and do not depend on any other organism for nutrition. Primary Consumers Herbivores that eat producers Deer, mice, fish Secondary Consumers Eat primary consumers Snake eating a mouse Tertiary Consumer Eat secondary consumers Eagle preying on the snake Organism that only eats Herbivore sheep producers Organism that eats producers Omnivore humans and other animals Organism that only eats other Carnivore Lions animals Make up the last part of food scavengers such as vultures chains, organisms that eat Detritivore eat dead animals. Dung nonliving and animal beetles eat animal feces. remains. Turn organic wastes, such as decaying plants, into inorganic materials, such as Decomposers nutrient-rich soil. They fungi and bacteria complete the cycle of life, returning nutrients to the soil or oceans Niches Each species in a habitat has its own role to play. Its role includes its general behaviour and its effect on the habitat and other organisms living there. The term used to describe this role is niche. Energy Flow At each link in a food web 90% of the energy is lost, so the organism next in the chain only gains 10%. Energy can be lost from a food web in different ways: Wasted as undigested food (faeces) Used by the organism for heat and movement 2 - Population Growth
and do not depend on any other organism for nutrition. Primary Consumers Herbivores that eat producers Deer, mice, fish Secondary Consumers Eat primary consumers Snake eating a mouse Tertiary Consumer Eat secondary consumers Eagle preying on the snake Herbivore Organism that only eats producers sheep Omnivore Organism that eats producers and other animals humans Carnivore Organism that only eats other animals Lions Detritivore Make up the last part of food chains, organisms that eat nonliving and animal remains. scavengers such as vultures eat dead animals. Dung beetles eat animal feces. Decomposers Turn organic wastes, such as decaying plants, into inorganic materials, such as nutrient-rich soil. They complete the cycle of life, returning nutrients to the soil or oceans fungi and bacteria Niches Each species in a habitat has its own role to play. Its role includes its general behaviour and its effect on the habitat and other organisms living there. The term used to describe this role is niche. Energy Flow At each link in a food web 90% of the energy is lost, so the organism next in the chain only gains 10%. Energy can be lost from a food web in different ways: Wasted as undigested food (faeces) Used by the organism for heat and movement 2 - Population Growth
National-5-Environmental-Science-Unit-1-Notes.docx