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LoE - Ecosystems

Life on Earth - Topic 1 - Definitions & Food chains/webs/pyramids

QuestionAnswer
Define biodiversity. The variety and abundance of living things
Define habitat. The place where an organism lives
Define niche. The role an organism plays in its community
Define ecosystem. The living and non-living parts of the environment
Define population. The total number of one species living in an area
Define community. All the animals and plants living together
Define biome. A large ecosystem distinguished by its flora, fauna and climate
Define producer. An organism that can make its own food
Define consumer. An organism that eats another organism for energy
Define herbivore. An organism that eats only plants
Define carnivore. An organism that eats only animals (meat)
Define omnivore. An organism that eats both plants and animals
Define interspecific competition. Competition between organisms of different species for similar resources
Define intraspecific competition. Competition between organisms of the same species for the same resources
Define indicator species. A species whose presence or absence indicates the level of pollution in the environment.
What type of organism is always at the start of a food chain? Producer
What type of consumer eats the producer? Primary consumer
What type of consumer eats the primary consumer? Secondary consumer
What type of consumer eats the secondary consumer? Tertiary consumer
What do the arrows in a food chain represent? The direction of energy flow
What percentage of energy is passed on at each stage of the food chain? 10%
What percentage of energy is lost at each stage of the food chain? 90%
Name 3 ways energy can be lost in a food chain. heat, movement, undigested material
Describe a 'pyramid of biomass'. A diagram that shows the total mass of organisms at each stage of the food chain.
Describe a 'pyramid of energy'. A diagram that shows the total energy received by organisms at each stage of the food chain.
Describe a 'pyramid of numbers'. A diagram that shows the total number of organisms at each stage of the food chain.
If a pyramid of numbers is 'skinny' at the bottom, what does the food chain start with? A tree
If a pyramid of numbers is 'big' at the top, what does the food chain end with? Flea, insect or mite
Created by: StNiniansHS