Plant Reproduction

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Chapter 24
Plant Reproduction
Section 1 Sexual Reproduction in Seedless
Plants
Section 2 Sexual Reproduction in Seed Plants
Section 3 Asexual Reproduction
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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.

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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.

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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.

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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.

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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.

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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.

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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.

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Section 2
Sexual Reproduction in Seed Plants
Flowers

• Flowers and Their Pollinators Flowers have four
  types of partspetals, 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.

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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.

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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.

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Section 3
Asexual Reproduction
Plant Propagation

• Vegetative Reproduction People often grow plants
  from their vegetative structures. This is called
  vegetative propagation.