This question checks whether you can tell apart several related terms used for growing plants without soil.
- Nutrient culture: this phrase is used informally in places but it is not the standard agronomy term for root growth suspended purely in a mineral solution.
- Aquaculture: this word belongs to fisheries science, the farming of fish, prawns and other aquatic animals, and has nothing to do with growing terrestrial plants.
- Soilless culture: this is the general category name for any soil-free growing method, which also includes solid but soil-free media like sand, gravel or rockwool, so it is broader than what the question describes.
- Solution culture: this names the specific method where a terrestrial plant's roots hang directly in an aerated liquid mineral nutrient solution with no solid medium at all, matching the question's wording exactly.
Since the question stresses growth "in mineral nutrient solutions" with no soil, it points at the narrower, specific technique rather than the broad category, so the correct term is solution culture.
Let's summarize:
- Soilless culture is the umbrella term, it can include solid soil-free media.
- Solution culture is one type of soilless culture, where roots sit only in liquid nutrient solution.
So the final answer is solution culture.