Clip description Keywords
Energy in food chains
Energy in food chains

Duration: 02:51

A brief introduction to terms involved in ecosystems and an explanation of how all energy in food chains comes from the Sun.

 
Energy transfers and food chains (pt 1/2)
Energy transfers and food chains (pt 1/2)

Duration: 02:05

Demonstrates the transfer of energy from the Sun to plants by photosynthesis and then up a simple food chain.

 
Energy transfers and food chains (pt 2/2)
Energy transfers and food chains (pt 2/2)

Duration: 01:45

An investigation into the efficiency of energy transfers through a food web or food chain.

 
Energy values of food
Energy values of food

Duration: 02:09

Food energy values and human energy requirements are explained.

 
Food and energy
Food and energy

Duration: 03:09

An investigation into the food energy needs for different activities. How is a high energy-to-weight ratio achieved by a polar explorer?

 
Food chains - pyramid of numbers
Food chains - pyramid of numbers

Duration: 01:16

A pyramid of numbers is explained in terms of a food chain.

 
Food chains and food webs
Food chains and food webs

Duration: 01:58

Examples of simple food webs and food chains are shown. Population changes and their effects on food webs are discussed.

 
Pesticides and the food chain
Pesticides and the food chain

Duration: 02:17

An introduction to pesticides and how they affect the whole food web of interlinking food chains.

 
Predator-prey relationships - barn owls
Predator-prey relationships - barn owls

Duration: 03:42

An investigation into predator-prey relationships and why the barn owl population is declining.

 
Respiration in horses
Respiration in horses

Duration: 03:57

An investigation into race horse respiration and the amount of energy contained in their food. subtitled

 
What happens to energy in food chains?
What happens to energy in food chains?

Duration: 03:37

An investigation into what happens to the energy which is not passed on to the next trophic level in a food chain.

 

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