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October 23 Lecture NOtes

October 23 Lecture NOtes - Pine tree life cycle Life Cycles...

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October 23, 2006 Pine tree life cycle Life Cycles of Ferns- Bryophytes: Homosporous- moss and fern Gametophytes Heterosporous- Has Pollen Sporophyte- Makes Microsporangium (Male) And Makes Mega sporangium (Female) All four of the following came from the Hamosporous Progymnaspermus (Gymnosperms): which has no sporangium and has no seeds 1. Cycad- a. Female Core makes seed b. Male Core makes the Pollen 2. Conifers- a. Has both female and male 3. Ginko- a. No Core 4. Gnetophytes- Evolution: Homosporous: Makes all the spores the same Heterasporous: make mega and micro (both are released) Retain Megaspore in Mega Sporangium (Does not drop the Mega sporangium—supplies food for the offspring) Integament- It is
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the glove around the sporangium (It came from the Capule Lobes) finally it becomes an ovule (2n) ( it is a integumentaed mega sporangium) The pine tree makes male cones— They are released and fly through the air… without the need of water They then land inside the ovule in the female (The defining feature of group—pollen lands directly on ovule) Each ovule is stuck onto a scale, and the pollen goes into there, lands on tip of ovule,
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