SSS3 Biology: Reproduction In Flowering Plants

Описание: This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to identify the structures in a flower and describe the processes of gamete formation, pollination, fertilization, and fruit and seed formation.

Lesson summary
Prerequisites
Students should already be familiar with meiosis and gamete formation, the process of reproduction and the concept of sexual reproduction.

Overview
The different parts of flowers are specialized to help plants reproduce as efficiently as possible. There is a female part of the flower, and a male part of the flower. The female part of the flower is in the center (point), and is made up of the ovary, the style, and the stigma. The stigma is sticky and captures the pollen from other flowers (sometimes carried on the legs and abdomen of pollinators such as bees, butterflies, hummingbirds etc.). The pollen germinates on the stigma and travels down the inside of the style, toward the ovary. Once the pollen reaches the ovary, it combines with the female gamete to make a seed, or ovule. The male part of the flower is the anther, stamen and filament. The anther carries the pollen, which fertilizes the female parts of the flower. The stamen and the filament hold up the anther. The petals are the colorful structures that help the flower to attract pollinators. Sepals are like petals, usually attaching below the petals on the receptacle. The receptacle is the part of the flower that is left once the flower has been fertilized, and the petals fall off. This part of the flower swells as the seeds develop. The peduncle is the junction between the receptacle and the stem of the flower.

Objectives
Students will be able to:
Identify the major organs of a flower.
Describe the functions of a flower and how its structure relates to function
Describe how the flower forms pollen grains and ovules
Describe the processes of self- and cross-pollination
Describe the stages of fertilization, outline the process of fruit and seed formation.

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