BST:Reproduction in plant II

Lesson Note: Reproduction in Plants - Pollination and Fertilization

Class: BASIC 5 Subject: BST Topic: Reproduction in Plants Curriculum: Hybrid

Lesson Objectives:

1. Identify the parts of a flower concerned with pollination and fertilization.
2. Describe the stages of development from flower to fruit.
3. Distinguish between pollination and fertilization.

Introduction (10 minutes)

Welcome, students! Today, we're going to explore the fascinating world of plant reproduction. Plants have evolved unique strategies to reproduce, and understanding these processes is essential for appreciating the diversity of life on Earth. In this lesson, we'll focus on the crucial stages of pollination and fertilization, which ultimately lead to the formation of fruits and seeds.

Parts of a Flower Concerned with Pollination and Fertilization (20 minutes)

A flower is made up of several parts, each with a specific function. The parts concerned with pollination and fertilization are:

1. Petal: The colorful part of the flower that attracts pollinators like bees, butterflies, and hummingbirds.
2. Sepal: The green, leaf-like structure that protects the flower bud.
3. Stamen: The male reproductive organ, consisting of a filament and an anther. The anther produces pollen, which contains the male gametes (sperm cells).
4. Pistil: The female reproductive organ, consisting of a stigma, style, and ovary. The stigma receives pollen, while the ovary contains ovules (eggs) that will develop into seeds.

Stages of Development from Flower to Fruit (30 minutes)

The journey from flower to fruit involves several stages:

1. Pollination: The transfer of pollen from the anther to the stigma. This can occur through various means, such as wind, water, or animal pollinators.
2. Germination: The growth of the pollen tube from the pollen grain, which fertilizes the egg cell in the ovary.
3. Fertilization: The fusion of the male and female gametes, resulting in the formation of a zygote.
4. Embryogenesis: The development of the zygote into an embryo, which will eventually form a seed.
5. Fruit Formation: The ovary of the flower develops into a fruit, which contains the seeds.

Distinguishing between Pollination and Fertilization (20 minutes)

While often used interchangeably, pollination and fertilization are distinct processes:

• Pollination is the transfer of pollen from the anther to the stigma, which prepares the flower for fertilization.
• Fertilization is the actual fusion of the male and female gametes, resulting in the formation of a zygote.

Conclusion (10 minutes)

In conclusion, the processes of pollination and fertilization are crucial for plant reproduction. By understanding the parts of a flower concerned with these processes and the stages of development from flower to fruit, we can appreciate the complexity and beauty of plant life. Remember, pollination and fertilization are distinct processes that ultimately lead to the formation of fruits and seeds.

Assessment

• Identify and label the parts of a flower concerned with pollination and fertilization.
• Describe the stages of development from flower to fruit.
• Explain the difference between pollination and fertilization.

Extension

• Research and create a list of plants that rely on different types of pollinators (e.g., bees, butterflies, hummingbirds).
• Design and create a model of a flower, labeling its various parts.
• Observe and record the stages of fruit development in a plant of your choice.