Cheat sheet · NEET Preparation Botany
Organisms and Populations cheat sheet
The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.
NEET · Botany
Cheat sheet
Class 12 · Chapter 11Organisms and Populations
Population growth: exponential (J-curve) vs logistic (S-curve).
1. Population Attributes
- Birth rate, death rate, sex ratio, age pyramids (expanding, stable, declining).
- Density changes by natality, immigration (+) and mortality, emigration (−).
2. Growth Models
(exponential)
(logistic)
K = carrying capacity; r = intrinsic rate of natural increase.
3. Interactions
| Interaction | Species A | Species B | Example |
|---|---|---|---|
| Mutualism | lichens, fig–wasp | ||
| Commensalism | 0 | orchid on mango, barnacles on whale | |
| Predation | − | tiger–deer | |
| Parasitism | − | Cuscuta, lice | |
| Competition | − | − | Balanus vs Chthamalus |
| Amensalism | 0 | − | Penicillium on bacteria |
4. Key Points
- Gause's competitive exclusion principle.
- Brood parasitism: cuckoo.
- Resource partitioning allows coexistence.
- Allen's rule: shorter limbs in cold climates.
Remember: Attributes | J vs S curve | interaction table
Organisms and Populations: questions and notes
More NEET Preparation Botany cheat sheets
- The Living World
- Biological Classification
- Plant Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Cell: The Unit of Life
- Cell Cycle and Cell Division
- Photosynthesis in Higher Plants
- Respiration in Plants
- Plant Growth and Development
- Sexual Reproduction in Flowering Plants
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Microbes in Human Welfare
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
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