Organisms and Populations
NCERT Class 12 Biology Chapter 11
Organisms and Populations for Class 12 Biology and NEET: population attributes, exponential and logistic growth, predation, competition and mutualism.
1 topic Updated 8 Nov 2026
In the syllabus: NEET Class 12 syllabus
With your textbook
NCERT Biology (Class 12), Chapter 11 “Organisms and Populations”, reprint 2026-27.
Open the official NCERT chapter (PDF, 1.6 MB, ncert.nic.in) (opens in a new tab)
Checked on 19 Oct 2026.
Learn in this order
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Populations: attributes, growth and interactions
Organisms and populations for Class 12 Biology and NEET: birth and death rates, age pyramids, exponential and logistic growth and the six interactions.
Key formulas in this chapter
Populations
- change in N = (B + I) − (D + E)
- dN/dt = rN, where r = b − d
- Nt = N0 ert
- dN/dt = rN (K − N)/K
- doubling time T: r = ln 2 / T
More in 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 Cell Division
- Photosynthesis in Higher Plants
- Respiration in Plants
- Plant Growth and Development
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Their Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
- Sexual Reproduction in Flowering Plants
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Ecosystem
- Biodiversity and Conservation