Chapter 24
Plant Reproduction
Section 1: Sexual Reproduction in
Seedless Plants
Section 2: Sexual Reproduction in
Seed Plants
Section 3: Asexual Reproduction
Section 1
Sexual Reproduction in Seedless Plants
Objectives:
•Summarize the life cycle of a moss.
•Summarize the life cycle of a fern.
•Compare and contrast the life cycle of a moss with
the life cycle of a fern.
Section 1
Sexual Reproduction in Seedless Plants
Reproduction in Nonvascular Plants
•Life Cycle of a Moss In mosses, the “leafy” green
gametophytes are larger than the sporophytes, which
consist of a bare stalk and a spore capsule. Water is
necessary for fertilization.
Section 1
Sexual Reproduction in Seedless Plants
Reproduction in Seedless Vascular Plants
•Life Cycle of a Fern In the life cycle of a fern, the
sporophytes are much larger than the gametophytes.
The thin, green, heart-shaped gametophytes produce
both sperm and eggs. Water is necessary for
fertilization.
Section 2
Sexual Reproduction in Seed Plants
Objectives:
•Distinguish the male and female gametophytes of
seed plants.
•Describe the function of each part of a seed.
•Summarize the life cycle of a conifer.
•Relate the parts of a flower to their functions.
•Summarize the life cycle of an angiosperm.
Section 2
Sexual Reproduction in Seed Plants
Reproductive Structures of Seed Plants
•Reproductive Structures The tiny gametophytes of
seed plants develop from spores that remain within
sporophyte tissues. Male gametophytes develop into
pollen grains, while female gametophytes develop
inside ovules.
Section 2
Sexual Reproduction in Seed Plants
Seeds
•Parts of a Seed A seed contains an embryo, which is
a new sporophyte, and a supply of nutrients for the
embryo. The cotyledons of an embryo help transfer
nutrients to the embryo. A seed coat covers and
protects a seed.
Section 2
Sexual Reproduction in Seed Plants
Cones
•Life Cycle of a Conifer In gymnosperms, male and
female gametophytes develop in separate cones on
the sporophytes. After fertilization, ovules develop
into seeds, which grow into new sporophytes.
Section 2
Sexual Reproduction in Seed Plants
Flowers
•Flowers and Their Pollinators Flowers have four
types of parts—petals, sepals, stamens, and pistils.
Petals attract pollinators. Sepals protect buds and may
also attract pollinators. Pollen forms in anthers of
stamens. Seeds develop in the ovary of a pistil.
•Life Cycle of an Angiosperm In angiosperms, male
and female gametophytes develop in the flowers of
the sporophytes. After fertilization, ovules develop
into seeds, which grow into new sporophytes.
Section 3
Asexual Reproduction
Objectives:
•Describe several types of vegetative reproduction in
plants.
•Distinguish sexual reproduction in kalanchöes from
asexual reproduction in kalanchöes.
•Recommend several ways to propagate plants.
Section 3
Asexual Reproduction
Vegetative Reproduction
•Vegetative Reproduction Vegetative reproduction
is the growth of new plants from nonreproductive
plant parts, such as stems, roots, and leaves.
Section 3
Asexual Reproduction
Plant Propagation
•Vegetative Reproduction People often grow plants
from their vegetative structures. This is called
vegetative propagation.