Bio Chapter 28
The transfer of pollen grains from the male to the female reproductive structure is known as
pollination
The female gametophyte in flowering plants is also called the
Embryo sac
The cross section of an overt reveals that the pistil is
Compound, with three fused carpels
Motile sperm cells are found as vestiges in these to gymnosperm groups
Cycads and Ginkgo
4 divisions of gymnosperms are
1) Cycadophyta 2) Ginkgophyta 3) Gnetophyta 4) Coniferophyta
3 cycles of modification in seed plants
1)Reduced gametophyte 2)Pollination replaces swimming 3)Seed evolved
There are at least _____ species of flowering plants worldwide
300,000
The flowering plant that may be the nearest living relative to the ancestor of all flowering plants is
Amborella
Seed plants lack which of the following structures, a) Ovules surrounded by integuments b) microspores and megaspores c) A large nutritionally independent gametophyte.
C)
A simple pistal consist of a single
Carpel
Conifers, Cycads, Ginkgo and Gnetophytes are all collectively called
Gymnosperms
A flower that lacks stamens is both ______ and ______
Incomplete and imperfect
An immature male gametophytes of a pine are called
Pollen grains
What is an ovule
Produced by seed plants, each one is a megasporangium (seed) surrounded by integuments (seed coat)
After fertilization, the ______ developed into a fruit and the ______ develops into a seed
ovary, endosperm