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Q2:
Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?
Solution :
1. Theoretical Foundation: Defining Growth
In biological systems, growth is defined as an irreversible permanent increase in size of an organ or its parts, or even of an individual cell. Growth is an open-ended process in plants, exhibiting unique characteristics such as indeterminate growth and varying physiological responses across different developmental stages [Per the Principles of Plant Physiology].
2. Parameters of Growth Measurement
To quantify growth, researchers utilize various measurable parameters, including:
- Increase in fresh or dry weight: Reflects the accumulation of biomass.
- Increase in length or surface area: Measures elongation (e.g., in stems and roots) or expansion (e.g., in leaves).
- Increase in cell number/volume: Measures mitotic proliferation.
3. Limitations of Single-Parameter Assessment
No single parameter can serve as a universal metric because growth dynamics shift fundamentally across the life cycle of a flowering plant. The reasons are as follows:
| Parameter | Applicability | Constraint |
|---|---|---|
| Increase in Length | Suitable for root/shoot elongation (Apical dominance). | Fails to account for radial thickening (Secondary growth) or fruit expansion. |
| Increase in Cell Number | Highly accurate for unicellular organisms or early embryonic stages. | Becomes computationally impractical and biologically less significant in mature tissues where expansion outweighs division. |
| Increase in Fresh Weight | Easy to measure in field conditions. | Highly volatile due to fluctuations in water content (turgor pressure), which does not always equate to structural growth. |
| Increase in Dry Weight | The most accurate indicator of real biological "gain." | Destructive; the plant cannot be measured multiple times throughout its life, preventing longitudinal study of the same specimen. |
4. Comparative Visual Representation of Growth Dynamics
5. Justification: Physiological Heterogeneity
A plant’s life cycle encompasses distinct developmental phases: germination, vegetative growth, flowering, and senescence. During germination, cell volume expansion is the dominant growth driver due to water imbibition. During vegetative development, cell division (mitosis) in meristematic zones is primary. In reproductive phases, biomass accumulation in seeds or fruits becomes the metabolic priority [Reference: Sachs' Model of Plant Growth]. Because these processes are not synchronized, applying a single measuring rod would result in systemic underestimation of growth activity in specific plant tissues.
Final Solution: No single parameter is sufficient because growth is a multi-dimensional phenomenon where different physiological processes—such as cell division, cell elongation, and biomass accumulation—occur at varying rates and in different anatomical regions throughout the plant's life cycle. Relying on one metric (e.g., length) ignores structural shifts (e.g., secondary thickening), while another (e.g., dry weight) is often destructive, necessitating a multi-parametric approach for accurate developmental assessment.
More Questions from Class 11 Biology Plant Growth and Development EXERCISES
- Q1: Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.
- Q3(a): Describe briefly: (a) Arithmetic growth
- Q3(b): Describe briefly: (b) Geometric growth
- Q3(c): Describe briefly: (c) Sigmoid growth curve
- Q3(d): Describe briefly: (d) Absolute and relative growth rates
- Q4: List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
- Q5: Why is abscisic acid also known as stress hormone?
- Q6: ‘Both growth and differentiation in higher plants are open’. Comment.
- Q7: ‘Both a short day plant and a long day plant can produce can flower simultaneously in a given place’. Explain.
- Q8(a): Which one of the plant growth regulators would you use if you are asked to: (a) induce rooting in a twig
- Q8(b): Which one of the plant growth regulators would you use if you are asked to: (b) quickly ripen a fruit
- Q8(c): Which one of the plant growth regulators would you use if you are asked to: (c) delay leaf senescence
- Q8(d): Which one of the plant growth regulators would you use if you are asked to: (d) induce growth in axillary buds
- Q8(e): Which one of the plant growth regulators would you use if you are asked to: (e) ‘bolt’ a rosette plant
- Q8(f): Which one of the plant growth regulators would you use if you are asked to: (f) induce immediate stomatal closure in leaves.
- Q9: Would a defoliated plant respond to photoperiodic cycle? Why?
- Q10(a): What would be expected to happen if: (a) $GA_3$ is applied to rice seedlings
- Q10(b): What would be expected to happen if: (b) dividing cells stop differentiating
- Q10(c): What would be expected to happen if: (c) a rotten fruit gets mixed with unripe fruits
- Q10(d): What would be expected to happen if: (d) you forget to add cytokinin to the culture medium.
CBSE Solutions for Class 11 Biology Plant Growth and Development
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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