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Plant Growth and Mineral Nutrition

Maharashtra Board · Class 12 · Biology

Complete topic list for Plant Growth and Mineral Nutrition in Maharashtra Board Class 12 Biology. Key concepts, sub-topics, and what to focus on for board exams.

44 questions25 flashcards5 concepts

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4 Topics · Maharashtra Board Class 12 Biology

Topics in Plant Growth and Mineral Nutrition

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

Key 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?
Plant Growth and Mineral Nutrition covers several key topics that are frequently asked in Maharashtra Board 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 Plant Growth and Mineral Nutrition — Maharashtra Board Class 12 Biology?
Understand the core concepts first, then work through the 44 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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