Carbon cycle
1. Carbon dioxide is removed from the environment by ………………………………… in the process of ……………………………………… The carbon from the carbon
dioxide is used to make ……………………………… , ………………………………… and proteins which make up the body of plants.
2. Some of the carbon dioxide is returned to the atmosphere when plants ………………………………
3. When green plants are eaten by …………………………………, some of the carbon then becomes part of the ……………………………… , …………………………………… and
proteins which make up their bodies.
4. When animals …………………………… this carbon is released into the atmosphere as …………………………… ………………………………
5. When plants and animals die, ……………………………………… feed on their bodies. Carbon is released into the atmosphere as ………………………………
…………………………… when these organisms ……………………………………
6. Sometimes, when plants die, they are turned into fossil fuels. The …………………………… is released back into the atmosphere when these fuels are
…………………………………
Nitrogen cycle
1. Green plants absorb nitrogen in …………………………………… from the soil.
2. They use these ………………………………… to make …………………………………….
3. When these plants are eaten by animals, some of the nitrogen then becomes part of the ……………………………… in their bodies.
4. …………………………………………. break down the bodies of dead animals and plants, and their waste products, producing …………………………………… compounds.
5. These …………………………………. compounds are converted to …………………………………….. by …………………………………… bacteria.
6. Nitrogen from the soil is released back into the atmosphere by ………………………………………. bacteria.
7. Nitrogen gas from the air can be fixed by ………………………………… fixing bacteria in …………………………………… …………………………………… of plants such as
……………………………… and …………………………………
Carbon cycle
1. Carbon dioxide is removed from the environment by ………………………………… in the process of ……………………………………… The carbon from the carbon
dioxide is used to make ……………………………… , ………………………………… and proteins which make up the body of plants.
2. Some of the carbon dioxide is returned to the atmosphere when plants ………………………………
3. When green plants are eaten by …………………………………, some of the carbon then becomes part of the ……………………………… , …………………………………… and
proteins which make up their bodies.
4. When animals …………………………… this carbon is released into the atmosphere as …………………………… ………………………………
5. When plants and animals die, ……………………………………… feed on their bodies. Carbon is released into the atmosphere as ………………………………
…………………………… when these organisms ……………………………………
6. Sometimes, when plants die, they are turned into fossil fuels. The …………………………… is released back into the atmosphere when these fuels are
…………………………………
Nitrogen cycle
1. Green plants absorb nitrogen in …………………………………… from the soil.
2. They use these ………………………………… to make …………………………………….
3. When these plants are eaten by animals, some of the nitrogen then becomes part of the ……………………………… in their bodies.
4. …………………………………………. break down the bodies of dead animals and plants, and their waste products, producing …………………………………… compounds.
5. These …………………………………. compounds are converted to …………………………………….. by …………………………………… bacteria.
6. Nitrogen from the soil is released back into the atmosphere by ………………………………………. bacteria.
7. Nitrogen gas from the air can be fixed by ………………………………… fixing bacteria in …………………………………… …………………………………… of plants such as
……………………………… and …………………………………