Carbon cycle summary

Energy flow revision

Food chains, webs and pyramids

Food chains and pyramids

Food chains show us how energy is transfered from one organism to another by eating.

At each stage energy is wasted through heat loss, respiration, movement and decay. This explains why a pyramid of biomass gets smaller as you go up the levels.

Always start with the plant at the bottom of the pyramid!

Try some revision questions for food chains, webs and pyramids... click on the title!!!

GCSE Biology Food chains webs and pyramids

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Free range farming v Intensive farming

Intensive farming

Intensive farms generally take up a fairly small area of land, but aim to have a very high output, through massive inputs of capital and labour. These farms use machines and new technologies to become as efficient and cost-effective as possible - Less land needed / energy loss from movement and keeping warm reduced / rapid growth of live stock

Many Turkeys are intensively farmed ready for Christmas dinner!

Intensive agriculture can be seen in many places around the world, such as the Canterbury Plains of New Zealand, pig farming in Denmark and rice cultivation in the countries of South East Asia. All use technology appropriate to their country to enable them to get the highest yields from their land.

Carbon cycle

The Carbon Cycle


This is how carbon is 'recycled' in the environment. Carbon is used in a variety of compounds such as carbon dioxide (obviously!)and sugars as well as many others.



Try clicking on the title to take a short revision quiz on the carbon cycle.

GCSE Biology Nutrient cycle

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