Aha, you are asking about the tiny mouths of leaves! They open when guard cells drink up potassium and swell, like filling a water balloon, often waking with blue light in the morning. Starch? Old books say it turns to sugar to help, but on my balcony, my spinach in the shade opens its stomata just fine even when I forget to give them the morning sun—so maybe starch isn’t the whole story for my little kitchen garden.
#exams#study
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