PRIMARY 5: BASIC SCIENCE – SECOND TERM | WEEK 6

TOPIC: REPRODUCTION IN PLANTS II – POLLINATION AND FERTILIZATION

A: TEACHING AND LEARNING MATERIALS

1. Fresh flowers.
2. Diagrams of pollination and fertilization.
3. Pictures of insect- and wind-pollinated flowers.
4. Fruits and seeds.
5. Pupils’ notebooks and pencils.

B: REFERENCE MATERIALS

1. Scheme of work.
2. Recommended Basic Science textbook for Primary 5.
3. Online educational resources.

C: PREVIOUS KNOWLEDGE

The pupils have learnt the parts of a flower, their functions, the meaning of pollination and the difference between self-pollination and cross-pollination.

D: PERFORMANCE OBJECTIVES

By the end of the lesson, pupils should be able to:

1. Identify characteristics of insect-pollinated flowers.
2. Identify characteristics of wind-pollinated flowers.
3. Explain fertilization in flowering plants.
4. Describe what happens after fertilization.
5. Explain how seeds and fruits are formed.
6. Differentiate between pollination and fertilization.

E: CONTENT

Insect-Pollinated Flowers

Flowers pollinated by insects often have:

• Brightly coloured petals.
• Sweet smell.
• Nectar.
• Sticky pollen grains.

🐝 Insects visit these flowers and carry pollen from one flower to another.

Wind-Pollinated Flowers

Flowers pollinated by wind often have:

• Small or dull-coloured petals.
• Little or no scent.
• Light pollen grains.
• Exposed stamens and stigmas.

💨 Wind carries the pollen grains.

Meaning of Fertilization

Fertilization occurs when the male reproductive cell joins with the female reproductive cell inside the flower. Fertilization happens after successful pollination.

What Happens After Fertilization?

After fertilization:

1. The ovule develops into a seed.
2. The ovary develops into a fruit.

🍊 Fruit protects the seeds in many plants.

Pollination and Fertilization

Pollination is the transfer of pollen from anther to stigma. Fertilization is the joining of male and female reproductive cells.

F: LESSON PRESENTATION

F1: Teachers’ Activities

1. Revises pollination.
2. Displays pictures of insect- and wind-pollinated flowers.
3. Explains their characteristics.
4. Introduces fertilization.
5. Explains seed and fruit formation.
6. Compares pollination and fertilization.

F2: Pupils’ Activities

1. Recall the meaning of pollination.
2. Identify features of insect-pollinated flowers.
3. Identify features of wind-pollinated flowers.
4. Explain fertilization.
5. Examine fruits and seeds.
6. State differences between pollination and fertilization.

G: CONCLUSION

The teacher revises pollination, fertilization and the formation of seeds and fruits. Pupils are reminded that pollination comes before fertilization in flowering plants.

H: EVALUATION GUIDE

Pupils should be able to answer the following questions:

1. Mention three characteristics of insect-pollinated flowers.
2. Mention three characteristics of wind-pollinated flowers.
3. What is fertilization?
4. What does the ovule become after fertilization?
5. What does the ovary become?
6. State one difference between pollination and fertilization.