Lesson Notes By Weeks and Term v3 - Primary 3
Soil
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Soil
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Subject: Basic Science
Class: Primary 3
Term: 2nd Term
Week: 3
Theme: Learning About Our Environment
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Watch on YouTubeMention the importance of soil to plants Mention the importance of soil to animals
that grows in the soil. A chicken might scratch the soil to find insects and worms to eat. Termites feed on wood, but their colonies are built from soil, and their presence helps break down dead plant material.
3. Source of Water: Explanation: Just as plants draw water from the soil, some small animals also access water retained within the soil, especially during dry seasons. Nigerian Context
Example: Small insects and amphibians like frogs, particularly those that spend time underground, can absorb moisture from damp soil.
4. Building Material: Explanation: Soil is used by various animals as a primary material for building structures. Nigerian Context
Example: Termites use soil mixed with saliva to construct their elaborate mounds. Certain mud wasps and even some birds (like swallows) use mud (wet soil) to build their nests. Traditional houses in some parts of Nigeria are built using mud bricks, demonstrating the strength of soil as a building material.
Definition of Soil: Soil is the loose upper layer of the Earth's surface, consisting of a mixture of organic matter (decayed plant and animal remains), minerals, water, and air. It is the natural medium in which plants grow.
Components of Soil (Briefly): For Primary 3, it is sufficient to explain that soil is not just 'dirt'.
It contains: Sand, Silt, and Clay: These are tiny rock particles of different sizes that give soil its texture.
Humus: Dark, organic material formed from decayed plants and animals. It makes soil fertile.
Water: Essential for plant growth and dissolving nutrients.
Air: Found in the spaces between soil particles, important for plant roots and soil organisms.
Living Organisms: Such as earthworms, insects, and microbes.
Importance of Soil to Plants:
1. Anchorage and Support: Explanation: Soil provides a firm base for plants to grow. Plant roots grow deep into the soil, holding the plant upright and preventing it from falling over, especially during strong winds or rain. Nigerian Context
Example: Imagine a tall yam plant or a maize stalk; its roots spread out in the soil, preventing it from toppling over. Without soil, these plants cannot stand erect and grow.
2. Source of Water: Explanation: Soil acts like a sponge, absorbing and holding water from rain or irrigation. Plant roots then absorb this water, which is essential for all their life processes, including photosynthesis (making food). Nigerian Context
Example: After rainfall, the soil in a farm absorbs the water. A cassava plant's roots draw this stored water from the soil, especially during dry periods, helping it to survive and grow its tubers.
3. Source of Nutrients: Explanation: Soil contains vital nutrients (like nitrogen, phosphorus, potassium) that plants need for healthy growth. These nutrients are absorbed by the roots along with water. Humus, the decayed organic matter in soil, is a rich source of these nutrients. Nigerian Context
Example: When a farmer applies compost or fertilizer to the soil for growing vegetables like ugu (fluted pumpkin) or tomatoes, they are adding more nutrients that the soil can provide to the plants, leading to better harvests.
4. Source of Air: Explanation: Just like humans and animals, plant roots need air (specifically oxygen) to breathe and grow properly. The spaces between soil particles hold air, making it available to the roots. Nigerian Context
Example: If soil becomes too compacted (hard and squashed), it reduces the air spaces, which can make it difficult for the roots of crops like rice or beans to breathe and thrive. That's why farmers sometimes loosen the soil.
Importance of Soil to Animals:
1. Habitat and Shelter: Explanation: Many animals live in or on the soil. Some animals burrow into the soil to build their homes (burrows, nests, tunnels) for shelter from predators, extreme weather (heat or cold), and to raise their young. Nigerian Context
Example: Earthworms live entirely within the soil, creating tunnels. Ants build colonies in the soil. Rodents like rats and rabbits dig burrows in the soil. Termites build large mounds of soil as their homes. These provide safety and a stable environment.
2. Source of Food (Directly and Indirectly): Explanation: Indirectly: Soil grows plants, and many animals (herbivores like goats, sheep, cows) eat these plants.
Therefore, soil indirectly provides food for a vast range of animals.
Directly: Some animals directly feed on organic matter in the soil (like earthworms eating decaying leaves) or other smaller organisms living in the soil (e.g., birds eating worms). Nigerian Context
Example: Goats graze on grass that grows in the soil. A chicken might scratch the soil to find insects and worms to eat. Termites feed on wood, but their colonies are built from soil, and their presence helps break down dead plant material.
3. Source of Water: Explanation: Just as plants draw water from the soil, some small animals also access water retained within the soil, especially during dry seasons. Nigerian Context
Example: Small insects and amphibians like frogs, particularly those that spend time underground, can absorb moisture from damp soil.
4. Building Material: Materials: A transparent container (e.g., clear plastic bottle, glass jar) with a soil sample. Pictures or charts showing different types of plants growing in soil (e.g., yam farm, maize farm, vegetable garden). Pictures or charts showing animals that live in or rely on soil (e.g., earthworm, ant colony, rabbit burrow, cow grazing). Drawing materials (crayons, paper). (Optional) A small potted plant or a seedling.
Teacher Activities: Introduction (5 minutes): Teacher begins by showing a soil sample in a transparent container and asking students: "What is this?" and "Where can we find it?" Teacher asks: "Do you think this soil is important? Why?" Teacher briefly states that today's lesson will help them understand just how important soil is to plants and animals.
Exploration and Discussion (10 minutes): Teacher displays pictures of different plants (e.g., yam, maize, mango tree) and animals (e.g., earthworm, goat, ant).
Teacher prompts questions: "Where do these plants grow?" "What do plants need to grow well?" "Where do some of these animals live?" "What do some animals eat?" Teacher guides a brief discussion, linking plants to soil for growth and animals to soil for food and shelter. Direct Instruction and Explanation (15 minutes): Teacher explains the "Importance of Soil to Plants" in detail, using the key concepts outlined above (anchorage, water, nutrients, air). Teacher points to the soil sample or pictures to illustrate each point. Teacher explains the "Importance of Soil to Animals" in detail, covering habitat, food, water, and building material. Teacher uses pictures of burrows, grazing animals, and termite mounds as examples. Teacher encourages students to share their own local examples.
Activity - Group Work (10 minutes): Teacher divides students into small groups.
Group Task 1: "List two ways soil is important to plants." Group Task 2: "List two ways soil is important to animals." Teacher moves around to assist and monitor group discussions.
Wrap-up and Review (5 minutes): Teacher asks groups to share their answers. Teacher summarises the main points of the lesson, reinforcing the importance of soil to both plants and animals. Teacher checks for understanding with a few quick questions (formative assessment).
Student Activities: Observe the soil sample and discuss its appearance. Answer questions about where plants grow and animals live. Listen attentively to the teacher's explanations. Participate in group discussions to list the importance of soil to plants and animals. Share their group's findings with the class. Answer quick questions during the review session.
Instructions for Teacher: Read out each question, allow students time to think or discuss in pairs, then guide them to the correct answer, explaining the reasoning.
Question 1: Why is soil important for a yam plant to grow tall and strong?
Solution: Soil is important for a yam plant to grow tall and strong because it provides anchorage or support. The roots of the yam plant grow deep into the soil, holding it firmly in place and preventing it from falling over.
Commentary: This question directly targets the "anchorage" aspect of soil's importance to plants, using a common Nigerian crop.
Question 2: Imagine a goat grazing in a field. How does the soil in that field help the goat get its food?
Solution: The soil in the field helps the goat get its food indirectly. Plants like grass and leaves grow in the soil because the soil provides them with water and nutrients. The goat then eats these plants, getting its food. So, without the soil, the plants wouldn't grow, and the goat wouldn't have food.
Commentary: This links soil to animal food sources via the plants that grow in it, a common real-world scenario.
Question 3: An earthworm lives underground. Why is the soil a good home for it?
Solution: The soil is a good home for an earthworm because it provides habitat and shelter. The earthworm can burrow into the soil to hide from birds (predators), stay safe from the hot sun or heavy rain, and find decaying organic matter to eat.
Commentary: This focuses on soil as a habitat for burrowing animals, using a specific example.
Question 4: A farmer observed that his maize plants were not growing well, even after it rained. He later found out the soil was very hard and packed. What important thing might be missing for the maize roots due to the hard soil?
Solution: If the soil is hard and packed, the maize roots might be missing air. Hard, compacted soil has very little space between its particles, which means there isn't enough air (oxygen) for the roots to breathe and grow properly.
Commentary: This challenges students to think about a specific function of soil (air supply) and a common problem in agriculture.
Agriculture and Food Security: The most direct application is in farming. Students learn that fertile soil is crucial for growing crops like yam, cassava, rice, and vegetables, which are staple foods in Nigeria. This knowledge helps them appreciate farmers' efforts and the source of their food. Soil quality directly impacts crop yield and food availability.
Animal Husbandry and Livestock: Soil supports the growth of grasses and other vegetation that livestock (goats, cows, sheep) graze on. Understanding this connection helps students see the link between healthy soil, healthy pastures, and healthy animals, which in turn provide meat, milk, and other products.
Environmental Awareness and Conservation: The lesson highlights that soil is home to many animals and provides essential resources. This can be extended to discuss the importance of protecting soil from erosion (e.g., during heavy rainfall in Nigerian communities) and pollution, which can harm plants and animals that depend on it. This promotes a sense of responsibility towards the local environment.