Class 11 Biology — Chapter 13: PLANT GROWTH AND DEVELOPMENT
Chapter 13: PLANT GROWTH AND DEVELOPMENT is a chapter in Class 11 Biology (NCERT), part of the CBSE NCERT curriculum followed by over 25 million students across India. This chapter covers 6 topics including Characteristics of Plant Growth, Primary and Secondary Growth, Phases of Growth. BrainWeave provides free AI-powered explanations — by voice or text, in Hindi or English — with no signup required.
What you'll learn
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▸Characteristics of Plant GrowthCore conceptgrowthirreversibleindeterminate growthmeristemsopen form
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▸Primary and Secondary GrowthCore conceptprimary growthsecondary growthapical meristemlateral meristemgirth
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▸Phases of GrowthCore conceptmeristematicelongationmaturationroot apexprotoplasm
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▸Measurement of Growthmeasurable growthdry weightfresh weightcell numbersurface area
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▸Growth Rates: Arithmetic GrowthCore conceptgrowth ratearithmetic growthlinear curveconstant rateLt = L₀ + rt
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▸Plant Development Conceptsdevelopmentdifferentiationzygoteseed germinationintrinsic factors
Chapter Summary
Understand the fundamental definition of growth as an irreversible permanent increase in size. Recognize the unique 'indeterminate' or 'open form' of growth in plants, where they grow continuously throughout their life due to meristematic tissues.
Differentiate between the two main types of plant growth. Primary growth, facilitated by apical meristems, results in the elongation of the plant's axis. Secondary growth, driven by lateral meristems (vascular and cork cambium), leads to an increase in the plant's girth.
Describe the three distinct phases of growth occurring in regions like root and shoot tips: the meristematic phase (active cell division), the elongation phase (cell enlargement and vacuolation), and the maturation phase (cells attain final size and differentiate).
Identify the various parameters used to quantify plant growth, such as increase in fresh weight, dry weight, length, area, volume, and cell number. Understand that the chosen parameter depends on the type of growth being measured.
Define and explain the concept of arithmetic growth, where following cell division, one daughter cell continues to divide while the other differentiates. Recognize that this results in a linear growth curve and can be expressed mathematically as Lt = L₀ + rt.
Understand that 'development' in a plant is the sum of two processes: 'growth' and 'differentiation'. This concept explains how a complex organism with specialized tissues and organs arises from a single zygote.
Practice Questions from this Chapter
Tap "Get Solution" on any question to ask our AI tutor.
- Explore plant growth without soil. Get Solution →
- Define "indeterminate growth" simply. Get Solution →
- Illustrate meristematic cell division. Get Solution →
- According to the text, how is growth fundamentally defined? Get Solution →
- What is the term for the unique form of plant growth where new cells are always being added by meristem activity? Get Solution →
- Which meristems are responsible for the primary growth of plants, contributing to their elongation? Get Solution →
- The increase in the girth of organs in dicotyledonous plants and gymnosperms is known as what? Get Solution →
- What are the three distinct phases of growth described in the chapter? Get Solution →
Did you know?
- 💡 A bamboo plant can grow over three feet in just 24 hours.
- 💡 The oldest living tree is over 5,000 years old and still slowly growing.
- 💡 Some plants 'eat' insects to get extra nutrients from their bodies.
- 💡 The world's largest seed is from a palm and weighs more than 40 pounds.
- 💡 Air plants grow without soil, getting all water and food from the air.
Frequently Asked Questions
How many topics are covered in this chapter?
This chapter covers 6 key topics: Characteristics of Plant Growth, Primary and Secondary Growth, Phases of Growth, Measurement of Growth, Growth Rates: Arithmetic Growth, and more. The BrainWeave AI tutor explains each one with examples.
Is Chapter 13: PLANT GROWTH AND DEVELOPMENT important for board exams?
Class 11 is a foundation year. Mastering this chapter now will help you build strong fundamentals for the higher classes.
Can I get NCERT solutions for this chapter in Hindi?
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