Monday, June 29, 2009



Friday, June 19, 2009

What are Food Chains and Food Webs

What are Food Chains and Food Webs

What are Food Chains and Food Webs

What are Food Chains and Food Webs: "Herbivore - an animal that eats plants. (See photos)
Carnivore - an animal that eats other animals. (See photos)
Omnivore - an animal that eats both plants and animals eg bears and humans. (See photos)
Producer - usually a green plant that produces its own food by photosynthesis
Primary Consumer - Animals that consume only plant matter. They are herbivores - eg rabbits, caterpillars, cows, sheep, and deer.
Secondary Consumer - Animals that eat primary consumers (herbivores).
Tertiary Consumer - Animals that eat secondary consumers ie carnivores that feed on other carnivores.
Predators - kill for food. They are either secondary or tertiary consumers - eg polar bears, golden eagles
Prey - are the organisms that predators feed on. Examples of predator and prey species are: fox and rabbit; blue tit and caterpillar; wolf and lamb
Scavenger - a consumer that eats dead animals (e.g. crab, crow, vulture, buzzard and hyena. )
Detritivore - a consumer that obtains its nutrients from detritus
Decomposer - an organism such as bacteria and fungi that breaks down dead organisms and their wastes. . (They do not 'eat' the food like scavengers, as they have no mouth-parts. Instead they break down solid matter into liquids which they can absorb.) Examples: bacteria and some fungi. (See photos)
Trophic Level - A trophic level is each level in a food chain. Matter is always 'lost' as heat energy at each trophic level. Basal Energy Requirement (B.E.R.) - the amount of energy used by an organism's body just to keep alive, when no food is being digested and no muscular work is being done."

Friday, March 27, 2009

Photosynthesis Process