Question

The level of carbon dioxide was measured in a garden and on a city road. Where do you think the carbon dioxide level will be higher and why?

The carbon dioxide level will be same at both places because the amount of carbon dioxide at all places on the earth is the same.
The carbon dioxide level in the city will be higher because the exhaust gases from vehicles release carbon dioxide and there are not many trees to utilize it.
The carbon dioxide level in the garden will be higher because of the many plants present which are constantly releasing carbon dioxide by photosynthesis.
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Answer 1

The carbon dioxide level in the city will be higher because the exhaust gases from vehicles release carbon dioxide and there are not many trees to utilize it.

Plants go through photosynthesis using carbon dioxide, releasing oxygen in the process, so more of the carbon dioxide is used in the garden. Plus, there is more carbon dioxide in the city to begin with, simply because there are more vehicles with more exhaust.