Question 2
Using organic fertiliser instead of chemical fertiliser is which of the 4Rs?
The right answer is the one marked above.
Replace. A harmful material is replaced by an environment-friendly one.
Lesson: Chapter 15 — The biosphere
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Using organic fertiliser instead of chemical fertiliser is which of the 4Rs?
The right answer is the one marked above.
Replace. A harmful material is replaced by an environment-friendly one.
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