Gymnosperms vs Angiosperms
Summary:
Gymnosperm means literally "naked seed". Angi means vessel or ovary, while sperm means seed. Gymnosperms originated around 360 million years ago. Gymnosperm species are divided into cycadophyta (cycads), ginkgophyta (ginkgos), gnetophyta (gnetophytes), and coniferophyta (conifers). Gymnosperms rely on the wind to pass on their seeds. The gametophytes are contained in cones. Angiosperms are flowering plants. They originated around 200 million years ago. They cover 90% of the Earth's vegetative surface. Flowers aid in pollination; they use sweet scents, bright colors, and nectar to attract pollinators. Flowers cannot be wind-pollinated. Insects, bats, and birds pollinate flowers. Angiosperms go through a double fertilization, which results in a zygote and an endosperm. The zygote develops into an embryo. The fruit around it is the ripened ovary. When an animal eats a fruit, it is inadvertently helping to disperse the seed; the seed is pooped out a distance away from the parent plant. Angiosperms can be divided into monocots (lilies, grasses, orchids, palms, etc) or dicots (roses, buttercups, maples, oaks, sunflowers, etc), or neither (water lilies, Amborella).
Relevance to Class:
We have learned about gymnosperms and angiosperms and their differences in class. We have also learned about the life cycles of both gymnosperms and angiosperms, especially angiosperms. In the notes, there was a chart showing the diversity of plants (angiosperms, gymnosperms, bryophytes, and pteridophytes).
Video Information:
Link/URL: http://www.youtube.com/watch?v=Cq9P2FU1Lgg
Author: bluedoorlabsMedia
Date: August 22, 2012
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