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Organisms and Populations

ICSE · Class 12 · Biology

Complete topic list for Organisms and Populations in ICSE Class 12 Biology. Key concepts, sub-topics, and what to focus on for board exams.

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An illustration showcasing various examples of commensalistic relationships, such as an orchid on a mango branch, barnacles on a whale, and cattle egret with grazing cattle.
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4 Topics · ICSE Class 12 Biology

Topics in Organisms and Populations

1

  • Ecology: from Greek oikos (house) + logos (study). Study of interactions among organisms and between organisms and environment
  • Term first used by Henry David Thoreau (1858); formalised by Ernst Haeckel (1886)
  • Father of Indian Ecology: Ramdeo Misra
2

  • Population: group of individuals of the same species living in a defined area at a given time, sharing a common gene pool
  • Population density (N): number of individuals per unit area/volume; can be measured by counting, quadrat method, mark-recapture
  • Natality (birth rate, b): rate of addition of new individuals to a population
3

  • Age pyramid: diagrammatic representation of proportions of pre-reproductive, reproductive, and post-reproductive age groups
  • Three age classes: pre-reproductive (0-14 yrs), reproductive (15-44 yrs), post-reproductive (45+ yrs)
  • Expanding (growing) population: broad base (many young), triangular pyramid — indicates rapid growth
4

  • Exponential growth (J-curve): unlimited resources; equation: dN/dt = rN; r = intrinsic rate of natural increase (b − d)
  • Also written as Nt = N0 × e^(rt) where e = Euler's number (2.71828)
  • Logistic growth (S-curve/sigmoid): limited resources; equation: dN/dt = rN × [(K−N)/K]

Chapter Syllabus

Organisms and Populations is part of the ICSE Class 12 Biology syllabus. It covers the core concepts and topics prescribed by the board for the 2026 academic year.

Frequently Asked Questions

What are the important topics in Organisms and Populations for ICSE Class 12 Biology?
Key topics in Organisms and Populations include Population Growth Models Comparison, Population Interactions Summary Table, Population Attributes and Measurement Methods. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Organisms and Populations — ICSE Class 12 Biology?
Understand the core concepts first, then work through the 60 practice questions available for this chapter. Revise formulas and 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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