Inhoudsopgave
Wat zijn sporen van sporenplanten?
Mossen en varens zijn sporenplanten. Ze planten zich voort met sporen. Een spore is meestal één enkele cel, die uitgroeit tot een nieuw organisme. Sporen zijn kleiner dan zaden.
Wat zijn voorbeelden van Zaadplanten?
De dennenappel is een voorbeeld van een naaktzadigen. Loofbomen en naaldbomen zijn bijvoorbeeld ook zaadplanten. Zaadplanten kunnen zich voortplanten door middel van zaden.
What are the characteristics of pteridophytes?
Pteridophytes show alternation of generations. Their life cycle is similar to seed-bearing plants, however, the pteridophytes differ from mosses and seed plants as both haploid gametophyte and diploid sporophyte generations are independent and free-living. The sexuality of pteridophytic gametophytes can be classified as follows:
Are strobili microphylls or sporophylls?
In all cases, the lateral organs of the strobilus are microphylls, bearing sporangia. In other lycophytes, ordinary foliage leaves can act as sporophylls, and there are no organized strobili. Liquid-preserved strobili of Selaginella, showing mega- and microsporangia through translucent sporophylls.
What is the difference between strobilus and cone?
Strobilus. Strobili are often called cones, but many botanists restrict the use of the term cone to the woody seed strobili of conifers. Strobili are characterized by a central axis (anatomically a stem) surrounded by spirally arranged or decussate structures that may be modified leaves or modified stems .
What is the evolutionary significance of a strobilus?
This evolutionary convergence is not unusual, since the form of a strobilus is one of the most compact that can be achieved in arranging lateral organs around a cylindric axis, and the consolidation of reproductive parts in a strobilus may optimize spore dispersal and nutrient partitioning.