What is the greenhouse effect?
A
Trapping of UV radiation by Earth's surface
B
Blocking of sunlight by clouds
C
Trapping of heat energy by greenhouse gases in the atmosphere
D
Reflection of sunlight by ice caps
Analysis & Theory
The **greenhouse effect** is the **trapping of infrared (heat) radiation** by gases like CO₂ and CH₄ in Earth's atmosphere.
Which of the following is a **major greenhouse gas**?
Analysis & Theory
**Carbon dioxide (CO₂)** is one of the most significant greenhouse gases contributing to global warming.
Which of these gases is **not a greenhouse gas**?
Analysis & Theory
**Oxygen (O₂)** is not a greenhouse gas. Greenhouse gases include CO₂, CH₄, N₂O, and water vapor.
Which human activity contributes most to the increase in greenhouse gases?
C
Burning of fossil fuels
Analysis & Theory
The **burning of fossil fuels** like coal and petrol releases CO₂, a major greenhouse gas.
What effect does the greenhouse effect have on Earth's temperature?
Analysis & Theory
The greenhouse effect **raises Earth's average temperature**, contributing to **global warming**.
Which of the following is a **consequence of enhanced greenhouse effect**?
B
Increased ice formation
Analysis & Theory
**Enhanced greenhouse effect** leads to **global warming** and climate change.
Which greenhouse gas is released from **paddy fields and cattle**?
Analysis & Theory
**Methane (CH₄)** is released from **wetlands, paddy fields, and digestion in cattle.**
What is a natural source of greenhouse gases?
Analysis & Theory
**Volcanic eruptions** naturally release CO₂ and water vapor, which are greenhouse gases.
Which layer of the atmosphere is most involved in the greenhouse effect?
Analysis & Theory
The **troposphere** is the **lowest layer of the atmosphere** and is where greenhouse gases accumulate and trap heat.
Which of the following can help **reduce greenhouse gas emissions**?
A
Using more fossil fuels
Analysis & Theory
**Planting trees** increases carbon absorption and reduces the amount of CO₂ in the atmosphere.