tiny openings in a plant's epidermis through which carbon dioxide and water vapor gases enter and leave a leaf.
green, light-trapping pigment in plant chloroplasts
process by which plants and many other producers use light energy from the Sun to make sugars, which can be used as food.
series of chemical reactions used to release energy stored in food molecules.
positive or negative plant response to an external stimulus such as touch, light, or gravity.
plant hormone that causes plant leaves and stems to exhibit positive response to light
a plant's response to the lengths of darkness each day.
a plant that requires less than 10 to 12 hours of darkness to flower
a plant that needs 12 or more hours of darkness to flower
a plant that has no specifi.c photoperiod, and the flowering process can begin within a range of hours of darkness