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Revision Notes

Plant Growth and Development — Revision Notes

CBSE · Class 11 · Biology

Plant Growth and Development revision notes for CBSE Class 11 Biology: 4 topics in quick points. Part of the CBSE Class 11 Biology syllabus.

105 questions80 flashcards2 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Growth and Its Nature

  • Growth is an irreversible permanent increase in size of an organ, its parts, or even a single cell.
  • Growth is accompanied by anabolic and catabolic metabolic processes that use energy.
  • Plants retain the capacity for unlimited growth throughout life because meristems keep adding new cells.
2

2. Phases of Growth and Growth Rates

  • The period of growth is divided into three phases: meristematic, elongation, and maturation.
  • Meristematic cells are rich in protoplasm, have large nuclei, thin primary cellulosic walls, and abundant plasmodesmata.
  • The elongation phase shows increased vacuolation, cell enlargement, and new cell wall deposition.
3

3. Conditions for Growth and Differentiation

  • Water, oxygen, and nutrients are essential for growth.
  • Water is needed for cell enlargement and turgidity, which help extension growth.
  • Oxygen provides metabolic energy needed for growth activities.
4

4. Plasticity and Factors Controlling Development

  • Plasticity is the ability of a plant to follow different developmental pathways in response to environment or life phase.
  • Heterophylly in cotton, coriander, and larkspur is an example of plasticity.
  • In buttercup, leaves formed in air differ from leaves formed in water, showing environmental plasticity.

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Full Notes

Key Concepts

Growth is an irreversible permanent increasePlants retain the capacity for unlimitedMeristems are regions of active cellGrowth occurs in three phasesIn arithmetic growth

Frequently Asked Questions

What are the important topics in Plant Growth and Development for CBSE Class 11 Biology?
Key topics in Plant Growth and Development include Growth and Its Nature, Phases of Growth and Growth Rates, Conditions for Growth and Differentiation, Plasticity and Factors Controlling Development. Study these first, then practise questions on each for Class 11 exams.
How should I revise Plant Growth and Development for Class 11 exams?
Learn the core ideas first, then work through the 105 practice questions on Plant Growth and Development. 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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All CBSE Class 11 Biology Revision Notes

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