Gujarat BoardEnglish MediumSTD 7ScienceForests: Our Lifeline1 Mark
MCQ
Which of the following are green lungs?
A
Green coloured lungs
B
Lungs with green algae
C
Lungs of green animals
✓
Forests
✓
Answer
Correct option: D.
Forests
Forests are called green lungs because they fix the carbon dioxide in the presence of sunlight and convert them into glucose by the process of photosynthesis.
The reaction of carbon dioxide with water during this process releases oxygen as a byproduct and glucose is formed. Thus, the forest replenishes oxygen in turn of carbon dioxide, which is the basic source of survival of life on earth.
Forests also have an important role in other bio$-$cycles such as the water cycle, oxygen cycle, and carbon cycle.
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