Greenhouse gases are:
- Gases used in house for cooking: This option is incorrect as greenhouse gases are not related to gases used for cooking in houses.
- Green in colour: This option is incorrect as the term "greenhouse" in greenhouse gases does not refer to the color, but rather to the concept of trapping heat.
- Traps solar radiations and increase temperature: This option is correct. Greenhouse gases are gases that absorb and emit infrared radiation within the thermal infrared range. They trap solar radiation in the Earth's atmosphere, which leads to an increase in temperature, known as the greenhouse effect.
- None of these: This option is incorrect as option C is the correct answer.
In summary, greenhouse gases are gases that trap solar radiation and increase the temperature of the Earth's atmosphere. They are not related to gases used for cooking in houses or their color.

Greenhouse gases are gases that trap solar radiation and increase the temperature of the Earth's atmosphere. These gases play a crucial role in maintaining the Earth's temperature and supporting life on the planet. Let's understand more about greenhouse gases and their impact on the environment.

What are Greenhouse Gases?
Greenhouse gases are a group of gases present in the Earth's atmosphere that have the ability to trap heat from the sun. These gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and fluorinated gases. While these gases make up a small portion of the atmosphere, they have a significant impact on the Earth's climate.

How do Greenhouse Gases Trap Heat?
When sunlight reaches the Earth, some of it is absorbed by the surface while the rest is reflected back into space. Greenhouse gases in the atmosphere absorb the heat energy that is radiated from the Earth's surface, preventing it from escaping into space. This process is known as the greenhouse effect.

Impact of Greenhouse Gases on Climate Change
While the greenhouse effect is essential for life on Earth, an increase in greenhouse gas concentrations can lead to global warming and climate change. Human activities, such as burning fossil fuels, deforestation, and industrial processes, have significantly increased the levels of greenhouse gases in the atmosphere.

Consequences of Increased Greenhouse Gas Emissions
The increase in greenhouse gas emissions has led to several consequences:

1. Global Warming: The Earth's average temperature has been steadily increasing, leading to changes in weather patterns, rising sea levels, and melting polar ice caps.

2. Climate Change: Changes in temperature and precipitation patterns can have severe impacts on ecosystems, agriculture, and human health.

3. Ocean Acidification: Increased CO2 levels in the atmosphere are absorbed by the oceans, leading to acidification and harming marine life.

4. Extreme Weather Events: Rising temperatures contribute to the frequency and intensity of extreme weather events such as heatwaves, droughts, hurricanes, and floods.

5. Loss of Biodiversity: Climate change affects ecosystems and can lead to the extinction of species, disrupting the delicate balance of biodiversity.

Conclusion
In conclusion, greenhouse gases are gases that trap solar radiation and increase the temperature of the Earth's atmosphere. Their increase due to human activities has led to global warming, climate change, and numerous environmental consequences. It is crucial to reduce greenhouse gas emissions and adopt sustainable practices to mitigate the impacts of climate change and ensure a sustainable future for our planet.