Environmental Systems SBA #1 Review

What is a dichotomous key?

• 
  A tool used in psychology to measure personality traits based on binary choices.

• A tool used in biology to identify organisms based on a series of choices between two alternative characteristics

• A tool used in mathematics to solve equations with two variables.

• A tool used in chemistry to identify elements based on their atomic number.

How does a dichotomous key help in identifying organisms?

• By providing a list of common names for organisms.

• 
  By using DNA analysis to identify organisms.

• 
  By categorizing organisms based on their size.

• By providing a series of choices between two alternative characteristics.

Based on the information in the dichotomous key pictured, which rock sample can be identified as obsidian?

• Rock B

• Rock C

• Rock D

• Rock E

Use the dichotomous key pictured to identify leaf H.

• Pine

• Magnolia

• Holly

• Walnut

What is a food web and how is it different from a food chain?

• A food web is a linear sequence of organisms, while a food chain is a network of interconnected food chains.

• A food web is a network of interconnected food chains, while a food chain is a linear sequence of organisms.

• 
  A food web represents the flow of energy in an ecosystem, while a food chain represents the flow of matter.

• 
  A food web consists of only producers, while a food chain consists of only consumers.

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In the food chain pictured, which organism gets its energy from the python?

• grassq

• grasshopper

• frog

• eagle

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Which of the organisms below is a producer in the food web pictured?

• grass

• kangaroo rat

• rattlesnake

• bacteria

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Which of the organisms below is a primary consumer in the food web pictured?

• tuna

• dogfish

• plankton

• krill

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Which of the organisms below is a secondary consumer in the food web pictured?

• bird

• hawk

• deer

• mountain lion

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Which of the organisms below is a tertiary consumer in the food web pictured?

• berries

• rabbit

• fox

• frog

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