Catch it where it falls' is the basic idea behindA. rain water harvestingB. pollution of waterC. condensation of water vapourD. making dams to store water

To determine which option best captures the idea behind "Catch it where it falls," let's analyze each choice briefly.

1. Rain Water Harvesting

This method involves collecting and storing rainwater for reuse, often at the point of rainfall. This clearly aligns with the idea of catching water where it naturally falls.

2. Pollution of Water

This option does not relate to the concept at hand; rather, it discusses a negative aspect of water management.

3. Condensation of Water Vapour

Condensation refers to the process of water vapor turning back into liquid but does not involve the direct collection of rainfall.

4. Making Dams to Store Water

While dams are indeed used to store water, they do not catch water where it falls; instead, they capture it in a controlled environment after it has already collected.

Conclusion

The option that best fits the idea "Catch it where it falls" is A. rain water harvesting, as it involves the direct collection of rainwater at its point of occurrence, making this the most suitable answer.