Cambridge IGCSE Combined Science, topic 15
Organisms and their environment
Organisms do not live alone. They depend on energy from the Sun and on each other for food. This topic looks at how energy flows through ecosystems along food chains and food webs, how carbon is cycled, and what populations, communities and ecosystems are.
Revision notes
Worksheet
FlashcardsSubtopics
Work through them in order. Each one has notes, exam questions and flashcards, and a PDF of each. Subtopics that are not in 0653 are left out.
- 1Energy flow, food chains and food webs Spec B15.1, B15.2How energy flows from the Sun through producers, consumers and decomposers to the environment, and how food chains and webs show feeding links.NotesQuestions 7Flashcards 13
- 2Nutrient cycles Spec B15.3How carbon is cycled between the air, living things and fossil fuels by photosynthesis, feeding, respiration, decomposition and combustion.NotesQuestions 3Flashcards 4
- 3Populations Spec B16.1What populations, communities and ecosystems are, using a pond as the example.NotesQuestions 1Flashcards 1
Not in Cambridge IGCSE Combined Science: Trophic levels and ecological pyramids.
Whole topic
When you have done the subtopics: test yourself on everything, or print the lot.