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The Proportions Of Different Gases In The Atmosphere (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'The Proportions Of Different Gases In The Atmosphere' from the broader topic Chemistry Of The Atmosphere. The test is geared towards the AQA exam board style syllabus.
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Which gas is used as the reference for measuring the percentage composition of dry air when water vapour is excluded?
Which gas in the atmosphere is essential for combustion and respiration?
Water vapour is not given as a fixed proportion of the atmosphere because it is:
Which gas is commonly measured in parts per million (ppm) when discussing atmospheric concentration?
Which gas is the largest proportion of dry air but is largely unreactive and does not support combustion?
Which set of gases are correctly described as greenhouse gases?
Which gas concentration in the atmosphere has increased significantly since the Industrial Revolution due to human activities?
Which gas is a major greenhouse gas present in the atmosphere at roughly 0.04% (400 ppm)?
Which of the following is a direct effect of increased global atmospheric CO2 and temperature?
Plants reduce atmospheric CO2 through photosynthesis. Which simple equation represents this process?
Which gas in the troposphere can be directly harmful to human health at high concentrations and is produced by incomplete combustion of fossil fuels?