Lesson Notes By Weeks and Term v5 - Grade 5

Lesson Video

This page supports the lesson note with a companion video and a short classroom-ready summary.

For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.

Performance objectives

• Identify the main parts of a plant and explain their functions.
• Describe the processes of photosynthesis and pollination.
• Explain how animal body parts help them survive.
• Classify animals based on their diets.
• Explain the concept of a food chain and how energy flows through it.

Lesson summary

This week, we're going to revisit and strengthen our understanding of some important concepts we covered in Grade 5 Natural Sciences and Technology. Think of it as sharpening our tools before we tackle new challenges! We'll focus on topics related to plant and animal structures, processes, and how they interact with their environment. Understanding these basic concepts helps us appreciate the amazing biodiversity around us in South Africa and how we can protect it. For example, understanding how plants make food helps us understand why trees are so important for clean air and preventing soil erosion.

Lesson notes

2.1 Plant Parts and Their Functions Plants are vital for life on Earth! They provide us with food, oxygen, and shelter. Let’s look at the different parts of a plant and what each part does: Roots: Roots anchor the plant in the ground and absorb water and nutrients from the soil. Think of the roots like the foundations of your house; they keep the plant steady. Roots can be thin and branching (like those of a grass plant) or thick and strong (like the roots of a large tree). In South Africa, some plants, like certain succulents, have roots that are specifically adapted to store water to survive long dry periods.

Stem: The stem supports the plant and transports water and nutrients from the roots to the leaves. It's like the plumbing system in your house. Stems can be thin and flexible (like the stem of a flower) or thick and woody (like the trunk of a tree).

Leaves: Leaves are where photosynthesis takes place. They contain chlorophyll, a green pigment that captures sunlight, which the plant uses to make food (sugar) from water and carbon dioxide. Think of the leaves as the plant’s kitchen. Leaves come in different shapes and sizes, adapted to their environment. For example, some plants in very sunny areas have small leaves to reduce water loss, while plants in shady areas have broad leaves to capture as much sunlight as possible.

Flowers: Flowers are the reproductive parts of the plant. They are responsible for producing seeds, which grow into new plants. Flowers are often brightly coloured to attract insects or other animals that help with pollination. Some South African flowers, like the Protea, are famous for their unique beauty and attract specific pollinators. 2.2 Photosynthesis Photosynthesis is the process by which plants make their own food. It requires sunlight, water, and carbon dioxide. Chlorophyll in the leaves captures the sunlight's energy. Water is absorbed through the roots and transported to the leaves. Carbon dioxide is taken from the air through tiny pores on the leaves called stomata.

The process can be summarised as: Sunlight + Water + Carbon Dioxide → Sugar (Glucose) + Oxygen The sugar (glucose) provides the plant with energy to grow and develop. Oxygen is released into the atmosphere as a byproduct, which is what we breathe! 2.3 Pollination Pollination is the process of transferring pollen from the male part of a flower (the stamen) to the female part of a flower (the pistil). This is necessary for fertilization to occur, which leads to the formation of seeds.

Pollination can occur in several ways: Wind pollination: The wind carries pollen from one flower to another. These plants often have small, inconspicuous flowers.

Insect pollination: Insects, such as bees, butterflies, and flies, carry pollen from one flower to another. These plants often have brightly coloured, fragrant flowers to attract insects.

Animal pollination: Birds and other animals can also help to pollinate flowers. 2.4 Animal Body Parts and Adaptation Animals have different body parts that help them survive in their environment. These are called adaptations.

Some examples include: Camouflage: Animals like chameleons can change colour to blend in with their surroundings, which helps them to avoid predators or sneak up on prey.

Sharp claws and teeth: Lions have sharp claws and teeth to help them hunt and kill prey.

Long necks: Giraffes have long necks to reach leaves high up in trees.

Thick fur: Animals like the African wild dog have thick fur to keep them warm in cold climates. 2.5 Classifying Animals by Diet Animals can be classified based on what they eat: Herbivores: Herbivores are animals that eat only plants. Examples include cows, sheep, and giraffes.

Carnivores: Carnivores are animals that eat only meat (other animals). Examples include lions, leopards, and eagles.

Omnivores: Omnivores are animals that eat both plants and animals. Examples include pigs, chickens, and humans. 2.6 Food Chains A food chain shows how energy is transferred from one organism to another in an ecosystem. It always starts with a producer (usually a plant), which makes its own food through photosynthesis. The producer is then eaten by a consumer, which is an animal that eats other organisms. There can be multiple levels of consumers in a food chain.

For example: Grass → Grasshopper → Frog → Snake → Eagle In this food chain: The grass is the producer. The grasshopper is a primary consumer (herbivore). The frog is a secondary consumer (carnivore). The snake is a tertiary consumer (carnivore). The eagle is a quaternary consumer (carnivore). The arrow (→) shows the flow of energy from one organism to the next. Guided Practice (With Solutions)

Question 1: What is the function of roots in a plant?

Solution: The roots anchor the plant in the ground and absorb water and nutrients from the soil.

Commentary: This question tests basic recall of plant parts and functions.