Biology Principles of Ecology

Ecology is the study of _____.

• the interaction between organisms and their environment
• living animals
• the interactions between living and dead organisms
• economics

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Each level in the ecological pyramid represents the transfer of energy between organisms.  The different layers of the pyramid are called _____.

• ecosystems
• niches
• trophic levels
• habitats

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What would happen to the numbers of organisms in the pyramid if producers were killed off?

• no change
• increase
• decrease
• increase then decrease

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A rabbit eats grass.  A snake eats the rabbit.  A hawk eats the snake.  This is an example of a(n) _____.

• energy pyramid
• symbiosis interaction
• food web
• food chain

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Which of the following is in the correct order from smallest to largest?

• population-community-biosphere-organism
• organism-population-community-ecosystem
• biosphere-ecosystem-community-population
• organism-community-population-ecosystem

Any close and permanent relationship between two species is called _____.

• parasitism
• commensalism
• symbiosis
• mutualism

As you go through a food chain, the amount of available energy _____.

• increases
• decreases
• decrease the increase
• stays the same

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Energy flows from ______.

• grasshopper to grass
• eagle to grass
• frog to snake
• snake to frog

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Which of the following converts nitrogen in the air into a form plants can use?

• bacteria
• lightening
• sunlight
• bacteria and lightening

Which of the following terms are most similar in meaning?

• producers and autotrophs
• autotrophs and heterotrophs
• carnivores and autotrophs
• decomposers and onmivores