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What did Darwin famously refer to as an “abominable mystery”?

In all seed plants, male and female _________ develop within the parent sporophyte and are completely dependent on it for nutrition and water.

This category of plants produces seeds but no fruit.

You are given an organism to identify.  It has a fruiting body that contains eight haploid spores lined up in a row in a sac.  What kind of a fungus is it most likely to be?

You are a botanist surveying a previously unstudied island.  You discover a plnat that has a small free-living gametophyte that requires external water for fertilization.  After feeeertilization, a large sporophyte with xylem and phloem develops.  The gametophyte dies and the free living sporophyte eventually releases spores from sporangia that are located on its leaves.  Into which group should you classify this plant?

Double fertilization produces a _________ embryo and a ________ endosperm.

All known members of which fungal phylum form mutualistic associations with plant roots.

A pteridologist which is a scientist that studies ferns gave a lecture to the biology class.  In the lecture, the pteridologist says Fern spores germinate into ________.

An embryo surrounded by nutritive tissue and then a tough, protective outer coat makes up a __________ that shelters the embryo from drought, cold and other adverse conditions.

Azolla filiculoides is a small fern.  How would a botanist distinguish it from a bryophyte?