Paul Andersen explains the major plants structures. He starts with a brief discussion of monocot and dicot plants. He then describes the three main tissues in plants; dermal, ground and vascular. He also describes the plant cells within each of these tissues; epidermis, parenchyma, collenchyma, sclerencyma, xylem and phloem. He describes both primary and secondary growth in plants. He finishes the podcast with a discussion of double fertilization in plants.
Great video. The first couple minutes would be applicable to middle school (monocot and dicot basics). About 3 minutes in, the video gets much deeper into plant structure- high school applicable.
Very helpful and informative even if it is heavy on the vocabulary. Good explanation.