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What is the period of rapid cell division in which the embryo does not increase in overall size?

What structure is formed from both fetal and maternal tissue?

In a frog embryo, gastrulation

In which plant cell or tissue would the pressure component of water potential most often be negative?

Tracheids, vessel elements, and sclereids are similar in that they all

Angiosperm double fertilization is so-called because it features the formation of

In amphibian eggs, cells migrate to the interior of the embryo through the blastopore. In mammalian embryos with small amounts of yolk, this movement occurs at the

Which of the following can be found in gymnosperms?

Endosperm tissue of angiosperms has what ploidy level? 

Pollination begins when pollen is transferred from the ________ to the ________ of a flower.