Environmental Science (Midterm)

What is the primary source of carbon for the carbon cycle?

• Photosynthesis

• Volcanic eruptions

• Combustion of fossil fuels

• Nitrogen fixation

Which biogeochemical cycle is primarily responsible for atmospheric nitrogen fixation?

• Carbon Cycle

• Oxygen Cycle

• Nitrogen Cycle

• Hydrologic Cycle

What is the correct sequence of trophic levels in an ecological food pyramid, from the base to the top?

• Primary consumers, secondary consumers, producers, decomposers

• Producers, primary consumers, secondary consumers, decomposers

• Producers, secondary consumers, primary consumers, decomposers

• Primary consumers, producers, secondary consumers, decomposers

Which term best describes an organism that feeds on dead and decaying organic matter?

• Herbivore

• Carnivore

• Decomposer

• Producer

In a food web, what do arrows represent?

• Energy Flow

• Competition

• Predation

• Mutualism

What type of ecological relationship occurs when one organism benefits, and the other is neither harmed nor helped?

• Predation

• Mutualism

• Commensalism

• Parasitism

Which of the following is an example of mutualism?

• Lion hunting a zebra

• Bee collecting nectar from flowers

• Tick feeding on a dog's blood

• Cattle egret eating insects disturbed by cattle

The relationship between a tapeworm and the human host, where the tapeworm benefits but the human is harmed, is an example of:

• Commensalism

• Mutualism

• Parasitism

• Amensalism

Which of the following is a producer?

• Rabbit

• Rat

• Rattlesnake

• Rice

At which level does the path of nutrients start?

• Producer at the first trophic level

• Consumer at the second trophic level

• Consumer at the topmost trophic level

• Decomposer at the top most trophic level