A group of 10 tomato plants are germinated and maintained in a large tray with no drainage. After several weeks they all begin to wilt and die despite repeated watering and fertilization. The most likely cause of this die-off is

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The lack of drainage in the large tray means that water is not able to easily drain away, leading to waterlogged soil and, ultimately, anoxic conditions. This lack of oxygen in the root zone can lead to the death of the plants.

A Group of 10 Tomato Plants Are Germinated and Maintained