Hi. In this video, we'll be talking about plant development, which you'll see has many similarities to animal development, but also some key differences. Now, embryogenesis is when the fertilized ovule develops into a seed containing a plant embryo, meaning that the seed is not the whole embryo. It actually contains the embryo and some support structures similar to the placenta in mammals. Now, another key difference is that plant cells don't migrate during development like animal cells do. You might remember that when we were talking about animal development, we said that some animal cells would break away and move around the developing embryo to form specialized structures. Specifically, you might remember the mesoderm, the somites, had cell clusters that would break away to form specialized structures. Well, plant cells don't migrate. They just don't move around at all, and it has to do with the fact that plant cells are different from animal cells. They have those cell walls, for example. Now, germination is the process by which a plant forms from a seed. And after germination, we have both vegetative development, which is the process that develops the roots, leaves, and stems, basically, the non-reproductive parts of the plant. There's also reproductive development, which is the process that develops the reproductive parts of the plant. So essentially, the process of plant development is how you can take a single plant cell, like we see right here, and turn that into a germinated seed like we see right there. Now, just like animal bodies have axes, plant bodies also have axes, but they're different axes. Now, you might remember that animals have an anterior-posterior axis. Well, this is similar to the apical-basal axis of a plant, which goes from the roots to the shoots, and from the stem to the tips of leaves. So here we have our apical-basal axis. There's also a radial axis, which, if you think of this as a cross-section of the stem of this plant, the radial axis is from the center of the stem outward. So this is our radial axis. Alright, let's flip the page.
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20. Development
Plant Development
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