Carbon and nitrogen Cycle

Front

How does carbon in a grass plant get into a lion?

Back

The lion eats an antelope that ate the grass

Front

Which of the following add carbon dioxide to the atmosphere? Options: volcanoes, combustion of fossil fuels, animal and plant respiration, all of these

Back

all of these

Front

What is happening at 1? Options: respiration: releasing CO₂, decomposing CO₂ in the soil, photosynthesis: absorbing CO₂, turning CO₂ from the atmosphere into organic molecules

Back

respiration: releasing CO₂

Front

Features of environment that are alive or were once alive

Back

biotic

Front

How much of the atmosphere is composed of nitrogen gas?

Back

78%

Front

Why do all organisms need nitrogen?

Back

To live and grow 

Front

How nitrogen is "fixed" into useable form for plants?

Back

through action of bacteria & lightning

Front

Nitrogen fixing bacteria live in nodules on the root of which plant? Options: Broccoli, Legumes, Beets, Carrots

Back

Legumes

Front

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide. Options: Water, Atmosphere, Sun, Air

Back

Atmosphere

Front

The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature? Options: lower levels of ozone in the atmosphere, lower levels of nitrogen in the atmosphere, higher levels of carbon dioxide and other greenhouse gases in the atmosphere, higher levels of oxygen in the atmosphere

Back

higher levels of carbon dioxide and other greenhouse gases in the atmosphere