AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Waterways are most suitable for heavy and bulky goods because they are the cheapest means of transport and are fuel-efficient, making the movement of such goods economical.
Source: Waterways, Chapter 7
The key phrase from the textbook is "cheapest means of transport" and "fuel-efficient." For a 1-mark answer, directly link these two reasons to why heavy/bulky goods are best carried by water. Avoid adding extra points — one clean line is enough.