Earth's Biomass and Human Impact Quiz

What life form does the alien humorously claim runs the planet?

• Chickens

• Humans

• Ants

• Cows

How many chickens are there compared to humans on Earth?

• Equal number of chickens and humans

• Trillions of chickens

• 19 billion chickens

• 7.6 billion chickens

What is the primary method scientists use to measure the mass of life forms?

• Estimating population size

• Measuring height

• Calculating biomass

• Counting individual animals

Which group of animals makes up the largest portion of the animal kingdom by biomass?

• Mammals

• Birds

• Fish

• Arthropods

What is the largest organism on Earth by area?

• A coral reef

• A giant sequoia tree

• A colony of mycelium

• A blue whale

Which group of organisms is the most massive on Earth?

• Plants

• Animals

• Fungi

• Bacteria

What percentage of Earth's biomass is made up by plants?

• 35%

• 60%

• 83%

• 50%

What has been the impact of human activity on large mammal species over the past 50,000 years?

• Increased their numbers

• Caused half to die out

• Doubled their population

• No impact

What percentage of land has been turned over to agriculture?

• 10 million square miles

• 18.9 million square miles

• 5 million square miles

• 25 million square miles

What is the projected human population by 2050?

• 10 billion

• 8 billion

• 9.7 billion

• 7.6 billion