Which of the following statements are true about the Greenhouse effect.

Question

I.It is a natural process
II.it helps to filter harmful radiation from the sun.
III.It is caused by gases like chlorofluorocarbons
IV.some human activities enhance the green house effect.
A.I,II and III only
B.I,II and IV only
C.I,II,III and IV only
D.II,III and IV only

Answer 1

The correct answer is B. I, II, and IV only.

Here's the reasoning:

I. It is a natural process - True. The greenhouse effect is a natural phenomenon that warms the Earth’s surface.

II. It helps to filter harmful radiation from the sun - True. The greenhouse effect includes gases that can absorb and re-radiate infrared radiation, contributing to the regulation of the Earth’s temperature.

III. It is caused by gases like chlorofluorocarbons - False. While chlorofluorocarbons (CFCs) are related to atmospheric processes and are potent greenhouse gases, the greenhouse effect itself is primarily caused by gases such as carbon dioxide (CO2), methane (CH4), and water vapor. CFCs are not a primary cause of the greenhouse effect.

IV. Some human activities enhance the greenhouse effect - True. Human activities, such as burning fossil fuels and deforestation, increase the concentration of greenhouse gases in the atmosphere, enhancing the natural greenhouse effect.

Thus, statements I, II, and IV are true while statement III is false.