Lecture 6 Flashcards
1
Q
What are gymnosperms
A
Non-flowering seed plants with naked seeds (not enclosed in ovaries)
2
Q
What are representatives of Gymnosperms
A
o Cycads
o Conifers
o Ginkgos
o Strange plants: Welwitscha or Ephedra
3
Q
What is some related information to the represenatives of gymnosperms
A
- motile sperm cells can be found only in cycads and ginkgos
- cycads have fern-like pinnate leaves with circinate vernation
- conifers produce resin in resin ducts;
- pollen grains have often large sacs which aid their effective wind dispersal.
- Seeds of confers are mostly hidden in woody seed cones but sometimes they grow single, surrounded by fleshy tissue (such as in yew or podocarps)
- the alkaloid ephedrin is found in Ephedra (mormon tea) plants, found in the arid subtropic regions
4
Q
A
