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Unformatted text preview: sporophytes . 6. There is silica in the cell wall of the epidermis of horsetails, which increase the hardness of the cell and make horsetail a good tool in cleaning the dirty pots and pans outdoor. 7. During the coal age, which group of plants is dominant in the lowlands and swamps? The horsetail and club mosses 8. The low oxygen level in the swamps of the coal age is the important factor that allowed the dead seedless vascular plants to remain long enough to become coal. Why? Because they were not readily attacked by decay bacteria...
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- Spring '08
- Plants, Seedless Vascular Plants, Fern, Spore, fern sporangia, Vascular Plants Review