Introduction to Plant Reproduction Chapter 9 – Lesson 1

Introduction To Plant Reproduction Sexual Reproduction Asexual Reproduction These processes occur in seed plants, and seedless plants.

Seed Plants Seedless Plants

Types of Reproduction Sexual Reproduction Requires the production of sex cells – sperm and egg – in reproductive organs. Offspring produced are genetically different from either parent organism. In some plants, water and wind help bring the sperm to the egg. For other plants, animals such as insects help bring the sperm and egg together.

SexualReproduction (continued) Reproductive Organs Male reproductive organs produce sperm. Female reproductive organs produce eggs. If a plant has both organs it can reproduce by itself. If organs are present on separate plants, sperm and egg must come together with the help of the elements.

Types of Reproduction (continued) Asexual Reproduction Does not involve or require the production of sex cells. One organism produces offspring that are genetically identical to it.

Examples of Asexual Reproduction Plants need to reproduce sexually in order to reproduce asexually… Plantlet on Leaf Strawberry Plant - Runner Liverwart - Gemmae

Plant Life Cycle Two stages Plants have a two-stage life cycle. The two stages are the gametophyte stage and the sporophyte stage.

Plant Life Cycle (continued) Gametophyte Stage During the gametophyte stage, gametes are produced. Gametes are sex cells (sperm and egg). The cells in this stage are haploid (n).

Gametophytes Seed Plants Seedless Plants

Plant Life Cycle (continued) Sporophyte Stage During the sporophyte stage, spores are produced. The sporophyte structures have diploid (2n) cells, but produces spores that are haploid (n).

Sporophytes Seed Plants Seedless Plants In flowering plants, the sporophyte comprises the whole multicellular body except the pollen and embryo sac Seed Plants Seedless Plants

Plant Life Cycle Diagram

Pollination and Seed Dispersal Plant Earth Pollination and Seed Dispersal