On a plant’s leaf, there are tiny stomata. On a very hot and…

On a plant’s leaf, there are tiny stomata. On a very hot and dry summer day, a plant will often close these stomata.  (Licensed by Google)  For 2 marks, explain the main reason the plant does this.   To get your marks, make sure you answer these two parts: (1 mark) What important substance does the plant lose through its stomata when they are open? (1 mark) By closing its stomata, how does the plant help itself survive on a hot, dry day?