NIMCET 2025 Paper

A research team is studying the effects of three different fertilizers ( $\mathit{X},\mathit{Y}$ and $\mathit{Z}$ ) on a plant species. They have four experimental plots:
- Plot 1: Fertilizer X only
- Plot 2: Fertilizer Y only
- Plot 3: Fertilizer X and Fertilizer Z only
- Plot 4: Fertilizer Y and Fertilizer Z only Observations:
- Plots with Fertilizer X showed significantly increased height vs control.
- Plots with Fertilizer Y showed slightly increased leaf area vs control.
- Plot $3\left(\mathit{X}+\mathit{Z}\right)$ showed no significant difference in height vs control.
- Plot $4\left(\mathit{Y}+\mathit{Z}\right)$ showed significantly increased height vs control.
Which conclusion is best supported?