Fossil Plants

3. the shape of leaf margins in temperate regions
6. time period when fossil plants were particularly prevalent in the UK, forming extensive coal deposits
7. the vascular tissue of a plant that carries food
8. pores with controllable apertures that control the amount of water and gases that enter and leave the plant
10. the style of preservation that leads to "petrified wood"
12. feature of leaves in the tropics which allows water to drain off (4,3)
13. period of time when forests first developed
15. land plants are thought to have evolved from this aqueous plant (5,5)

1. the time period when flowering plants evolved
2. example of a non-vascular land plant (or bryophyte)
4. plants with unenclosed seeds including conifers and ginkgos
5. genus name of fossil lycopsid with distinctive diamond shaped leaf scars on its bark
6. genus name of fossil horsetail plant with finely ribbed branches separated by nodes
9. the green pigment that absorbs light in plants allowing them to photosynthesise
11. the vascular tissue of a plan that carries water
14. group of plants characterised by having fronds, and spores housed on the underside of leaves