ap bio plants

ap bio plants - Days 9-13 Around day 9 the plant begins to...

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Chris Dayal November 16, 2010 Period 2/3 AP BIOLOGY TIMELINE OF WISCONSIN FAST PLANT STRUCTURE Day 0 Each seed contains a tiny, new plant, called an embryo. The outside of the seed is called the seed coat. A seed can remain quiescent (sleeping) for years, as long as it stays dry and cool. Days 1-2 A day or two after planting and watering, the tiny seed germinates. During germination, the seed takes up water and swells until its seed coat cracks. Day 3 The hypocotyl (stem) pushes through the soil, pulling the seed leaves along with it. No longer needed, the seed coat drops from the cotyledons to the soil. Day 4 Above ground, the hypocotyl elongates as the plant reaches upward for light. Underground, the roots grow downward and anchor the seedling in the soil. Days 5-8 Above ground, the true leaves, stems grow and develop from a point at the very top of the plant, called the shoot meristem (growth tip). Underground root hairs grow to absorb water and nutrients from the surrounding soil and bring them to the rest of the plant.
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Unformatted text preview: Days 9-13 Around day 9 the plant begins to turn to reproduction, shifting from stem and leaf growth to flower development. Flower buds grow from the shoot meristem (growth tip). Day 14-17 Flowers bloom! OH YEAHHHH! If pollen is passed from flower-to-flower, pollination occurs. Pollen that lands on the tip of another flower's pistil grows a tube down into the pistil, where the eggs are housed. Sperm (from inside the pollen) then move down the tube until they reach the eggs and fertilize them. Days 18-20 Fertilized eggs inside the plant's pistils grow and develop to become the embryos of new seeds. The outside of the pistil swells and becomes the seed pod (or fruit) that encases several seeds. Days 21-40 Flower petals slowly wilt and fall off and seed pods Inside each seed is a tiny embryo, waiting for water and warmth so it can germinate into a new plant, and another life cycle can begin. After the seeds have dried out completely, they are ready to be planted or stored....
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ap bio plants - Days 9-13 Around day 9 the plant begins to...

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