Unit 1 Review (Ecology)

Which of the following describes soil and temperature in an ecosystem?

• abiotic factors

• biotic factors

• unnecessary factors

• selection factors

Which of the following characteristics is usually shared by bacteria, fungi, and plants?

• they have cell walls

• they have nuclei

• they are unicellular

• They have the ability to make their own food.

Which of the following statements is not correct?

• Plants and other producers get their energy directly from the sun.

• Animals get their energy from the sun indirectly.

• Bacteria that live deep in the ocean get their energy from hydrogen sulfide in hot water.

• Consumers get their energy directly from the sun.

If an insect eats a plant and a bird eats the insect, about how much energy from the plant is stored in the insect for the bird to use?

• 90%

• 50%

• 10%

• 1%

Which of the following does not contain carbon from the bodies of plants and animals that died millions of years ago?

• coal

• oil

• natural gas

• phosphate salts

Which statement describes how humans are affecting the balance of carbon in the atmosphere?

• Fewer agricultural crops are planted, reducing the amount of carbon dioxide released into the atmosphere.

• Burning fossil fuels in great quantities has increased the amount of carbon dioxide in the atmosphere.

• Overgrazing of grasslands has reduced the amount of carbon dioxide in the atmosphere.

• Severe drought in large areas of the world has decreased the amount of carbon dioxide that is released into the atmosphere.

Which of the following is responsible for making nitrogen in the atmosphere usable by living organisms?

• absorption of nitrogen in rain

• conversion of nitrogen into carbohydrates by photosynthesis

• nitrogen-fixing bacteria

• decomposing bacteria

A group of squirrels living in a park would be considered a

• abiotic factor

• population

• community

• ecosystem

Birds, trees, the air, sunlight and water would be considered a(n)

• abiotic factor

• population

• community

• ecosystem

A plant growing towards a light source is the best example of

• metabolism

• response to stimuli

• growth

• asexual reproduction