Life Sci. St. 1 and 4

1. Which of the following types of organisms would benefit most directly from the products of decomposer organisms? A)the decomposers themselves B)the primary consumers C)the secondary consumers D)the producers 

• the decomposers themselves  
• )the primary consumers
• the secondary consumers 
• the producers 

Which statement is true about the relationship between bacteria and humans?

• All bacteria are harmful to humans
• Some bacteria are harmful to humans and other bacteria are helpful.
• All bacteria are helpful to humans
• Bacteria are neither helpful nor harmful to 

 Which food is made with the help of bacteria

• yogurt
• soda
• bread
• vinegar

Oxygen is released into the air by

• Sun
• animals
• volcanoes
• plants

 The diagram below shows a food web. Which population of organisms would MOST LIKELY increase if there were fewer grasshoppers?

• snakes
• hawks
• mice
• kookaburra

 The diagram shows relationships between organisms in a food web. What do the arrows in the diagram represent?

• the location and movement of organisms within the food web 
• which organisms are most closely related within the food web 
• the movement of carbon dioxide through the organisms in a food web
• the transfer of matter and energy through the organisms in a food web

Jenna's class studied a forest food web. Which of these organisms can BEST turn dead plant and animal matter into substances that can be reused by the ecosystem? 

• bacteria
• birds
• mice
• plants

 Which of these BEST explains why predators need plants, such as grass, in their ecosystems? 

• Plants are a large part of their diets
• Plants provide safety for the predators
• Plants break down the organisms that the predators eat
• Plants provide food for the animals that the predators eat

Absent-minded Ernie has taken his field notebook to a prairie ecosystem. Ernie was supposed to have totaled up the number of producers, first-order consumers, second-order consumers, and third-order consumers present. Ernie DID record the NUMBER of species he saw along with some examples, but he accidentally erased their categories. Help Ernie classify these by line.
Line 1: ________________; 1 species; mountain lion
Line 2: ________________; 27 species; prairie grass
Line 3: ________________; 7 species; field mice
Line 4: ________________; 3 species; skunks In this order, what did Ernie see?

• )producers, third-order consumers, second-order consumers, first-order consumers 
• second-order consumers, producers, third-order consumers, first-order consumers
• )first-order consumers, producers, second-order consumers, third-order consumers
• third-order consumers, producers, first-order consumers, second-order consumers