its cause generally lies in the seed coats rather than in the embryos; but in the hawthorns, as perhaps in some other seeds, it is due to embryo characters. 2. In the upper seed of the cocklebur the ...

It features live footage with superimposed terms like seed coat, embryo, monocotyledon, and dicotyledon, and discusses the conditions necessary for seed germination. The film also includes a time ...