

This page has formula sheet for 2 chapters of Telangana Open School (TOSS) Class 12 Biology for the board exams 2027. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

Learn the formulas you use most first, and understand what each symbol means so you can apply them. Knowing where a formula comes from helps you rebuild it if you forget it in the exam.

Browse Formula Sheet by Chapter

2 chapters

12

Sex Determination

21

Absorption, Transport and Water Loss in Plants

More Biology Resources

Telangana Open School (TOSS) Class 12

Practice Quiz

Test yourself with quick quizzes

Important Questions

Exam-style questions with answers

Revision Notes

Key concepts and quick revision points

Chapter Summary

Understand each chapter at a glance

Concept Maps

Diagrams showing how topics connect

Study Plan

Week-by-week preparation schedule

Flashcards

Quick-fire cards for active recall practice

Syllabus

Chapter list and the topics in each

Other Telangana Open School (TOSS) Class 12 Subjects

PhysicsChemistryMathematicsEconomicsAccountancyGeographyCommunity Science (Home Science)