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Growth and Development in Plants

Telangana Open School (TOSS) · Class 12 · Biology

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

43 questions35 flashcards5 concepts

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Key Topics to Revise

1

Growth and Development

  • Growth is an irreversible increase in size, number, or volume of cells, organs, or the whole plant.
  • Development includes all qualitative and quantitative changes from seed to death, including growth, differentiation, and maturation.
  • Growth occurs in three stages: cell division, cell enlargement, and cell differentiation.
2

Plant Growth Curve and Measurement

  • Sigmoid growth curve has three phases: Lag (slow), Log (rapid), and Stationary (plateau).
  • Grand period of growth is the time during which growth is fastest.
  • Growth can be measured in length, area, volume, or number of cells.
3

Factors Affecting Plant Growth

  • External factors: Light, temperature, water, and mineral nutrients.
  • Internal factors: Plant hormones (auxin, gibberellins, cytokinins, ethylene, abscisic acid).
  • Light is essential for photosynthesis and photoperiodism.
4

Plant Growth Regulators (Hormones)

  • Five major types: Auxin, Gibberellins, Cytokinins, Ethylene, Abscisic acid.
  • Auxin (IAA): Promotes cell elongation, apical dominance, prevents fruit drop.
  • Gibberellins: Promote stem elongation, break seed dormancy, induce parthenocarpy.

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Full Notes

Key Concepts

Growth refers to an irreversible increaseCellular growth occurs in three stagesA graph showing plant growth overChemicals produced in small amountsGermination is the revival of metabolic

Frequently Asked Questions

What are the important topics in Growth and Development in Plants for Telangana Open School (TOSS) Class 12 Biology?
Growth and Development in Plants 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 Growth and Development in Plants — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 43 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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