13.C Carbon and Nitrogen Cycle

1. Which of the following is NOT true about plants in the carbon cycle

• 1. Plants take in carbon for photosynthesis

• 1. Plants decompose and transfer carbon into the soil.

• 1. Plants use the carbon from the atmosphere to build their bodies.

• 1. Plants only take in carbon from the atmosphere and never release carbon into the atmosphere

1. Which of the following is NOT a way that carbon moves into the atmosphere?

• 1. Out of the ocean

• 1. Burning of fossil fuels

• 1. Plants and animals are respiring

• 1. Dead organisms become fossil fuels

1. Why are nitrogen-fixing bacteria important for an ecosystem?

• 1. They convert the nitrogen in plants and animals into nitrogen gas.

• 1. They transform atmospheric nitrogen into a form that can be taken up by plants

• 1. They turn carbon dioxide into oxygen

• 1. They don't serve a roll in the ecosystem.