CBSE Class 12 Biology Organisms and Populations Flow Charts

Official CBSE Study Materials for Class 12 Biology

Access comprehensive study materials and useful resources for Chapter 11 Organisms and Populations using the CBSE Class 12 Biology Organisms and Populations Flow Charts. Designed to align with the 2026-27 CBSE academic guidelines, these advanced resources help Class 12 Biology students reinforce core concepts beyond standard textbooks.

Advanced Resources for Biology

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CBSE Class 12 Biology Organisms and Populations Flow Charts. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

Biology: Chapter 13 – Organisms and Populations (Flow Charts)

1. Major biomes

Major biomesDesertGrasslandArctic andalpine tundraConiferousforestTemperateforestTropicalforest

2. Major biomes of India

Major biomes of IndiaTropical rainforestDeciduous forestDesertSea coast

3. Major abiotic factors affecting organisms

  • Temperature: Affects enzyme activity and hence physiological functions.
  • Water: The chemical composition and pH affect organisms. Salt concentration (salinity) varies from inland waters to hypersaline lagoons.
  • Light: Photosynthesis is affected by the intensity of light. Photoperiodic flowering. Foraging, reproductive and migratory activities depend on photoperiod. The quality (colour) of light reaching the deep oceans determines the distribution of algae.
  • Soil: Composition and grain size determine percolation and water holding capacity. pH, mineral composition and topography determine the vegetation and animals in the area.
Major abiotic factors affecting organismsTemperatureAffects enzyme activity, andhence physiological functionsWaterChemical composition and pHaffect organisms. Saltconcentration (salinity)varies from inland waters tohypersaline lagoonsLightPhotosynthesis is affected bythe intensity of light.Flowering is photoperiodic.Foraging, reproductive andmigratory activities dependon the photoperiod. Thequality (colour) of lightreaching the deep oceansdetermines the distributionof algaeSoilComposition and grain sizedetermine percolation andwater-holding capacity. pH,mineral composition andtopography determine thevegetation and animals in thearea

4. Responses to abiotic factors

  • Regulate: e.g. mammals (long term)
  • Conform: e.g. reptiles (long term)
  • Migrate: e.g. birds (short term)
  • Suspend: e.g. polar bears (short term)
Responses to abiotic factorsRegulatee.g. mammalsConforme.g. reptilesMigratee.g. birdsSuspende.g. hibernation inbears

5. Adaptations

AdaptationsMorphologicalPhysiologicalBehavioural

6. Population attributes

Attributes: Birth rate, Death rate, Age group, Sex ratio.

Population attributesBirth rateDeath rateAge distributionSex ratio

7. Factors affecting population size

Factors affecting population sizeNatality and immigration(increase the population)Mortality and emigration(decrease the population)

8. Population interactions

Population interactionsMutualisme.g. lichensCommensalisme.g. sea anemone andclown fishPredatione.g. lion and deerParasitisme.g. liver fluke andmanCompetitione.g. any twoherbivores for grassAmensalisme.g. bacteria thatproduce antibioticswhich kill othermicrobes

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Free study material for Biology

Biology Class 12 Exam Resources: Chapter 11 Organisms and Populations

Quick Revision Material for Chapter 11 Organisms and Populations

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Expert Notes and Solved Exam Questions

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FAQs

What is included in the advanced study material for Class 12 Biology Chapter 11 Organisms and Populations?

Our advanced study package for Chapter 11 Organisms and Populations includes detailed concepts, diagrams, Mind Maps, and explanation of complex topics to ensure Class 12 students learn as per syllabus for 2026 exams.

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The Mind Maps provided for Chapter 11 Organisms and Populations act as visual anchors which will help faster recall during high-pressure exams.

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Does this material cover rationalized content for the 2026-27 CBSE session?

Yes, our subject matter experts have updated the Chapter 11 Organisms and Populations material to align with the rationalized NCERT textbooks and have removed deleted topics and added new competency-based questions.