1. (2n) In most conifer sp, each tree has both ovulate and pollen cones.
2. (2n) Microsporocytes divide by meiosis, producing haploid microspores. A microspore develops into a pollen grain (a male gametophyte enclosed within the pollen wall).
3. (2n) Ovulate cone scale ha 2 ovules, each containing a megasporangium.
4. (2n) Pollination occurs when a pollen grain reaches the ovule. The pollen grain then germinates, forming a pollen tube that slowly digests its way through the megasporangium.
5. (n) While the pollen tube develops, the megasporocyte undergoes meiosis, producing four haploid cells. One survives as a megaspore.
6. (n) The megaspore develops into a female gametophyte that contains two or three archegonia, each of which will form an egg.
7. (n) By the time the eggs are mature,
two sperm cells have developed in the pollen tube, which extends to the female gametophyte. Fertilization occurs when sperm and egg nuclei unite.
8. (2n) Fertilization usually occurs more than a year after pollination. All eggs may be fertilized, but usually only one zygote develops into an embryo. The ovule becomes a seed, consisting of an embryo, food supply, and seed coat.
-flower parts multiples of 3
-vascular tissue in stem scattered
-fibrous root system
Incl: Grasses, grains, palm trees, coconut, some garden plants like lilies, onions
-net like vein
-flower parts multiples of 4 or 5
-vascular tissue in stem arranged in rings
Incl: Most veggies we eat, most trees; apple, bean, pea, tomato, oak tree