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Effects of different plant-related substances and conditions explained.
Ethylene sprayed on a mango tree: Ethylene accelerates fruit ripening, so spraying it on a mango tree would result in quicker and more uniform ripening of the mangoes.
Plant kept near an open window: The plant near an open window would likely receive more sunlight, enhancing photosynthesis and growth due to increased access to light.
Gibberellins applied to cabbage plant: Gibberellins promote stem elongation and growth, so applying them to a cabbage plant would lead to taller and potentially larger cabbage plants.
2,4-D applied to weeds in a paddy field: 2,4-D is a herbicide that affects dicot plants more than monocots, so applying it to weeds in a paddy field would selectively kill the broadleaf weeds while not harming the rice plants.