Life Science Review

What is the primary source of energy used by producers during photosynthesis?

•  Thermal energy from the sun 
•  Light energy from the sun 
•  Chemical energy from food and oxygen 
• Chemical energy from carbon dioxide and water 

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What type of organisms provides the base for this food web?

•  Predators and prey
•  Autotrophs and decomposers
• Predators and decomposers

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What is the primary role of decomposers in an ecosystem?

• A.  To control the population of producers and consumers 
• To compete with producers for energy and other resources 
• A.  To provide a source of energy for the producers in the ecosystem 
• A.  To recycle energy and materials from dead producers and consumers 

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One relationship between organisms is that of predator-prey. Which of the following is the best description of a predator?

• An organism that eats another organism
• An organism that participates in symbiosis 
• An organism that is eaten by another organism 
• An organism that benefits at the expense of another organism

Which relationship is most likely to increase the population of one species in an ecosystem without affecting the population of its associated species?

• predation
• mutualism
• parasitism
• commensalism

The graph below shows the population of a group of rabbits in a restricted area studied over a period of 5 years. Which statement might explain why the population levels off as shown in the graph?  

• The resources in the area ran out. 
• Predators were introduced into the area
• The rabbits encountered a new disease
• Competition for resources limits the rabbit population

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What is the relationship between the primary and secondary consumers in the following web?

• Predator / Prey
•  Parasitism
•  Mutualism

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what is the amount of energy transferred from each level in the above illustration?

•  50%
• 100%
• 10%

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Which of the following statements best defines the law of conservation of mass?

• Mass cannot be created but it can be destroyed under extreme pressures
• Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost
• The mass of a closed system cannot change over time; mass cannot be created nor destroyed
• Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost

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Which pigment reflects orange, yellow, and red light and absorbs the other colors to provide energy for photosynthesis? 

• chlorophyll
• thylakoid
• carotenoids
• chloroplast

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