Photosynthesis and Respiration

Humans burn fossil fuels and wood, releasing carbon dioxide into the atmosphere. This carbon dioxide is then absorbed by trees for photosynthesis. These processes are contributory to which chemical cycle?

• The carbon cycle

• The water cycle

• The nitrogen cycle

• The phosphorous cycle

In the carbon cycle, animals can release carbon back into the cycle through __________ or through __________.

• burning . . . photosynthesis

• fixation . . . decomposition

• decomposition . . . photosynthesis

• respiration . . . decomposition

• respiration . . . photosynthesis

How do organisms (living things) move carbon through the carbon cycle?

• Respiration only

• Decomposition only

• Photosynthesis, respiration, and decomposition

• Decomposition and sedimentation

• Respiration, decomposition, sedimentation, and photosynthesis

What kind of organism takes out the most carbon from the atmosphere?

• Plants

• Bacteria

• Animals

• Humans

Plants need ________from the air for photosynthesis

• oxygen

• soil

• carbon dioxide

• sugar

you breathe in oxygen for

• photosynthesis

• fermentation

• mitosis

• cellular respiration

Which of the following removes carbon from the atmosphere?

• Combustion

• Respiration

• Photosynthesis

• Death

Plants use ____________________ to make their own food.

• Carbon Dioxide

• Oxygen

• Materials

• Gravity

Respiration is the process by which animals take in _____ and release _____.

• photosynthesis, air

• carbon, oxygen

• oxygen

• oxygen, carbon dioxide

What 2 things does a plant make during photosynthesis?

• oxygen, glucose

• glucose, carbon dioxide

• useable energy, glucose

• oxygen, carbon dioxide