Question

If CO${}_2$ is absent in atmosphere of earth then

• A. Temperature will decrease
• B. Temperature will increase
• C. Plants will flourish well
• D. No effect

Answer 1

The correct option is A Temperature will decrease

The total carbon dioxide content in the atmosphere is 0.03%. The percentage of carbon dioxide is balanced by respiration and photosynthesis. Solar radiation falls on earth's surface heating it, while a small proportion is reflected back, and earths surface re-emits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (e.g., carbon dioxide, methane, etc.) absorb a major fraction of it. These gases like carbon dioxide and methane are commonly known as greenhouse gases because they are responsible for the greenhouse effect. Increase in the level of greenhouse gases has led to considerable heating of earth leading to global warming. Thus, the correct answer is option A..