Ch 13 - Plant Growth and Development11th Biology
Plant Growth: Definition & Nature
How is 'growth' scientifically defined in plants, and why is plant growth considered 'indeterminate'?
How is 'growth' scientifically defined in plants, and why is plant growth considered 'indeterminate'?
- Definition: Growth is an irreversible, permanent increase in the size of an organ, its parts, or an individual cell.
- Indeterminate Nature: Plants retain the capacity for unlimited growth throughout their life.
- Reason: This is strictly due to the presence of meristems (cells with the capacity to divide and self-perpetuate) at specific locations in their body.
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Open Form of Growth
What is meant by the 'open form of growth' in plants?
What is meant by the 'open form of growth' in plants?
- The open form of growth refers to the phenomenon where new cells are continuously being added to the plant body by the active division of meristems.
- Once a cell is produced by the meristem, it eventually loses its capacity to divide and differentiates to make up the mature plant body.
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Primary vs. Secondary Growth
What are the specific meristems responsible for primary and secondary growth, and what are their respective functions?
What are the specific meristems responsible for primary and secondary growth, and what are their respective functions?
- Primary Growth: Driven by the Root Apical Meristem and Shoot Apical Meristem. It principally contributes to the elongation of the plant along its axis.
- Secondary Growth: Driven by Lateral Meristems (Vascular cambium and Cork cambium). It causes an increase in the girth (thickness) of the organs. Found primarily in dicotyledonous plants and gymnosperms.
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Also in this chapter
50 more cards to study in Prism
- 4Measurability of Growth
- 5Meristematic Phase of Growth
- 6Elongation vs. Maturation Phases
- 7Arithmetic Growth
- 8Arithmetic Growth Formula
- 9Geometric Growth (Sigmoid Curve)
- 10Geometric Growth Formula
- 11Absolute vs. Relative Growth Rate
- 12Essential Conditions for Growth
- 13Differentiation
- 14Open Differentiation
- 15Dedifferentiation
- 16Redifferentiation
- 17Plasticity & Heterophylly
- 18Etiolation
- 19PGR Categories
- 20Discovery of Auxins
- 21Types of Auxins
- 22Discovery of Gibberellins
- 23Discovery of Cytokinins
- 24Discovery of Ethylene
- 25Discovery of Abscisic Acid (ABA)
- 26Auxin Bioassay
- 27Apical Dominance
- 28Agricultural Applications of Auxins
- 29Gibberellins Overview
- 30Physiological Effects of Gibberellins
- 31Bolting Effect
- 32Cytokinins: Synthesis & Function
- 33Delay of Leaf Senescence (Richmond-Lang Effect)
- 34Ethylene: The Gaseous Hormone
- 35Triple Response of Ethylene
- 36Epinasty
- 37Respiratory Climacteric
- 38Ethylene in Sprouting & Germination
- 39Agricultural Applications of Ethephon
- 40Abscisic Acid (The Stress Hormone)
- 41ABA and Seed Dormancy
- 42PGR Antagonism and Synergism
- 43Bioassays for Gibberellins and Cytokinins
- 44Categories of Photoperiodism
- 45Plant Development Equation
- 46Perception of Photoperiod & Florigen
- 47Vernalization Concept
- 48Site of Vernalization Perception
- 49Devernalization & Hormone Substitution
- 50Internal Causes of Seed Dormancy
- 51Breaking Seed Dormancy
- 52Vivipary
- 53Relative Growth Rate (RGR)
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