A potted plant is moved from a cool room into a warm greenhouse, with the light and the air movement unchanged. What happens to its rate of transpiration?

Explanation

Warmth gives water molecules more energy both to leave the wet cell surfaces inside the leaf and to diffuse away once they are outside it, so the plant loses water faster than before. The idea that heat makes a leaf hold on to water borrows from what happens to enzymes at extreme temperatures, and an ordinary greenhouse sits well inside the range a plant copes with.