microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 韌皮部 個影片檔及 b 捲影像00:11
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 韌皮部 個影片檔及 b 捲影像00:19
evolution of vascular plants: the ferns - part 7 of 28. describes the evolution of vascular systems in land plants. the highly specialized structures that occur in vascular plants are shown through investigation of the fern. explains the adaptive advantag - 韌皮部 個影片檔及 b 捲影像00:34
microscopic cross sectional view through woody stems to show vascular bundles, xylem, cambium, phloem - 韌皮部 個影片檔及 b 捲影像00:16
t/l of growing fern (kingdom: plantae, division: pteridophyta) plants and uprolling young frond. this clip includes a transparent background. clip isolated on black is also available - 韌皮部 個影片檔及 b 捲影像00:20
flower of capsella bursa-pastoris w.m.under light microscope zoom in different area - 韌皮部 個影片檔及 b 捲影像00:08
flower of capsella bursa-pastoris w.m.under light microscope zoom in different area - 韌皮部 個影片檔及 b 捲影像00:14