Garner and Allard could not have done the Maryland Mammoth experiments in the tropics because:

Question

Quizplus · Accepted Answer

The Maryland Mammoth experiments by Garner and Allard demonstrated the concept of photoperiodism, showing that certain plants require specific lengths of daylight to flower. In the tropics, daylength is relatively constant and does not vary as much as it does in temperate regions, staying close to 12 hours throughout the year. This constancy means the daylength never falls below the critical threshold needed to trigger flowering in short-day plants like the Maryland Mammoth tobacco, making such experiments impractical there.

Garner and Allard Could Not Have Done the Maryland Mammoth