Food Chain, Food Web and Pyramid of Numbers (Leaving Cert Biology): Flashcards
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Food chain definition
Food chain definition
A sequence of organisms where each is eaten by the next
Trophic level
Trophic level
Feeding stage in a food chain
Energy lost at each trophic level (%)
Energy lost at each trophic level (%)
90%
Energy passed to next level (%)
Energy passed to next level (%)
10%
Why are food chains short
Why are food chains short
Energy decreases at each level; only 10% passed on
Food web definition
Food web definition
Series of interconnected food chains
Pyramid of numbers
Pyramid of numbers
Diagram showing organism numbers at each trophic level
Bar length in pyramid of numbers shows
Bar length in pyramid of numbers shows
Relative number of organisms
Organism size trend moving up pyramid
Organism size trend moving up pyramid
Usually increases
Pyramid of numbers limitation: individual organism ___
Pyramid of numbers limitation: individual organism ___
Size not taken into account
Pyramid of numbers scale problem
Pyramid of numbers scale problem
Not to scale due to very large numbers
Niche definition
Niche definition
Functional role of organism in ecosystem or habitat
Can 2 organisms occupy same niche?
Can 2 organisms occupy same niche?
No, not without competing