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Bio 20 Im studying for my bio final and i need help on this question.?
Grass>Grasshoppers>Mice>Snakes
a) Describe the relative numbers of producers, primary consumers, secondary consumers, and tertiary consumers expected in an ecosystem based on the food chain.
b) Describe the shape that this pyramid of numbers would take.
c)If you were to include decomposers in the food chain above, where would you place them? Explain your answer.
3 Answers
- JazSincLv 72 years agoFavorite Answer
a) Your teacher wants you to use the ecological / trophic "rule of 10%" which in this case would give you
1 snake (tertiary consumer)
10 mice (secondary consumer)
100 grasshoppers (primary consumer)
1000 grass (producer)
b) It's shaped like a pyramid, duh
c) decomposers go at every consumer level and also one step above your apex, so you would have decomposers at primary consumer,. secondary consumer, tertiary consumer, and quaternary consumer. Decomposers decompose dead organic matter, no matter its source.
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Again, real world: mice aren't insectivores and don't feast on grasshoppers, making this question bogus from the get-go.
A large grass plant can support more than one grasshopper. The "pyramid" is bollixed.
Pyramids fail so much that I don't know why this bogus concept is even taught. Your textbook, and teacher, suck.
- Anonymous2 years ago
Why don't you just pay someone to take your final for you? You obviously haven't studied at all.
