Answer: A bean seed contains a certain amount of reserve carbohydrates to sustain the new seedling. After this nutrient reserve is used up the seedling must be able to sustain itself through photosynthesis (the process by which green plants use sunlight to manufacture their own food in the form of simple sugars.) Those tall, spindly, pale plants in the dark were stretching and reaching to find the light they need for photosynthesis. In time, as their initial food reserve is depleted, they will die from lack of nutrients. Healthy bean plants will appear stocky, lush, and bright green. So, as you can see, plant height is not necessarily an indicator of plant health. Note too that sunlight is generally much brighter than artificial lights. So plants grownon a windowsill may actually be receiving more light than those grown under artificial lights 24 hours a day.
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