Скачать или смотреть GCSE Biology - Trophic Levels - Producers, Consumers, Herbivores & Carnivores (2026/27 exams)

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** WHAT'S COVERED **
1. Trophic Levels in Food Chains
Producers (Trophic Level 1).
Primary Consumers / Herbivores (Trophic Level 2).
Secondary Consumers / Carnivores (Trophic Level 3).
Tertiary Consumers / Carnivores (Trophic Level 4).
2. Energy Transfer Between Trophic Levels
How energy is lost moving up the food chain.
The 10% rule for energy transfer efficiency.
Explanation for the limited length of food chains.
3. Specific Roles in Ecosystems
Apex Predators at the top of the food chain.
Omnivores and their position in trophic levels.
Decomposers and Detritivores role in nutrient recycling.

** EXAM BOARD INFO **
AQA - Separate/triple science only
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only

** CHAPTERS **
0:00 Introduction to Trophic Levels
0:28 Trophic Level 1: Producers
0:49 Trophic Level 2: Primary Consumers (Herbivores)
1:11 Trophic Level 3: Secondary Consumers (Carnivores)
1:25 Trophic Level 4: Tertiary Consumers (Carnivores)
1:42 Limits to Food Chain Length
1:53 Energy Loss Between Levels (10% Rule)
2:36 Apex Predators
2:49 Omnivores
3:17 Decomposers & Detritivores

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