BIOLOGIC
INSIGHTS
⚡ NEET 2025 POPULATION DYNAMICS | NCERT BIOLOGY
ORGANISMS & POPULATION INTERACTIONS - Complete NEET Guide
15-Year NEET Trends Analysis + NCERT Based PYQs (2009-2024)
🌿 3 MUST-KNOW FACTS FOR NEET 2025
12
PYQs on Population Interactions
100%
Mutualism Qs from NCERT Examples
3x
More Predation Questions in Last 5 Years
🌍 ORGANISM & ENVIRONMENT - NEET NCERT Highlights
| Factor Type | Key Concept | NEET Example |
|---|---|---|
| Abiotic Factors | Temperature, Water, Light, Soil | Eurythermal vs Stenothermal (NEET 2020) |
| Biotic Factors | Interactions between organisms | Predator-Prey dynamics (NEET 2021) |
| Adaptations | Morphological, Physiological, Behavioral | Camel's water conservation (NEET 2019) |
NEET 2025 Tip: Remember key adaptations - Desert plants (CAM pathway), Aquatic plants (aerenchyma), Altitude adaptations (increased RBC count)
🤝 MUTUALISM
- Definition: Both species benefit (+/+ interaction)
- NEET Examples: Lichens (Algae+Fungi), Rhizobium+Legumes
- Special Cases: Mycorrhizae, Pollination mutualisms
- NEET Focus: Fig-wasp mutualism (NEET 2018, 2022)
🥊 COMPETITION
- Types: Intraspecific vs Interspecific
- Gause's Principle: Competitive exclusion
- Resource Partitioning: MacArthur's warblers
- NEET Favorite: Competitive release (NEET 2020)
🦁 PREDATION
- Definition: One benefits, other harmed (+/- interaction)
- Adaptations: Camouflage, Chemical defenses
- NEET Examples: Cryptic coloration in moths
- Importance: Controls prey populations
🦠 PARASITISM
- Types: Ectoparasites vs Endoparasites
- NEET Examples: Cuscuta, Plasmodium
- Host Defenses: Immune response
- Brood Parasitism: Cuckoo-Crow (NEET 2021)
📊 POPULATION ATTRIBUTES
Growth Patterns
- Exponential Growth: J-shaped curve (ideal conditions)
- Logistic Growth: S-shaped curve (carrying capacity)
- NEET Example: Bacterial growth in lab (NEET 2019)
Vital Statistics
- Birth Rate: Natality per 1000 individuals
- Death Rate: Mortality per 1000 individuals
- Age Distribution: Pyramids (expanding, stable, declining)
- NEET Special: Human population growth (NEET 2020)
NEET Special: Remember r-selected (many offspring, low care) vs K-selected (few offspring, high care) species - frequently asked
📜 NEET PYQ TRENDS (2014-2024)
2023: Which is NOT an example of mutualism?
Cuckoo laying eggs in crow's nest (Correct Answer)
2021: What type of population interaction is shown by orchid growing on mango tree?
Commensalism (NCERT based)
2019: Which adaptation helps camel survive in desert?
Concentrated urine (Direct NCERT line)
