Question

Greenhouse effect is related to ;
A) Increased growth of green algae.
B) Global warming.
C) Cultivation of vegetables in houses.
D) Development of terrace gardens.

Answer 1

When heat is trapped close to the surface of the Earth, gradually warming it, that is what we call it as the greenhouse effect.

Complete answer:
The naturally occurring greenhouse effect is what maintains the Earth's temperature as it is. When the concentration of greenhouse gases in the atmosphere exceeds, that is when it becomes a threat. It traps extra heat causing an extreme rise in the global temperature.
So now let us analyze each of the options given above;
Option A: Increased growth of algae is not anywhere related to greenhouse effect. Therefore, this is the incorrect option.
Option B: Global warming refers to the rise in mean global temperature. When the emission of greenhouse gases increases, it leads to trapping of more heat, eventually causing a rise in the annual temperature. This is called the greenhouse effect. Therefore, this is the correct option.
Option C: Cultivation of vegetables in houses is not related to greenhouse effect. Therefore, this is the incorrect option.
Option D: Development of terrace gardens is also not right. Therefore, this is the incorrect option.

Thus, the correct option is B) Global warming.

Note: The four most contributing greenhouse gases are;

Carbon dioxide - About 81%, due to emission from fossil fuels.
Methane - 10%, from coal, natural gas, livestock, etc.
Nitrous oxide - 7%, from industrial and agricultural activities.
Fluorinated gases - 3%, from industries.