Gymnosperms

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Across
  1. 2. Have flagellate sperm and coralloid roots.
  2. 4. Egg cells and the female gametophyte have only one set of chromosomes, so they are _____________.
  3. 5. __________pine trees continue photosynthesis during winter; whereas Douglas fir shuts down photosynthesis.
  4. 6. Have xylem vessels, but no flowers or fruit.
  5. 8. Protects the megasporangium and becomes the seed coat after fertilization
  6. 9. 2N
  7. 10. Has stinky seeds that are delicious roasted, but also toxic.
  8. 12. Develops from a zygote after fertilization.
Down
  1. 1. Have complex seed cones but lack double fertilization.
  2. 3. Gymnosperm gametophytes remain attached to the ________________ so that the young embryo can be nourished by “grandma”.
  3. 7. Gymnosperms produce these, but bryophytes, lycophytes and pteridophytes don’t.
  4. 9. The ______ redwood was presumed extinct until World War II.
  5. 10. Contained within the megaspore or microspore of gymnosperms - these haploid stages produce eggs and sperm.
  6. 11. A valve system within conifer tracheids that prevents air bubbles (embolisms)during freezing conditions.