Chapter 7 of 41
Revision Notes
Growth and Development in Plants — Revision Notes
Telangana Open School (TOSS) · Class 12 · Biology
Growth and Development in Plants revision notes for Telangana Open School (TOSS) Class 12 Biology: 4 topics in quick points.
43 questions35 flashcards5 concepts
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Key Topics to Revise
1
Growth and Development
- Growth is an irreversible increase in size, number, or volume of cells, organs, or the whole plant.
- Development includes all qualitative and quantitative changes from seed to death, including growth, differentiation, and maturation.
- Growth occurs in three stages: cell division, cell enlargement, and cell differentiation.
2
Plant Growth Curve and Measurement
- Sigmoid growth curve has three phases: Lag (slow), Log (rapid), and Stationary (plateau).
- Grand period of growth is the time during which growth is fastest.
- Growth can be measured in length, area, volume, or number of cells.
3
Factors Affecting Plant Growth
- External factors: Light, temperature, water, and mineral nutrients.
- Internal factors: Plant hormones (auxin, gibberellins, cytokinins, ethylene, abscisic acid).
- Light is essential for photosynthesis and photoperiodism.
4
Plant Growth Regulators (Hormones)
- Five major types: Auxin, Gibberellins, Cytokinins, Ethylene, Abscisic acid.
- Auxin (IAA): Promotes cell elongation, apical dominance, prevents fruit drop.
- Gibberellins: Promote stem elongation, break seed dormancy, induce parthenocarpy.
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Full NotesKey Concepts
Growth refers to an irreversible increaseCellular growth occurs in three stagesA graph showing plant growth overChemicals produced in small amountsGermination is the revival of metabolic
Frequently Asked Questions
What are the important topics in Growth and Development in Plants for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Growth and Development in Plants include Growth and Development, Plant Growth Curve and Measurement, Factors Affecting Plant Growth, Plant Growth Regulators (Hormones). Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Growth and Development in Plants for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 43 practice questions on Growth and Development in Plants. 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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