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Plant Growth and Development

ICSE · Class 11 · Biology

Quick revision notes for Plant Growth and Development — ICSE Class 11 Biology. Key concepts, formulas, and definitions for last-minute revision.

60 questions47 flashcards5 concepts

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An infographic comparing the three main types of plant life cycles: Haplontic, Diplontic, and Haplo-diplontic, highlighting the dominant phase and key organisms for each.
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Key Topics to Revise

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1. Growth, Development, and Measurement of Growth

  • Growth means irreversible quantitative increase in the size of a cell, organ, or whole organism.
  • Development is the whole series of changes that an organism undergoes during its life cycle.
  • Plant growth is open-ended because meristems keep adding new cells throughout life.
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2. Phases of Growth and Factors Affecting Growth

  • Plant growth commonly follows an S-shaped or sigmoid curve.
  • The three phases are initial lag phase, logarithmic or exponential phase, and stationary phase.
  • In the lag phase, the system prepares for growth and growth is slow.
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3. Plant Growth Regulators

  • There are five classes of plant hormones: auxins, gibberellins, cytokinins, abscisic acid, and ethylene.
  • Plant growth regulators are organic substances other than nutrients that modify physiological processes in minute amounts.
  • Plant hormones often show multiple effects depending on tissue and age.
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4. Auxins

  • Auxin is a generic name for the growth hormone produced by the tip of a coleoptile and needed for elongation.
  • IAA is the principal natural auxin found in all plants.
  • Auxin was first conceived by Charles Darwin and Francis Darwin in 1881.

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Full Notes

Key Concepts

Growth is an irreversible quantitative changeGrowth can be measured by increaseGrowth follows a sigmoid curveThe increased growth per unit timeWater

Frequently Asked Questions

What are the important topics in Plant Growth and Development for ICSE Class 11 Biology?
Plant Growth and Development covers several key topics that are frequently asked in ICSE Class 11 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 Development — ICSE Class 11 Biology?
Understand the core concepts first, then work through the 60 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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