Campbell Biology Chapter 30 Key Terms

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Campbell Biology
Chapter 30
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1

Anther

In an angiosperm, the terminal pollen sac of a stamen, where pollen grains containing sperm-producing male gametophytes form.

2

Basal Angiosperm

A member of one of three clades of early-diverging lineages of flowering plants. Examples are Amborella, water lilies, and star anise and its relatives.

3

Carpels

The ovule-producing reproductive organ of a flower, consisting of the stigma, style, and ovary.

4

Double Fertilization

A mechanism of fertilization in angiosperms in which two sperm cells unite with two cells in the female gametophyte (embryo sac) to form the zygote and endosperm.

5

Embryo Sac

The female gametophyte of angiosperms, formed from the growth and division of the megaspore into a multicellular structure that typically has eight haploid nuclei.

6

Endosperm

In angiosperms, a nutrient-rich tissue formed by the union of a sperm with two polar nuclei during double fertilization. The endosperm provides nourishment to the developing embryo in angiosperm seeds.

7

Fruit

A mature ovary of a flower. The fruit protects dormant seeds and often aids in their dispersal.

8

Integument

Layer of sporophyte tissue that contributes to the structure of an ovule of a seed plant.

9

Magnoliid

Member of the angiosperm clade that is most closely related to the combined eudicot and monocot clades. Extant examples are magnolias, laurels, and black pepper plants.

10

Micropyle

A pore in the integuments of an ovule.

11

Monocot

Member of a clade consisting of flowering plants that have one embryonic seed leaf, or cotyledon.

12

Ovary

In flowers, the portion of a carpel in which the egg-containing ovules develop.

13

Ovule

A structure that develops within the ovary of a seed plant and contains the female gametophyte.

14

Petal

A modified leaf of a flowering plant. Petals are the often colorful parts of a flower that advertise it to insects and other pollinators.

15

Pollen Grain

In seed plants, a structure consisting of the male gametophyte enclosed within a pollen wall.

16

Pollination

The transfer of pollen to the part of a seed plant containing the ovules, a process required for fertilization.

17

Sepals

A modified leaf in angiosperms that helps enclose and protect a flower bud before it opens.

18

Stamen

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

19

Stigma

The sticky part of a flower's carpel, which receives pollen grains.

20

Style

The stalk of a flower's carpel, with the ovary at the base and the stigma at the top.