Biology 24.1

CH. 24-1 REPRODUCTION WITH CONES AND FLOWERSCh. 24 Reproduction of Seed Plants

Pollen Cone

Cone in gymnosperms that produces male gametophytes in the form of pollen grains

Seed Cone

Cone that produces female gametophytes

Ovule

Structure in seed cones in which female gametophytes develop

Pollen Tube

Structure grown y a pollen grain; contains two haploid sperm nuclei

Sepal

Outermost circle of flower parts that encloses a bud before it opens and protects the flower while it is developing

Petal

Brightly colored structure just inside the sepals; attracts insects and other pollinators to a flower

Stamen

Male part of the flower; made up of an anther and a filament

Filament

Long thin structure that supports an anther

Anther

Flower structure in which haploid male gametophytes are produced

Carpel

Innermost part of a flower that produces the female gametophytes

Ovary

In a flower structure that contains one or more ovules from which female gametophytes are produced

Style

Narrow stalk of the carpel in a flower

Stigma

Sticky portion at the top of the style where pollen grains frequently land

Embryo Sac

Female gametophyte within the ovule of a flowering plant

Endosperm

Food-rich tissue that nourishes a seedling as it grows

Double Fertilization

Fertilization in angiosperms, in which two distinct fertilization events take place between the male and female gametophytes.

Key Concepts

Reproduction in gymnosperms takes place in cones, which are produced by a mature sporophyte plant.

Key Concepts

Flowers are reproductive organs that are composed of four kinds of specialized leaves: sepals, petals, stamens, and carples.

Key Concepts

Reproduction in angiosperms takes place within the flower. Following pollination and fertilization, the seeds develop inside protective structures.

Key Concepts

Most gymnosperms and some angiosperms are wind pollinated whereas most angiosperms pollinated by animals