It’s autumn, and that means the leaves on the trees are turning beautiful shades of yellow and red, before falling off entirely. It provides cheap entertainment for people and pets. It’s a way ...

To avoid this, an individual plant may open its stomata and evaporate water which will lower the leaf temperature. Thus, one may hypothesize that leaves in the sun should have higher stomata density ...

A leaf usually has a large surface area, so that it can absorb a lot of light. Its top surface is protected from water loss, disease and weather damage by a waxy layer. The upper part of the leaf ...