Hi there,
by photosynthesis they convert c02 nd water to sugar.they absorb solar energy nd transform co2 into  glucose nd 02.
they transport food to all part of the body through phloem.
i hope this helps u..
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Co2 is converted into glucose(c6h1206) by a process called photosynthesis where h2o,co2 in the presence of sunlight enzymes and chlorophyll is used i this process.
it is converted into starch and transported by a vascular tissue called the phloem 
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