Ch 30 Ap Bio

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anther

Back 1

The pollen-bearing part of the stamen.

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carpel

Back 2

One of the structural units of a pistil, representing a modified, ovule-bearing leaf.

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coevolution

Back 3

The evolution of two or more interdependent species, each adapting to changes in the other. It occurs, for example, between predators and prey and between insects and the flowers that they pollinate.

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conifer

Back 4

any gymnospermous tree or shrub bearing cones

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cotyledons

Back 5

A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges, and becomes green. Also called seed leaf.

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cross-pollination

Back 6

The transfer of pollen from an anther of the flower of one plant to a stigma of the flower of another plant.

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double fertilization

Back 7

The union in flowering plants of two sperm nuclei. One sperm nucleus unites with the egg to form the diploid zygote, from which the embryo develops, and the other unites with two polar nuclei to form the triploid, primary endosperm nucleus.

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embryo sac

Back 8

The female gametophyte of a seed plant, within which the embryo develops.

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endosperm

Back 9

The nutritive tissue within seeds of flowering plants, surrounding and absorbed by the embryo.

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fiber

Back 10

One of the elongated, thick-walled cells that give strength and support to plant tissue.

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filament

Back 11

The stalk that bears the anther in a stamen.

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flower

Back 12

The reproductive structure of some seed-bearing plants, characteristically having either specialized male or female organs or both male and female organs, such as stamens and a pistil, enclosed in an outer envelope of petals and sepals.

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fruit

Back 13

The ripened ovary or ovaries of a seed-bearing plant, together with accessory parts, containing the seeds and occurring in a wide variety of forms.

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integuments

Back 14

The envelope of an ovule.

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nucellus

Back 15

The central portion of an ovule in which the embryo sac develops; the megasporangium

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ovary

Back 16

The ovule-bearing lower part of a pistil that ripens into a fruit.

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ovule

Back 17

A minute structure in seed plants, containing the embryo sac and surrounded by the nucellus, that develops into a seed after fertilization.

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petal

Back 18

One of the often brightly colored parts of a flower immediately surrounding the reproductive organs

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pollen grains

Back 19

A microspore of seed plants, containing a male gametophyte.

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seed

Back 20

the fertilized ripened ovule of a flowering plant containing an embryo and capable normally of germination to produce a new plant;

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sepal

Back 21

one of the green parts that form the calyx (outer base) of a flower

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stamen

Back 22

The pollen-producing reproductive organ of a flower, usually consisting of a filament and an anther.

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stigma

Back 23

The receptive apex of the pistil of a flower, on which pollen is deposited at pollination.

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style

Back 24

The usually slender part of a pistil, situated between the ovary and the stigma.

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tracheids

Back 25

a water-conducting and supportive element of xylem composed of long, think cells with tapered ends and walls hardened with lignin

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vessel elements

Back 26

a specialized short, wide cell in angiosperms, arranged end to end form the tubes for water transport