CH. 30

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When you look at a pine or maple tree, the plant you see is a _____.

diploid sporophyte

All seed plants _____.

are heterosporous

The adaptation that made possible the colonization of dry land environments by seed plants is most likely the result of the evolution of _____.


Gymnosperms were most abundant during the _____.


In gymnosperms megaspores develop into _____ .

female gametophytes

In pine, the embryo develops within the _____.

female gametophyte

The major difference between angiosperms and gymnosperms comes from the _____.

presence or absence of a protective covering over the ovule

Angiosperms are different from all other plants because only they have _____.


Unlike most angiosperms, grasses are pollinated by wind. As a consequence, some unnecessary parts of grass flowers have almost disappeared. Which of the following parts would you expect to be most reduced in a grass flower?


Human survival literally depends on the produce of _____.


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