Ecology Practice Quiz

Which of the fallowing has only abiotic factors?

• Sunlight, algae, and temperature
• Guppy, crab, oxygen
• Sunlight, soil, and weather
• Algae, temperature, and dog

In population ecology, one of the factors that is studied is a density-dependent factor. Density-dependent factors have the greatest effect on dense populations and little or no effect on very sparse populations. What would NOT be an example of a density-dependent factors?

• Parasitism

• Predation

• The average rainfall of a region

• Communicable disease

The carrying capacity of the water flea Daphnia in a laboratory culture medium is 130/mL. A research adds a fixed amount of nutrients to the medium every day to maintain their concentration. The research decides to increase the amount of nutrients that are added daily to the culture. How will this increase impact the carrying capacity of Daphnia in the medium?

• The carrying capacity will remain unchanged

• The carrying capacity will decrease

• The carrying capacity will decrease and then become constant

• They carrying capacity will increase

Which terms best describe heterotrophs?

• Plants; producers
• Animals; producers
• Plants; consumers
• Animals; consumers

Refer to the food web shown in the figure. Which organism is correctly classified as a primary consumer?

• Grasses

• Frog

• Snake

• Grasshopper

This food chain can be found in the coastal waters of Virginia. The population of which organisms in the food chain would be the first to decline if commercial fishing over-harvested shrimp?

• Algae

• Damselfish

• Zooplankton

• Barracuda

The figure shown displays the biomass within a food pyramid. How much energy is most likely available at the grasshoppers' trophic level?

• 1,000 kg

• 900 kg

• 9,000 kg

• 10 kg

Wild pigs eat leaves, plant roots, flowers, lizards, and snakes. They are classified as...

• producers

• omnivores

• herbivores

• scavengers

What are examples of pioneer species in a primary succession?

• Bushes and Shrubs
• Oak trees
• Mossess and Lichens 
• A rose Bush

The nitrogen found in the atmosphere is not in a form that plants and animals can use. What converts the nitrogen into a useable form?

• Photosynthesis

• Decomposition of organisms

• Fungi

• Bacteria