Plants undergo alternation of generations in which __________.

Gametangia are __________.

In charophytes, __________ protect(s) zygotes from desiccation.

Which is a key difference between alternation of generations in plants and sexual reproduction in nonplant organisms?

A major division in plant systematics is based on whether a particular species has __________.

What structures allow plants to readily take up carbon dioxide from the atmosphere?

Heterosporous plants produce __________.

Ferns and mosses are limited mostly to moist environments because __________.