How do the roots of plants get air?
Underwater roots of plants usually have cut ends on the plants' stems. If you look hard enough you will notice that aquatic plants have large air spaces, but a non wetland plant stem is much denser, without large spaces. The stems of aquatic plants are made of spongy  tissue and full of holes. Air travels from the leaves above water, through the holey stem and down to the roots to give air. If you look at a water lily  stem you will notice the large size of the air spaces. Water lilies have floating leaves attached to long, flexible underwater stems. The stems must have large air spaces to make them light and elastic, or their weight would drag the leaves under the water. Sedge stems have smaller air spaces. They need  to be stiffer and stronger than the  water lily stems to support their leaves and flowers in the air.
 
 

                This is a picture of a Cattail. 

         Submergent Plants
                          Submergent plants unlike emergent plants do not grow above thewater's surface. The submergent plants in a marsh may be the same species as those in the deep water environment farther from shore. Some of these plants include coon tail, water milfoil, and bushy pond weed.

                This is a picture of duckweed

                        By. Alyssa A.

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