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Investigating the growth of Lemna (Duckweed) Aim: investigate one factor which affects the growth of Lemna. Introduction: Lemna is a floating aquatic plant that is generally known as "duckweed". There are several common species of duckweed including the large-leaved Spirodela (Lemna) polyrhiza, the three-lobed duckweed, L. triscula, and the common duckweed, L. minor. These duckweeds thrive on lakes and multiply until a layer of it covers the entire surface of the water, but are not usually a pest as the layer is thin and light and oxygen can still pass into the water beneath their leaves. There has been a case in Britain where a particular species of duckweed has been so successful that it blanketed the entire lake in the nature reserve of Canterbury with a mat that was five to twelve centimeters thick, thus isolating the lake from light and oxygen and killed the rich growth of underwater vegetation which...

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