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Section 11-2

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Allen Gabat

on 11 May 2010

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Transcript of Section 11-2

By Lauren H.
Allen G.
Carlye F.
BreeAnna W. Section 11-2 Gymnosperms What are Gymnosperms? Gymnosperms are plants that produce naked seeds
(seeds that do not have a protective coat) Characteristics of gymnosperms Characteristics of Gymnosperms Needlelike or scalelike leaves
Deep-growing roots
Naked Seeds There are four types of gymnosperms Cycads 175 million years ago, it was mostly cycads on Earth
Now they are only found in tropical areas
They look like palm trees with cones This is a sago palm
a type of cycad This is a sago palm cone The seeds of cycads can be ground down into flour for tortillas Ginkgos They've been around for hundreds of millions of years
Now, there is only one type left
They can grow as tall as 25 meters
They are often in cities because they can tolerate the air pollution Gnetophytes They are the least likely to see
Found in hot dry deserts or tropical rainforests
They take different forms such as shrubs, trees or vines A ginkgo tree Ginkgo leaves Conifers Conifers are the largest group of gymnosperms. Most of them are evergreens. They hold the records for the tallest tree, the shortest tree, and the oldest tree! Reproduction a kind of gnetophyte that lives in the desert
a Ponderosa Pine Female cones Open Closed Many gymnosperms use cones to reproduce Many gymnosperms also have male and female structures on the same plant Male and Female Structures on the Same Plant Each Plant is Either Male or Female Conifers

Gnetophytes Ginkgo

Cycads If the plant has cones... This is how it reproduces Pollination- transfer of pollen from male reproductive structures to female reproductive structures Female cones are sealed until the seeds are mature. Then they open and fall to the ground. The seeds fall out. These are the pine cones you most often see. If the female cones on the tree point upward, the seeds are immature and still growing. If the female cones point downward, the seeds are mature. The females cones grow as the seeds grow. Conifers can be used to make: Clear cutting: method to get lumber, cut down trees and everything around them. BAD Clear cutting in strips: cutting down narrow strips and replanting trees in their places GOOD
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