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why do plants need light to survive

Light is something that sustains all life on this planet, but we may wonder why do plants grow with light? When you buy a new plant, you may wonder what kind of light do plants need? Do all plants need the same amount of light? How can I tell if my plant is having problems with too little light? Keep reading to answer these questions on how light affects the growth of a plant. All things need energy to grow. We get energy from the food we eat. Plants get energy from light through a process called. This is how light affects the growth of a plant. Without light, a plant would not be able to produce the energy it needs to grow. What Kind of Light Do Plants Need? While plants need light to grow, not all light or plants are the same.

If someone asks, What kind of light do plants need they may be referring to the light spectrum. Plants are affected by light that falls into the blue spectrum of the light scale. Daylight,
and grow lights all have blue tones in them and will help provide the light your plant needs. Incandescent and halogen lights are more red and will not help your plant grow. The question, What kind of light do plants need may also refer to time needed in light. Normally they are referred to as /shade, /part sun or /full sun plants. Low or shade plants may need only a few hours of light a day while high or full sun plants need eight or more hours of light a day. Sometimes a plant will not get enough light and will have problems with too little light.

Plants affected by light shortages or too little blue light will have the following signs: Asked by: Preston Shumack, US All plants can survive for short periods without light. Obviously, they need to be able to last through the night, but they can also cope with a longer darkness in an emergency. If you leave a tent pitched on the same patch of lawn, the grass underneath turns yellow and spindly. This is an adaptation, called etiolation, which focuses the plants remaining resources into growing as far as possible to try and reach sunlight again. There are also some plants that have lost the power of photosynthesis altogether. The genus Orobanche (commonly known as broomrape) is an example.

The plants have no chlorophyll and get all their nutrients by parasitically attaching to the roots of nearby plants instead. Although broomrape doesnt harness sunlight itself, it is still indirectly reliant on the Sun to provide energy to its host plant. Some other parasitic plants, called mycoheterotrophs, feed on fungi and these could theoretically survive in complete darkness for months or even years. But of course, those fungi in turn get their energy by digesting dead plants, and in a permanently dark world, this food source would eventually run out. No plant can live without sunlight forever. P Get more fascinating Q As from BBC Focus magazine by following

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