Chapter 7 of 15
Revision Notes
Plant Growth and Mineral Nutrition — Revision Notes
Maharashtra Board · Class 12 · Biology
Plant Growth and Mineral Nutrition revision notes for Maharashtra Board Class 12 Biology: 4 topics in quick points.
44 questions25 flashcards2 formulas & key relations5 concepts
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Key Topics to Revise
1
Plant Growth - Definition and Characteristics
- Growth is permanent, irreversible increase in bulk accompanied by change of form
- Two aspects: Quantitative (increase in size, volume, mass) and Qualitative (development and differentiation)
- In vascular plants, growth is indeterminate (continues throughout life) and restricted to meristems
2
Phases of Growth
- Three distinct phases corresponding to cell division, enlargement, and maturation
- Phase of Cell Division: Meristematic cells divide mitotically; slow growth rate (Lag phase)
- Phase of Cell Enlargement: Cells become vacuolated, turgid; rapid growth (Exponential/Log phase)
3
Growth Rate and Types of Growth
- Growth rate = increased growth per unit time (efficiency index)
- Absolute Growth Rate (AGR) = dn/dt (change in cell number over time)
- Relative Growth Rate (RGR) = AGR/n (growth rate relative to existing size)
4
Growth Curves and Development Processes
- Growth curves: Linear (arithmetic), Exponential (geometric), Sigmoid (S-shaped)
- Sigmoid curve has three phases: Lag, Log, and Stationary phases
- Grand Period of Growth = total time for all growth phases
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Full NotesKey Concepts
Plant growth is defined as permanentPlants exhibit two types of growthFive major plant hormones regulate growthThe response of plants to relativeThe induction of early flowering by
Frequently Asked Questions
What are the important topics in Plant Growth and Mineral Nutrition for Maharashtra Board Class 12 Biology?
Key topics in Plant Growth and Mineral Nutrition include Plant Growth - Definition and Characteristics, Phases of Growth, Growth Rate and Types of Growth, Growth Curves and Development Processes. Study these first, then practise questions on each for the Maharashtra Board Class 12 board exam.
How should I revise Plant Growth and Mineral Nutrition for the Maharashtra Board Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Plant Growth and Mineral Nutrition. 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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