which two processes both increase the amount of carbon dioxide in the atmosphere?
a
volcanic eruptions and cellular respiration
b
photosynthesis and cellular respiration
c
spontaneous human combustion and photosynthesis
d
burning of fossil fuels and photosystem II and I
d
burning of fossil fuels and photosystem II and I
The two processes that both increase the amount of carbon dioxide in the atmosphere are:
d) Burning of fossil fuels and photosystem II and I
To determine which two processes both increase the amount of carbon dioxide in the atmosphere, we need to evaluate each option:
a) Volcanic eruptions and cellular respiration: Volcanic eruptions release carbon dioxide into the atmosphere, but cellular respiration actually reduces the amount of carbon dioxide by converting it into energy. So this option is incorrect.
b) Photosynthesis and cellular respiration: Photosynthesis absorbs carbon dioxide from the atmosphere to produce glucose, while cellular respiration releases carbon dioxide as a byproduct. Therefore, the correct answer is option b.
c) Spontaneous human combustion and photosynthesis: Spontaneous human combustion is not a natural process, and it does not contribute to the increase of carbon dioxide. Photosynthesis absorbs carbon dioxide, so this option is incorrect.
d) Burning of fossil fuels and photosystem II and I: The burning of fossil fuels releases a significant amount of carbon dioxide into the atmosphere. Photosystem II and I are part of the photosynthesis process, which absorbs carbon dioxide. Therefore, this option contains conflicting processes, so it is incorrect.
In conclusion, the correct answer is option b, which states that both photosynthesis and cellular respiration increase the amount of carbon dioxide in the atmosphere.