Ecology practice 1 2020

An ecologist performed a study to determine how the rate of photosynthetic activity in a lake changed from month to month.  The results of the study are shown in the graph.
Which conclusion is BEST supported by the evidence?

• photosynthetic organisms were dormant during the months of April through August
• the rate of photosynthesis increased from June through December
• the rate of photosynthesis was greatest during the months of May through June
• photosynthetic organisms experienced a die-off during the months of January through June

An energy pyramid is shown.
Which BEST explains why a pyramid is used to represent energy flow within an ecosystem?

• available energy increases when moving up an energy pyramid
• available energy decreases when moving up an energy pyramid
• the size of organisms decreases when moving up an energy pyramid
• the population size of the organisms increases moving up an energy pyramid

A food web is diagrammed.
What would MOST likely happen if the rabbit population decreased as a result  of another predator being introduced to the food web?

• the fox population would decrease
• the food web would not be affected
• the bird population would increase
• the spider population would decrease

The following diagram represents a food pyramid.
Which trophic level has the GREATEST total amount of energy to transfer to the next level?

• grain
• mouse
• snake
• hawk

An energy pyramid is shown.
Which organism receives the LEAST amount of energy from the producer?

• whales
• seals
• herring
• krill

The diagram below shows the cycling of nutrients in an ecosystem.
The removal of which of the following groups would cause an immediate decrease in the amount of energy flowing through the system?

• Producers
• Consumers
• Decomposers
• Inorganic nutrients

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3

What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

which symbiosis is this 

• parasitism 
• mutualism
• commensalism
• nonalism 

Tags

NGSS.MS-LS2-2

symbiotic relationship in which both organisms benefit

• competition
• Mutualism
• nitrogen fixation
• energy pyramid

Tags

NGSS.MS-LS2-2

The energy at each trophic level in the pryamid of energy decreases by a factor of ____.

• 10
• 1
• 100
• 2

Tags

NGSS.MS-LS2-3