Which of the following vascular plants have been used as an abrasive because of the silica in their cell wallsa) club mosses b) fernsc) horsetailsd) sphagnum
C) horsetails
The correct answer is c) horsetails.
Horsetails (Equisetum spp.) have silica in their cell walls and have been used as a natural abrasive for polishing and cleaning. The stems of some horsetails can be used to scour pots and pans, and some species have historically been used for sandpaper. The other options, such as club mosses, ferns, and sphagnum, do not have silica in their cell walls and have not been used as abrasives.
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