Acommercial florist exposes her chrysanthemums—which are short-day plants—to a few minutes of red light during their daily darkness period in order to delay flowering. why is this action effective?

Red light act as a inhibitor and hence causes delay in flowering

Explanation:

Through Periodism phenomenon, the regulation in exposure to daylight for a certain time period can delay or enhance the flowering of the "light duration"sensitive plant.

When "short day plants" are exposed to light between  the essential long period of nights or dark period, the stage of flowering gets delayed.

Hence,  chrysanthemums on being exposed to red light during their daily darkness period lead  delay in flowering as red light act as an inhibitor.

so whats the answer

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds